Method For Producing Hydroxy L Lysine And Hydroxy L Pipecolic Acid Using L Lysine Hydroxylase.
Abstract:
The present invention addresses the issue of providing a method whereby hydroxy -L- lysine can be efficiently produced. The present invention provides a production method for hydroxy- L- lysine, characterized by: causing a 2- oxoglutarate dependent L- lysine hydroxylase , cells including same, a preparation of said cells , or a culture fluid obtained by cultivating said cells, to act on L -lysine; and generating the hydroxy- L -lysine indicated in general formula (I) (in the formula , R1, R2, and R3 each indicate a hydrogen atom or a hydroxyl group and at least one among R1, R2 , and R3 indicates a hydroxyl group.)
Get Free WhatsApp Updates!
Notices, Deadlines & Correspondence
13 -4, Uchikanda 1- chome, Chiyoda- ku
Tokyo 1010047
Inventors
1. KINO, Kuniki
c/o WASEDA UNIVERSITY, 104, Totsukamachi 1-chome, Shinjuku-ku, Tokyo 1698050,
2. HARA, Ryotaro
c/o WASEDA UNIVERSITY, 104, Totsukamachi 1-chome, Shinjuku-ku, Tokyo 1698050,
3. MIYAKE, Ryoma
c/o MITSUBISHI CHEMICAL GROUP SCIENCE AND TECHNOLOGY RESEARCH CENTER, INC., 1000, Kamoshida-cho, Aoba-ku, Yokohama-shi, Kanagawa 2278502,
4. KAWABATA, Hiroshi
c/o MITSUBISHI CHEMICAL GROUP SCIENCE AND TECHNOLOGY RESEARCH CENTER, INC., 1000, Kamoshida-cho, Aoba-ku, Yokohama-shi, Kanagawa 2278502,
Specification
L-LYSINE HYDROXYLASE AND PRODUCTION METHOD FOR HYDROXYL-
LYSINE AND HYDROXY-L-PIPECOLIC ACID USFNG SAME
5 TECHNICAL FIELD
[0001]
The present invention relates to a method for producing hydroxy-L-lysine
using a novel lysine hydroxylase, and a method for producing hydroxy-L-pipecolic
acid using the resulting hydroxy-L-lysine.
10 BACKGROUND ART
[0002]
Hydroxy-L-lysine is an intermediate useful as an intermediate for
pharmaceuticals and the like. For example, it is known that (3i?)-hydroxy-L-lysine
can be used as a precursor of a protein kinase C inhibitor (-)-balanol (Non-patent
1 5 Document 1), and that (5ii!)-hydroxy-L-lysine can be used as a precursor of
Bengamide B, which has antitumor activity (Non-patent Document 2). Hydroxy-Llysine
is reported to be useful as a material of hydroxy-L-pipecolic acid (Non-patent
Documents 3 and 4). For example, (4i?)-hydroxy-L-pipecolic acid can be used as a
precursor of an HTV protease inhibitor palinavir (Non-patent Document 5), and (5S)-
20 hydroxy-L-pipecolic acid and (5i?)-hydroxy-L-pipecolic acid can be used as
precursors of antimicrobial agents (Patent Document 1).
Examples of reported methods for synthesizing hydroxy-L-lysine include a
method for synthesizing (3i?)-hydroxy-L-lysine by asymmetric hydrogenation using a
Ru catalyst (Non-patent Document 1).
25 Amino acid hydroxylases are useful enzymes for production of intermediates
for pharmaceuticals and the like, and proline 4-hydroxylase (Non-patent Document
6) and L-isoleucine dioxygenase (Non-patent Document 7) have been reported before
2
However, enzymes that act on L-lysine have not yet been reported.
PRIOR ART DOCUMENTS
[Patent Document]
[0003]
5 Patent Document 1: Japanese Translated PCT Patent Application Laid-open No.
2004-505088
[Non-patent Documents]
[0004]
Non-patent Document 1: Coulon et al., Tetrahedron Lett., 1998, 39, 6467
10 Non-patent Document 2: Kinder et al., J. Org. Chem., 2001, 66, 2118
Non-patent Document 3: Yasuda et al., Tetrahedron Asymm., 2006, 17, 1775
Non-patent Document 4: Tsotsou et al., Biochemie, 2007, 89, 591
Non-patent Document 5: Gillard et al., J. Org. Chem., 1996, 61, 2226
Non-patent Document 6: Shibasaki et al., Appl. Environ. Microbiol., 1999, 65, 4028
15 Non-patent Document 7: Hibi et al., Appl. Environ. Microbiol., 2011, 77, 6926
SUMMARY OF THE INVENTION
PROBLEMS TO BE SOLVED BY THE INVENTION
[0005]
In the synthesis method for hydroxy-L-lysine described in Non-patent
20 Document 1, preparation of the material is laborious, and the cost of preparation and
recycling of the catalyst is high. Therefore, a more efficient synthesis method has
been demanded.
An object of the present invention is to provide a novel, inexpensive, and
simple method for production of hydroxy-L-lysine having higher optical purity.
25 MEANS FOR SOLVING THE PROBLEMS
[0006]
In order to solve the above problems, the present inventors intensively studied
3
on a method for producing optically active hydroxy-L-lysine. As a result, the
inventors discovered that homologue proteins of L-arginine-P hydroxylase VioC,
whose isolation as proteins has not been reported so far and whose functions have
been unknown, have 2-oxoglutarate-dependent L-lysine hydroxylase activity. The
5 inventors also discovered that, by preparing a transformant using DNA encoding
each protein and allowing the transformed cell, a processed product thereof, and/or a
culture broth thereof to act on L-lysine, highly optically pure hydroxy-L-lysine can be
obtained at high concentration. In addition, the inventors discovered that hydroxy-
L-pipecolic acid can be produced using the resulting hydroxy-L-lysine. The present
10 invention was achieved based on these discoveries.
[0007]
That is, the present invention can be summarized as follows.
(1) A method for producing hydroxy-L-lysine, the method comprising allowing
2-oxoglutarate-dependent L-lysine hydroxylase, a cell containing 2-oxoglutarate-
15 dependent L-lysine hydroxylase, a processed product of the cell, and/or a culture
broth obtained by culturing the cell, to act on L-lysine to produce hydroxy-L-lysine
represented by the following General Formula (I):
[0008]
R3 R1 O
H2N ^ L J ^ J-v.
R2 NH2 (I)
20 [0009]
(wherein each of R1, R2 and R3 represents a hydrogen atom or hydroxyl group, with
the proviso that at least one of R1, R2 and R3 represents a hydroxyl group).
[0010]
(2) The method for producing hydroxy-L-lysine according to (1), wherein the 2-
4
oxoglutarate-dependent L-lysine hydroxylase comprises the polypeptide shown in the
following (A), (B), or (C):
(A) a polypeptide comprising the amino acid sequence of SEQ ID NO:2, 4, 6,
8, 10, or 12;
5 (B) a polypeptide comprising the amino acid sequence of SEQ ID NO:2, 4, 6,
8, 10, or 12 except that one or several amino acids are deleted, substituted, and/or
added, which polypeptide has 2-oxoglutarate-dependent L-lysine hydroxylase
activity; or
(C) a polypeptide comprising an amino acid sequence with an identity of not
10 less than 60% to the amino acid sequence of SEQ ID NO:2, 4, 6, 8, 10, or 12, which
polypeptide has 2-oxoglutarate-dependent L-lysine hydroxylase activity.
[0011]
(3) The method for producing hydroxy-L-lysine according to (1) or (2), wherein
the cell comprising 2-oxoglutarate-dependent L-lysine hydroxylase is a cell
15 transformed with a DNA encoding the 2-oxoglutarate-dependent L-lysine
hydroxylase.
[0012]
(4) The method for producing hydroxy-L-lysine according to (3), wherein the
DNA encoding 2-oxoglutarate-dependent L-lysine hydroxylase comprises the DNA
20 of the following (D), (E), or (F):
(D) DNA comprising the nucleotide sequence of SEQ ID NO: 1, 3, 5, 7, 9, or
i i;
(E) DNA comprising the nucleotide sequence of SEQ ID NO: 1, 3, 5, 7, 9, or
11 except that one or several nucleotides are substituted, deleted, and/or added,
25 which DNA encodes a polypeptide having 2-oxoglutarate-dependent L-lysine
hydroxylase activity; or
(F) DNA comprising a nucleotide sequence which hybridizes with the
5
complementary strand of the nucleotide sequence of SEQ ID NO: 1, 3, 5, 7, 9, or 11
under stringent conditions, which DNA encodes a polypeptide having 2-oxoglutaratedependent
L-lysine hydroxylase activity.
[0013]
5 (5) The method for producing hydroxy-L-lysine according to any one of (1) to (4),
wherein the 2-oxoglutarate-dependent L-lysine hydroxylase, cell containing the 2-
oxoglutarate-dependent L-lysine hydroxylase, processed product of the cell, and/or
culture broth obtained by culturing the cell, is/are allowed to act on the L-lysine in
the presence of 2-oxoglutaric acid and ferrous ion.
10 [0014]
(6) A method for producing hydroxy-L-pipecolic acid, the method comprising:
producing hydroxy-L-lysine by the production method according to any one
of(l)to(5);
allowing the resulting hydroxy-L-lysine to react with at least one enzyme
15 selected from the group consisting of L-amino acid oxidase, L-amino acid
dehydrogenase, and L-amino acid transferase, or with amino acid racemase and at
least one enzyme selected from the group consisting of D-amino acid oxidase, Damino
acid dehydrogenase, and D-amino acid transferase, to produce a compound
represented by the following General Formula (II):
20 [0015]
[OOiuj
(wherein R1, R2, and R3 have the same meanings as in General Formula (I)); and
6
allowing W-methyl-L-amino acid dehydrogenase to act on the resulting
compound to produce hydroxy-L-pipecolic acid represented by the following General
Formula (O):
[0017]
5
[0018]
(wherein R1, R2, and R3 have the same meanings as in General Formula (I)).
[0019]
(7) A method for producing hydroxy-L-pipecolic acid, the method comprising:
10 producing hydroxy-L-lysine by the production method according to any one
of (1) to (5);
allowing the resulting hydroxy-L-lysine to react with at least one enzyme
selected from the group consisting of L-lysine 6-oxidase, L-lysine 6-dehydrogenase,
and L-lysine 6-transferase, to produce a compound represented by the following
15 General Formula (rV):
[0020]
(wherein R1, R2, and R3 have the same meanings as in General Formula (I)); and
7
allowing pyrroline-5-carboxylate reductase to act on the resulting compound
to produce hydroxy-L-pipecolic acid represented by the following General Formula
(ED):
[0022]
[0023]
(wherein R1, R2, and R3 have the same meanings as in General Formula (I)).
[0024]
(8) A method for producing hydroxy-L-pipecolic acid, the method comprising:
10 producing hydroxy-L-lysine by the production method according to any one
of (1) to (5); and
allowing lysine cyclodeaminase to act on the resulting hydroxy-L-lysine to
produce hydroxy-L-pipecolic acid represented by the following General Formula
(ED):
15 [0025]
[0026]
(wherein R1, R2, and R3 have the same meanings as in General Formula (I)).
[0027]
8
(9) A 2-oxoglutarate-dependent L-lysine hydroxylase protein having activity to
act on L-lysine to produce hydroxy-L-lysine, and comprising the polypeptide of the
following (A), (B), or (C):
(A) a polypeptide comprising the amino acid sequence of SEQ ID NO:2, 4, 6,
5 8, 10, or 12;
(B) a polypeptide comprising the amino acid sequence of SEQ ID NO:2, 4, 6,
8, 10, or 12 except that one or several amino acids are deleted, substituted, and/or
added, which polypeptide has 2-oxoglutarate-dependent L-lysine hydroxylase
activity; or
10 (C) a polypeptide comprising an amino acid sequence with an identity of not
less than 60% to the amino acid sequence of SEQ ID NO:2, 4, 6, 8, 10, or 12, which
polypeptide has 2-oxoglutarate-dependent L-lysine hydroxylase activity.
EFFECT OF THE FNVENTION
[0028]
15 By the present invention, hydroxy-L-lysine can be efficiently produced, and
highly optically pure hydroxy-L-lysine can be obtained. From the resulting
hydroxy-L-lysine, highly optically pure hydroxy-L-pipecolic acid can be efficiently
produced.
BRIEF DESCRIPTION OF THE DRAWINGS
20 [0029]
Fig. 1 is a diagram illustrating conversion of L-lysine to 4-hydroxylysine by
Hyl-1,3, 4, or 5.
Fig. 2 is a diagram illustrating conversion of L-lysine to 3-hydroxylysine by
Hyl-2 or 6.
2 5 MODE FOR CARRYING OUT THE FNVENTION
[0030]
The present invention is described below in detail.
9
The method for producing hydroxy-L-lysine of the present invention
comprises allowing 2-oxoglutarate-dependent L-lysine hydroxylase, a cell containing
5 2-oxoglutarate-dependent L-lysine hydroxylase, a processed product of the cell,
and/or a culture broth obtained by culturing the cell, to act on L-lysine. As
described later, the method of the present invention is preferably carried out in the
presence of 2-oxoglutaric acid and ferrous ion.
Since the 2-oxoglutarate-dependent L-lysine hydroxylase used in the present
10 invention (hereinafter also referred to as "L-lysine hydroxylase of the present
invention") has high regioselectivity and stereoselectivity in hydroxylation of Llysine,
highly optically pure hydroxy-L-lysine can be efficiently obtained using it.
The L-lysine hydroxylase in the present invention is not limited as long as the
L-lysine hydroxylase has 2-oxoglutarate-dependent L-lysine hydroxylase activity.
1 5 Preferably, the L-lysine hydroxylase has the amino acid sequence of SEQ ID NO:
2,4,6,8,10, or 12, or is a homologue of the amino acid sequence having 2-
oxoglutarate-dependent L-lysine hydroxylase activity. That is, the L-lysine
hydroxylase of the present invention preferably comprises the polypeptide of the
following (A), (B), or (C):
20 (A) a polypeptide comprising the amino acid sequence of SEQ ID NO:2, 4, 6,
8, 10, or 12;
(B) a polypeptide comprising the amino acid sequence of SEQ ID NO:2, 4, 6,
8, 10, or 12 except that one or several amino acids are deleted, substituted, and/or
added, which polypeptide has 2-oxoglutarate-dependent L-lysine hydroxylase
25 activity; or
(C) a polypeptide comprising an amino acid sequence with an identity of not
less than 60% to the amino acid sequence of SEQ ID NO:2, 4, 6, 8, 10, or 12, which
10
polypeptide has 2-oxoglutarate-dependent L-lysine hydroxylase activity.
[0031]
Examples of the homologue of 2-oxoglutarate-dependent L-lysine
hydroxylase comprising the amino acid sequence of SEQ ID NO: 2,4,6,8,10, or 12
5 which can be used in the present invention include, as described above in (B), a
polypeptide comprising the amino acid sequence of SEQ ID NO:2, 4, 6, 8, 10, or 12
except that one or several amino acids are deleted, substituted, and/or added as long
as the polypeptide retains 2-oxoglutarate-dependent L-lysine hydroxylase activity.
The term "one or several amino acids" herein means, for example, 1 to 100,
10 preferably 1 to 50, more preferably 1 to 20, still more preferably 1 to 10, especially
preferably 1 to 5, amino acids.
[0032]
As described above in (C), the homologue may also be a protein with a
sequence identity of at least not less than 60%, preferably not less than 80%, more
15 preferably not less than 90%, still more preferably not less than 95% to the entire
amino acid sequence of SEQ ID NO:2, 4, 6, 8, 10, or 12 as long as the protein has 2-
oxoglutarate-dependent L-lysine hydroxylase activity.
[0033]
In the present description, the 2-oxoglutarate-dependent L-lysine hydroxylase
20 activity means activity that adds a hydroxyl group to the carbon atom(s) at the 3-
position, 4-position, and/or 5-position of L-lysine in a 2-oxoglutarate-dependent
manner. Such activity can be confirmed by allowing the protein of interest, a cell
expressing the protein, and/or a processed product of the cell to act as an enzyme in a
reaction system comprising L-lysine as a substrate and 2-oxoglutaric acid as a
25 coenzyme, and then measuring production of hydroxy-L-lysine as described below in
the Examples.
[0034]
11
The amino acid sequences of 2,4,6,8,10, and 12 are based on the genomic
information ofFlavobacterium johnsoniae UW101 strain, Kineococcus
radiotolerans SRS30216 strain, Chitinophagapinensis DSM2588 strain,
Chryseobacterium gleum ATCC35910 strain, Niastella koreensis GR20-10 strain,
5 and marine actinobacterium PHSC20C1, respectively.
The amino acid sequences of 2,4,6,8,10, and 12 are identical to GenBank
accession Nos. ABQ06186, ABS05421, ACU60313, EFK34737, AEV99100, and
EAR24255, respectively, which are amino acid sequences translated from DNA
sequences predicted to encode proteins. None of these amino acid sequences have
10 been reported to actually exist based on, for example, isolation of the proteins, and
their protein functions have been totally unknown.
[0035]
Since the L-lysine hydroxylases of the present invention comprising the
amino acid sequence of SEQ ID NO:2, 6, 8, or 10 hydroxylate the 4-position of L-
1 5 lysine, (2S,4R) hydroxy L-lysine can be produced thereby. Among these sequences,
SEQ ID NO:8 is preferred because of high yield.
Since the L-lysine hydroxylases of the present invention comprising the
amino acid sequence of SEQ ID NO:4 or 12 hydroxylate the 3-position of L-lysine,
(2S,3S) hydroxy L-lysine can be produced thereby. Among these sequences, SEQ
20 ID NO: 12 is preferred because of high yield.
In the production method of the present invention, a plurality of 2-
oxoglutarate-dependent L-lysine hydroxylases may be used in combination.
[0036]
A 2-oxoglutarate-dependent L-lysine hydroxylase which can be used in the
25 present invention can be obtained by purification from Flavobacterium johnsoniae,
Kineococcus radiotolerans, Chitinophaga pinensis, Chryseobacterium gleum,
Niastella koreensis, or marine actinobacterium, and can also be obtained by cloning
12
of DNA encoding 2-oxoglutarate-dependent L-lysine hydroxylase using a known
method such as PCR or hybridization, followed by allowing expression of the
enzyme in an appropriate host.
[0037]
5 Examples of the DNA encoding 2-oxoglutarate-dependent L-lysine
hydroxylase comprising the amino acid sequence of SEQ ID NO:2, 4, 6, 8, 10, or 12
include DNAs comprising the nucleotide sequence of SEQ ID NO: 1, 3, 5, 7, 9, or 11,
respectively, and the DNA encoding 2-oxoglutarate-dependent L-lysine hydroxylase
may be a homologue of DNA comprising the nucleotide sequence of SEQ ID NO: 1,
10 3,5, 7, 9, or 11 as long as the homologue encodes a protein having 2-oxoglutaratedependent
L-lysine hydroxylase activity. That is, examples of the DNA encoding
the L-lysine hydroxylase of the present invention include the nucleotide sequences
shown in the following (D), (E), and (F).
(D) DNA comprising the nucleotide sequence of SEQ ID NO: 1, 3, 5, 7, 9, or
15 11;
(E) DNA comprising the nucleotide sequence of SEQ ID NO: 1, 3, 5, 7, 9, or
11 except that one or several nucleotides are substituted, deleted, and/or added,
which DNA encodes a polypeptide having 2-oxoglutarate-dependent L-lysine
hydroxylase activity; or
20 (F) DNA comprising a nucleotide sequence which hybridizes with the
complementary strand of the nucleotide sequence of SEQ ID NO: 1, 3, 5, 7, 9, or 11
under stringent conditions, which DNA encodes a polypeptide having 2-oxoglutaratedependent
L-lysine hydroxylase activity.
[0038]
25 As described in (E), examples of the homologue include homologues
comprising the nucleotide sequence of SEQ ID NO: 1, 3, 5, 7, 9, or 11 except that one
or several nucleotides are substituted, deleted, and/or added. The term "one or
13
several nucleotides" herein means, for example, 1 to 300, preferably 1 to 150, more
preferably 1 to 60, still more preferably 1 to 30, especially preferably 1 to 15,
nucleotides.
[0039]
5 As described in (F), the DNA homologue may be a DNA which hybridizes
with the complementary strand of the nucleotide sequence of SEQ ID NO: 1, 3, 5, 7, 9,
or 11 under stringent conditions as long as the DNA homologue encodes a protein
having 2-oxoglutarate-dependent L-lysine hydroxylase activity. Examples of the
"stringent conditions" herein include conditions under which washing is carried out
10 with0.1xSSCand0.1%SDSat60°C
[0040]
Those skilled in the art can obtain the DNA homologue described above by
introducing, as appropriate, a substitution, deletion, insertion, and/or addition
mutation(s) to the DNA of SEQ ID NO: 1, 3, 5, 7, 9, or 11 by site-specific
1 5 mutagenesis (Nucleic Acids Res. 10, pp. 6487 (1982), Methods in Enzymol. 100, pp.
448 (1983), Molecular Cloning, PCR A Practical Approach IRL Press pp. 200
(1991)) or the like.
[0041]
It is also possible to obtain amino acid information of 2-oxoglutarate-
20 dependent L-lysine hydroxylase activity or nucleotide sequence information of DNA
encoding it, by carrying out homology search using the amino acid sequence of SEQ
ID NO:2, 4, 6, 8, 10, or 12 or part thereof, or the nucleotide sequence of SEQ ID
NO: 1, 3, 5, 7, 9, or 11 or part thereof against a database such as DNA Databank of
JAPAN (DDBJ).
25 [0042]
In the method for producing hydroxy-L-lysine of the present invention, 2-
oxoglutarate-dependent L-lysine hydroxylase may be directly used for the reaction,
14
but it is preferred to use a cell containing 2-oxoglutarate-dependent L-lysine
hydroxylase, a processed product thereof, and/or a culture broth obtained by culturing
the cell.
The cell containing 2-oxoglutarate-dependent L-lysine hydroxylase may be a
5 cell such as a microorganism which inherently has 2-oxoglutarate-dependent L-lysine
hydroxylase, but it is preferred to use a cell such as a microorganism transformed
with a gene encoding 2-oxoglutarate-dependent L-lysine hydroxylase. The cell may
be either a dead cell or live cell, and, for example, a resting cell or the like may be
preferably used.
10 [0043]
Examples of the processed product of the cell containing 2-oxoglutaratedependent
L-lysine hydroxylase include: processed cell products such as products
prepared by treatment with an organic solvent, for example, acetone,
dimethylsulfoxide (DMSO), or toluene, products prepared by treatment with a
15 surfactant, products prepared by lyophilization, and products prepared by physical or
enzymatic disruption; products prepared by extracting an enzyme fraction from the
cell as a crude product or purified product; and products prepared by immobilizing
any of these products on a carrier such as polyacrylamide gel, carrageenan gel, or the
like.
20 Examples of the culture broth obtained by culturing the cell containing 2-
oxoglutarate-dependent L-lysine hydroxylase include a suspension of the cell in a
liquid medium, and, in cases where the cell is a secretory expression cell, examples
of the culture broth include the supernatant obtained by removing the cell by
centrifugation or the like, and a concentrate of the supernatant.
25 [0044]
By inserting the thus isolated DNA encoding 2-oxoglutarate-dependent Llysine
hydroxylase into a known expression vector such that expression of the
15
enzyme is possible, a 2-oxoglutarate-dependent L-lysine hydroxylase expression
vector can be provided. By transforming a host cell with this expression vector, a
transformant in which the DNA encoding 2-oxoglutarate-dependent L-lysine
hydroxylase is introduced can be obtained. The transformant can also be obtained
5 by incorporating the DNA encoding 2-oxoglutarate-dependent L-lysine hydroxylase
into the chromosomal DNA of a host by homologous recombination or the like such
that expression of the enzyme is possible.
[0045]
Specific examples of the method for preparing the transformant include a
10 method in which the DNA encoding 2-oxoglutarate-dependent L-lysine hydroxylase
is introduced into a plasmid vector, phage vector, or virus vector which can be stably
present in a host cell such as a microorganism, and the constructed expression vector
is then introduced into the host cell, or a method in which the DNA is directly
introduced into the host genome, and the genetic information is then transcribed and
15 translated. In this process, an appropriate promoter is preferably linked to 5'-
upstream of the DNA, and, in addition, an appropriate terminator is more preferably
linked to 5'-downstream of the DNA in the host. Such a promoter and terminator
are not limited as long as the promoter and the terminator are known to function in
the cell to be used as the host. For example, "Fundamental Microbiology 8: Genetic
20 Engineering, KYORITSU SHUPPAN CO., LTD." describes details of vectors,
promoters, and terminators that can be used in host microorganisms.
[0046]
The host microorganism to be transformed for expression of 2-oxoglutaratedependent
L-lysine hydroxylase is not limited as long as the host itself does not
25 adversely affect the reaction of L-lysine, and specific examples of the host
microorganism include the following microorganisms:
[0047]
16
bacteria belonging to the genera Escherichia, Bacillus, Pseudomonas,
Serratia, Brevibacterium, Corynebacterium, Streptococcus, Lactobacillus, and the
like whose host vector systems have been established;
[0048]
5 actinomycetes belonging to the genera Rhodococcus, Streptomyces, and the
like whose host vector systems have been established;
[0049]
yeasts belonging to the genera Saccharomyces, Kluyveromyces,
Schizosaccharomyces, Zygosaccharomyces, Yarrow ia, Trichosporon,
10 Rhodosporidium, Hansenula, Pichia, Candida, and the like whose host vector
systems have been established; and
[0050]
molds belonging to the genera Neurospora, Aspergillus, Cephalosporium,
Trichoderma, and the like whose host vector systems have been established.
15 [0051]
The procedure for construction of the transformant, the method for
construction of a recombinant vector suitable for the host, and the method for
culturing the host can be carried out according to techniques commonly used in the
fields of molecular biology, bioengineering, and genetic engineering (for example,
20 methods described in Molecular Cloning).
[0052]
The following are examples of preferred host microorganisms, and preferred
examples of the method of transformation, vector, promoter, terminator, and the like
for each microorganism. The present invention is not limited by these examples.
25 [0053]
For the genus Escherichia, especially Escherichia coli, examples of the
plasmid vector include pBR and pUC plasmids, and examples of the promoter
17
include promoters derived from lac (P-galactosidase), trp (tryptophan operon), tac, trc
(fusion of lac and trp), and X phage PL and PR. Examples of the terminator include
terminators derived from trpA, phages, and rrnB ribosomal RNA.
[0054]
5 For the genus Bacillus, examples of the vector include pUBl 10 plasmids and
pC194 plasmids. Integration into the chromosome is also possible. Examples of
the promoter and the terminator include those of genes of enzymes such as alkaline
protease, neutral protease, and a-amylase.
[0055]
10 For the genus Pseudomonas, examples of the vector include common host
vector systems established in Pseudomonasputida, Pseudomonas cepacia, and the
like; and a wide-host-range vector (containing genes required for autonomous
replication derived from RSF1010 and the like) pKT240, which is based on a
plasmid involved in degradation of toluene compounds, TOL plasmid (Gene, 26,
15 273-82(1983)).
[0056]
For the genus Brevibacterium, especially Brevibacterium lactofermentum,
examples of the vector include plasmid vectors such as pAJ43 (Gene 39, 281 (1985)).
Examples of the promoter and the terminator include promoters and terminators used
20 mE. coli.
[0057]
For the genus Corynebacterium, especially Corynebacterium glutamicum,
examples of the vector include plasmid vectors such as pCSl 1 (JP 57-183799 A) and
pCBlOl (Mol. Gen. Genet. 196, 175 (1984)).
25 [0058]
For Saccharomyces, especially Saccharomyces cerevisiae, examples of the
vector include YRp, YEp, YCp, and Yip plasmids. Examples of promoters and
18
terminators which may be used include those of the genes of enzymes such as alcohol
dehydrogenase, glyceraldehyde-3-phosphate dehydrogenase, acid phosphatase, Pgalactosidase,
phosphoglycerate kinase, and enolase.
[0059]
5 For the genus Schizosaccharomyces, examples of the vector include the
plasmid vector derived from Schizosaccharomycespombe described in Mol. Cell.
Biol. 6, 80 (1986). In particular, pAUR224 is commercially available from Takara
Shuzo Co., Ltd., and can be easily used.
[0060]
10 In terms of the genus Aspergillus, Aspergillus niger, Aspergillus oryzae and
the like are the best-studied species among molds. Plasmids, and integration into
the chromosome are applicable to these species, and promoters for extracellular
protease and amylase can be used (Trends in Biotechnology 7, 283-287 (1989)).
[0061]
15 Host vector systems other than the above-described systems have also been
established for various microorganisms, and those systems may be used as
appropriate.
Various host/vector systems have been established for plants and animals, in
addition to microorganisms. In particular, systems for allowing expression of a
20 large amount of foreign protein in an animal such as an insect (e.g., silkworm)
(Nature 315,592-594 (1985)), or in a plant such as rapeseed, maize, or potato; and
systems based on cell-free protein synthesis systems such as E. coli cell-free extracts
and wheat germs; have been established, and may be preferably used.
[0062]
25 In the production method of the present invention, 2-oxoglutarate-dependent
L-lysine hydroxylase, a cell containing the enzyme, a processed product of the cell,
and/or a culture broth obtained by culturing the cell, is/are allowed to act on a
19
reaction substrate L-lysine in the presence of 2-oxoglutaric acid, to produce hydroxy-
L-lysine represented by the following General Formula (I):
[0063]
R3 R1 O
(I)
[0064]
(wherein each of R1, R2 and R3 represents a hydrogen atom or hydroxyl group, with
the proviso that at least one of R1, R2 and R3 represents a hydroxyl group).
R1, R2 and R3 in the General Formula (I) may be selected in consideration of
the compound which is to be finally obtained. In particular, one or two of R1, R2
10 and R3 is/are preferably a hydroxyl group(s), and one ofR1,R2andR3 is more
preferably a hydroxyl group.
[0065]
The production method of the present invention is not limited as long as 2-
oxoglutaric acid; and 2-oxoglutarate-dependent L-lysine hydroxylase, a cell
15 containing the enzyme, a processed product of the cell, and/or a culture broth
obtained by culturing the cell; can be allowed to act on L-lysine. The method is
normally preferably carried out in an aqueous medium, or a mixture of the aqueous
medium and an organic solvent. The method of the present invention is more
preferably carried out in the presence of ferrous ion.
20 Examples of the aqueous medium include water and buffers.
Examples of the organic solvent include those in which the reaction substrate
is highly soluble, such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, tertbutanol,
acetone, and dimethyl sulfoxide. Other examples of the organic solvent
include ethyl acetate, butyl acetate, toluene, chloroform, and n-hexane, which are
20
effective for removal of reaction by-products and the like.
[0066]
The reaction substrate L-lysine is usually used at a substrate concentration
within the range of 0.01% w/v to 90% w/v, preferably 0.1% w/v to 30% w/v. The
5 reaction substrate may be added at once when the reaction is started, but is preferably
added continuously or intermittently in view of reducing an effect of substrate
inhibition of the enzyme, if any, and increasing the concentration of the product
accumulated.
The number of moles of the 2-oxoglutaric acid required for the reaction is
10 normally equivalent to, or higher than, that of the substrate, preferably equivalent to,
or up to 1.2-fold higher than, that of the substrate. The 2-oxoglutaric acid may be
added at once when the reaction is started, but is preferably added continuously or
intermittently in view of reducing an inhibitory action on the enzyme, if any, and
increasing the concentration of the product accumulated. Alternatively, an
15 inexpensive compound that can be metabolized by the host, such as glucose, may be
added instead of 2-oxoglutaric acid to allow metabolism of the compound by the host,
and 2-oxoglutaric acid produced during this process may be used for the reaction.
The production method of the present invention is preferably carried out in
the presence of ferrous ion. The ferrous ion is preferably used within the range of
20 usually 0.01 mM to 100 mM, preferably 0.1 mM to 10 mM. The ferrous ion may be
added as iron sulfate or the like at once when the reaction is started. Further
addition of the ferrous ion during the reaction is also effective when the ferrous ion
added was oxidized into ferric ion, or decreased due to formation of precipitation.
In cases where the L-lysine hydroxylase, cell containing the enzyme, processed
25 product of the cell, and/or culture broth obtained by culturing the cell, in the present
invention already contain(s) a sufficient amount of ferrous ion, the addition of the ion
is not necessarily required.
21
The reaction is carried out at a reaction temperature of usually 4°C to 60°C,
preferably 10°C to 45°C, at a pH of usually 3 to 11, preferably 5 to 8. The reaction
time is usually about 1 hour to about 72 hours.
[0067]
5 The amount of the cell and/or processed product of the cell to be added to the
reaction mixture is as follows. In cases where the cell is added, the cell
concentration is usually about 0.1% w/v to about 50% w/v, preferably 1% w/v to
20%) w/v in terms of the wet cell weight, and, in cases where the processed product
such as an enzyme is used, the specific activity of the enzyme is determined, and the
10 processed product is added in an amount equivalent to the cell concentration
described above.
[0068]
The hydroxy-L-lysine produced by the production method of the present
invention can be purified, after the reaction, by separating cells, proteins, and the like
15 in the reaction mixture by centrifugation, membrane treatment, and/or the like, and
then performing an appropriate combination of methods such as extraction with an
organic solvent(s), for example, 1-butanol and/or tert-butanol; distillation; column
chromatography using an ion-exchange resin(s), silica gel, and/or the like; isoelectric
crystallization; and/or crystallization with monohydrochloride, dihydrochloride,
20 and/or calcium salt.
[0069]
The hydroxy-L-lysine produced by the method for the present invention can
be used for production of hydroxy-L-pipecolic acid.
25 Examples of the method for producing hydroxy-L-pipecolic acid from
hydroxy-L-lysine include the 3 kinds of methods described below.
[0070]
22
The first method of the present invention for producing hydroxy-L-pipecolic
acid from hydroxy-L-lysine is as follows.
A method for producing hydroxy-L-pipecolic acid, which method comprises:
allowing hydroxy-L-lysine to react with at least one enzyme selected
5 from the group consisting of L-amino acid oxidase, L-amino acid dehydrogenase, and
L-amino acid transferase, or with amino acid racemase and at least one enzyme
selected from the group consisting of D-amino acid oxidase, D-amino acid
dehydrogenase, and D-amino acid transferase, to produce a cyclic amino acid having
a double bond at the 1-position represented by General Formula (II); and
10 allowing W-methyl -L-amino acid dehydrogenase to act on the resulting cyclic
amino acid having a double bond at the 1-position to produce hydroxy-L-pipecolic
acid represented by the following General Formula (ID):
[0071]
15 (wherein each of R1, R2 and R3 represents a hydrogen atom or hydroxyl group, with
the proviso that at least one of R1, R2 and R3 represents a hydroxyl group).
[0072]
The method is described below by way of exemplary schemes.
[0073]
[0074]
Scheme 1-1 uses A'-methyl-L-amino acid dehydrogenase and at least one
5 enzyme selected from the group consisting of L-amino acid oxidase, L-amino acid
dehydrogenase, and L-amino acid transferase (wherein, in the formula, each of R1, R2
and R3 represents a hydrogen atom or hydroxyl group, with the proviso that at least
one of R1, R2 and R3 represents a hydroxyl group).
[0075]
10 First, using the enzyme(s) selected from the group consisting of L-amino acid
oxidase, L-amino acid dehydrogenase, and L-amino acid transferase, the compound
(a) (hydroxy-L-lysine) is converted to the compound (b). This is followed by
spontaneous conversion of the compound (b) to the compound (c). Subsequently,
the compound (c) is converted to the compound (d) (hydroxy-L-pipecolic acid) by iV-
1 5 methyl-L-amino acid dehydrogenase (NMAADH).
[0076]
The L-amino acid oxidase herein is not limited as long as the L-amino acid
oxidase can catalyze a reaction in which the amino group at the 2-position of
hydroxy-L-lysine is converted to an oxo group. Examples of the L-amino acid
20 oxidase include proteins comprising the amino acid sequence of SEQ ID NO:26, and
proteins comprising an amino acid sequence with an identity of not less than 80%,
24
preferably not less than 90%, more preferably not less than 95% to SEQ ID NO:26,
while retaining the activity.
[0077]
The L-amino acid dehydrogenase is not limited as long as the L-amino acid
5 dehydrogenase can catalyze a reaction in which the amino group at the 2-position of
hydroxy-L-lysine is converted to an oxo group. Examples of the L-amino acid
dehydrogenase include the protein described in Nature, 1966, 211, 854.
[0078]
The L-amino acid transferase (L-amino acid aminotransferase) is not limited
10 as long as the L-amino acid transferase can catalyze a reaction in which the amino
group at the 2-position of hydroxy-L-lysine is converted to an oxo group. Examples
of the L-amino acid transferase include proteins comprising the amino acid sequence
described in Eur. J. Biochem., 1998, 254, 347, and proteins comprising an amino
acid sequence with an identity of not less than 80%, preferably not less than 90%,
15 more preferably not less than 95% to the amino acid sequence, while retaining the
activity.
[0079]
The iV-m ethyl -L-amino acid dehydrogenase is not limited as long as the Nmethyl-
L-amino acid dehydrogenase can catalyze a reaction in which the compound
20 of General Formula (II) is converted to hydroxy-L-pipecolic acid. Examples of the
iV-methyl -L-amino acid dehydrogenase include proteins comprising the amino acid
sequence of SEQ ID NO:24, and proteins comprising an amino acid sequence with an
identity of not less than 80%, preferably not less than 90%, more preferably not less
than 95% to SEQ ID NO:24, while retaining the activity.
25 [0080]
[UU01J
Scheme 1-2 uses amino acid racemase, 7V-methyl-L-amino acid
dehydrogenase, and at least one enzyme selected from the group consisting of D-
5 amino acid oxidase, D-amino acid dehydrogenase, and D-amino acid transferase
(wherein, in the formula, each of R1, R2 and R3 represents a hydrogen atom or
hydroxyl group, with the proviso that at least one of R1, R2 and R3 represents a
hydroxyl group).
[0082]
10 First, the compound (a) (hydroxy-L-lysine) is converted to the D-isomer
compound (a') (hydroxy-D-lysine) by amino acid racemase, and the compound (a') is
then converted to the compound (b) by an enzyme(s) selected from the group
consisting of D-amino acid oxidase, D-amino acid dehydrogenase, and D-amino acid
transferase. This is followed by spontaneous conversion of the compound (b) to the
1 5 compound (c). The compound (c) is then converted to the compound (d) (hydroxy-
L-pipecolic acid) by iV-methyl-L-amino acid dehydrogenase (NMAADH).
[0083]
The amino acid racemase is not limited as long as the amino acid racemase
can catalyze a reaction in which hydroxy-L-lysine is converted to hydroxy-D-lysine.
20 Examples of the amino acid racemase include proteins comprising the amino acid
sequence of SEQ ID NO:30, and proteins comprising an amino acid sequence with an
26
identity of not less than 80%, preferably not less than 90%, more preferably not less
than 95% to SEQ ID NO:30, while retaining the activity.
[0084]
The D-amino acid oxidase is not limited as long as the D-amino acid oxidase
5 can catalyze a reaction in which the amino group at the 2-position of hydroxy-Dlysine
is converted to an oxo group. Examples of the D-amino acid oxidase include
proteins comprising the amino acid sequence described in Biochemistry, 2005, 70, 40,
and proteins comprising an amino acid sequence with an identity of not less than
80%), preferably not less than 90%, more preferably not less than 95% to the amino
10 acid sequence, while retaining the activity.
[0085]
The D-amino acid dehydrogenase is not limited as long as the D-amino acid
dehydrogenase can catalyze a reaction in which the amino group at the 2-position of
hydroxy-D-lysine is converted to an oxo group. Examples of the D-amino acid
15 dehydrogenase include DauA described in Microbiology, 2010, 156(Pt 1), 60 and
Proc. Natl. Acad. Sci. U. S. A., 2009, 106, 906, and proteins comprising an amino
acid sequence with an identity of not less than 80%>, preferably not less than 90%,
more preferably not less than 95% to the amino acid sequence of DauA, while
retaining the activity.
20 [0086]
The D-amino acid transferase (D-amino acid aminotransferase) is not limited
as long as the D-amino acid transferase can catalyze a reaction in which the amino
group at the 2-position of hydroxy-D-lysine is converted to an oxo group.
Examples of the D-amino acid transferase include D-AAT described in Protein Eng,
25 1998, 11, 53, and proteins comprising an amino acid sequence with an identity of not
less than 80%, preferably not less than 90%, more preferably not less than 95% to DAAT,
while retaining the activity.
27
[0087]
The W-methyl-L-amino acid dehydrogenase is not limited as long as the Wmethyl-
L-amino acid dehydrogenase catalyzes a reaction in which the compound of
General Formula (II) is converted to hydroxy-L-pipecolic acid. Examples of the W-
5 methyl-L-amino acid dehydrogenase include proteins comprising the amino acid
sequence of SEQ ID NO:24, and proteins comprising an amino acid sequence with an
identity of not less than 80%, preferably not less than 90%, more preferably not less
than 95% to SEQ ID NO:24, while retaining the activity.
[0088]
10 In each of Scheme 1-1 and Scheme 1-2, the enzymatic reactions may be
carried out separately, but the reactions are preferably carried out continuously in a
single reaction system.
More preferably, the reactions are carried out by allowing cells containing the
enzymes which catalyze the reactions to react with hydroxy-L-lysine. Although the
1 5 cells containing the enzymes which catalyze the reactions may be microorganism
cells intrinsically having these enzymes, it is preferred to use cells transformed with
DNA encoding the enzymes. In Scheme 1-1, the cells to be used are preferably cells
transformed with DNA encoding at least one enzyme selected from the group
consisting of L-amino acid oxidase, L-amino acid dehydrogenase, and L-amino acid
20 transferase, and DNA encoding iV-methyl-L-amino acid dehydrogenase. In Scheme
1-2, the cells to be used are preferably cells transformed with DNA encoding at least
one enzyme selected from the group consisting of D-amino acid oxidase, D-amino
acid dehydrogenase, and D-amino acid transferase, DNA encoding amino acid
racemase, and DNA encoding iV-methyl -L-amino acid dehydrogenase.
25 [0089]
The cells may be prepared by incorporating each of these DNAs into the
chromosome; by introducing these DNAs into a single vector and then transforming
28
the host with the single vector; or by separately introducing the DNAs into vectors
and then transforming the host with these vectors.
[0090]
The method for transformation of the host cells such as microorganism cells,
5 the type of the host, and the like are the same as those described in the 2-
oxoglutarate-dependent L-lysine hydroxylase section.
[0091]
Since W-methyl-L-amino acid dehydrogenase requires NAD(P)H as a coenzyme,
an NAD(P)H-regenerating system is preferably allowed to coexist. That is,
10 in cases where the NAD(P)H is added, NAD(P)+ generated from the NAD(P)H is
preferably regenerated into NAD(P)H from the viewpoint of increasing the
production efficiency. Examples of the regeneration method include: 1) a method
in which the NAD(P)+-reducing capacity of the host microorganism itself is used; 2)
a method in which a microorganism(s) having a capacity to generate NAD(P)H from
15 NAD(P)+, a processed product(s) thereof, and/or an enzyme (s) (regenerating
enzyme(s)) which can be used for regeneration of NAD(P)H, such as glucose
dehydrogenase, formate dehydrogenase, alcohol dehydrogenase, amino acid
dehydrogenase, and/or organic acid dehydrogenase (for example, malate
dehydrogenase), is/are added to the reaction system; and 3) a method in which, in
20 production of the transformant, one or more of the genes of the regenerating enzymes
which can be used for the regeneration of NAD(P)H is introduced into the host
together with the DNA in the present invention.
[0092]
In particular, in the method 1), glucose, ethanol, formic acid, and/or the like
25 is/are preferably added to the reaction system.
Examples of microorganisms/processed products/enzymes which may be used
in the method 2) include microorganisms containing the regenerating enzymes;
29
processed products of these microorganisms such as acetone-treated products,
lyophilized products, and physically or enzymatically disrupted products; fractions of
the enzymes extracted as crude products or purified products; and products prepared
by immobilizing any of these products on a carrier such as polyacrylamide gel,
5 carrageenan gel, or the like. Alternatively, a commercially available enzyme(s) may
be used. In such cases, addition of one or more of compounds to be used as
substrates for the regenerating enzymes, such as glucose in cases of use of glucose
dehydrogenase, formic acid in cases of use of formate dehydrogenase, and ethanol or
isopropanol in cases of use of alcohol dehydrogenase, is necessary.
10 [0093]
In cases where the reactions of Scheme 1-1 or Scheme 1-2 are continuously
carried out in a single reaction system, the scheme is preferably carried out in an
aqueous medium or a mixture of the aqueous medium and an organic solvent(s)
containing hydroxy-L-lysine, cells transformed with genes encoding the enzymes, a
15 processed product of the transformed cells, and/or a culture broth obtained by
culturing the transformed cells.
Examples of the aqueous medium include water and buffers. Examples of
the organic solvent include those in which the reaction substrate is highly soluble,
such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, tert-butanol, acetone,
20 and dimethyl sulfoxide. Other examples of the organic solvent include ethyl acetate,
butyl acetate, toluene, chloroform, and n-hexane, which are effective for removal of
reaction by-products and the like.
[0094]
The reaction substrate hydroxy-L-lysine is usually used at a substrate
25 concentration within the range of 0.01% w/v to 90% w/v, preferably 0.1% w/v to
30%) w/v. The reaction substrate may be added at once when the reaction is started,
but is preferably added continuously or intermittently in view of reducing an effect of
30
substrate inhibition of the enzyme, if any, and increasing the concentration of the
product accumulated.
If necessary, a coenzyme(s) such as NAD(P)H is/are normally added at 0.001
mM to 100 mM, preferably 0.01 mM to 10 mM.
5 The reaction is carried out at a reaction temperature of usually 4°C to 60°C,
preferably 10°C to 45°C, at a pH of usually 3 to 11, preferably 5 to 8. The reaction
time is usually about 1 hour to about 72 hours.
[0095]
The hydroxy-L-pipecolic acid produced by the method of the present
10 invention can be purified, after the reaction, by separating cells and proteins in the
reaction mixture by centrifugation, membrane treatment, and/or the like, and then
performing an appropriate combination of methods such as extraction with an
organic solvent(s), for example, 1-butanol and/or tert-butanol; distillation; column
chromatography using an ion-exchange resin(s), silica gel, and/or the like; isoelectric
1 5 crystallization; and/or crystallization with monohydrochloride, dihydrochloride,
and/or calcium salt.
[0096]
The second method of the present invention for producing hydroxy-Lpipecolic
acid from hydroxy-L-lysine is as follows.
20 A method for producing hydroxy-L-pipecolic acid, which method comprises:
allowing hydroxy-L-lysine to react with at least one enzyme selected from the
group consisting of L-lysine 6-oxidase, L-lysine 6-dehydrogenase, and L-lysine 6-
transferase to produce a cyclic amino acid having a double bond at the 6-position
represented by General Formula (IV); and
25 allowing pyrroline-5-carboxylate reductase to act on the resulting cyclic
amino acid having a double bond at the 6-position to produce hydroxy-L-pipecolic
acid represented by General Formula (in):
10
[0097]
(wherein each of R1, R2 and R3 represents a hydrogen atom or hydroxyl group, with
the proviso that at least one of R1, R2 and R3 represents a hydroxyl group).
[0098]
The method is described below by way of an exemplary scheme (in the
formula, each of R1, R2 and R3 represents a hydrogen atom or hydroxyl group, with
the proviso that at least one of R1, R2 and R3 represents a hydroxyl group).
[0099]
[0100]
First, the compound (a) (hydroxy-L-lysine) is converted to the compound (b)
15 by at least one enzyme selected from the group consisting of L-lysine 6-oxidase, Llysine
6-dehydrogenase, and L-lysine 6-transferase, and this is followed by
spontaneous conversion of the compound (b') to the compound (c'). The compound
32
(c') is then converted to the compound (d) (hydroxy-L-pipecolic acid) by pyrroline-5-
carboxylate (P5C) reductase.
[0101]
The L-lysine 6-oxidase is not limited as long as the L-lysine 6-oxidase can
5 catalyze a reaction in which the amino group at the 6-position of hydroxy-L-lysine is
converted to an oxo group. Examples of the L-lysine 6-oxidase include proteins
comprising the amino acid sequence of lodA described in Biochim. Biophys. Acta.,
2006, 1764 1577, and proteins comprising an amino acid sequence with an identity of
not less than 80%>, preferably not less than 90%, more preferably not less than 95% to
10 the amino acid sequence of lodA, while retaining the activity.
[0102]
The L-lysine 6-dehydrogenase is not limited as long as the L-lysine 6-
dehydrogenase can catalyze a reaction in which the amino group at the 6-position of
hydroxy-L-lysine is converted to an oxo group. Examples of the L-lysine 6-
1 5 dehydrogenase include proteins comprising the amino acid sequence described in J.
Biochem., 105, 1002-1008 (1989), and proteins comprising an amino acid sequence
with an identity of not less than 80%>, preferably not less than 90%, more preferably
not less than 95% to the amino acid sequence, while retaining the activity.
[0103]
20 The L-lysine 6-transferase (lysine-6-aminotransferase) is not limited as long
as the L-lysine 6-transferase can catalyze a reaction in which the amino group at the
6-position of hydroxy-L-lysine is converted to an oxo group. Examples of the Llysine
6-transferase include proteins comprising the amino acid sequence described
in WO 2001/048216, and proteins comprising an amino acid sequence with an
25 identity of not less than 80%, preferably not less than 90%, more preferably not less
than 95%) to the amino acid sequence, while retaining the activity.
[0104]
33
The pyrroline-5-carboxylate (P5C) reductase is not limited as long as the
pyrroline-5-carboxylate reductase can catalyze a reaction in which the compound
represented by General Formula (IV) is converted to hydroxy-L-pipecolic acid
represented by General Formula (HI). Examples of the pyrroline-5-carboxylate
5 reductase include proteins comprising the amino acid sequence described in WO
2001/048216, and proteins comprising an amino acid sequence with an identity of
not less than 80%>, preferably not less than 90%, more preferably not less than 95% to
the amino acid sequence, while retaining the activity
[0105]
10 Although the enzymatic reactions in Scheme 2 may be carried out separately,
the reactions are preferably carried out continuously in a single reaction system.
More preferably, the reactions are carried out by allowing cells containing the
enzymes which catalyze the reactions to react with hydroxy-L-lysine. Although the
cells containing the enzymes which catalyze the reactions may be cells intrinsically
1 5 having these enzymes, it is preferred to use cells transformed with DNA encoding the
enzymes. More specifically, it is preferred to use cells transformed with DNA
encoding at least one enzyme selected from the group consisting of L-lysine 6-
oxidase, L-lysine 6-dehydrogenase, and L-lysine 6-transferase, and DNA encoding
pyrroline-5-carboxylate (P5C) reductase.
20 [0106]
The method for transformation of the host cells such as microorganism cells,
the type of the host, and the like are the same as those described in the 2-
oxoglutarate-dependent L-lysine hydroxylase section.
[0107]
25 In cases where the reactions of Scheme 2 are continuously carried out in a
single reaction system, the scheme is preferably carried out in an aqueous medium or
a mixture of the aqueous medium and an organic solvent(s), containing hydroxy-L34
lysine, cells transformed with genes encoding the enzymes, a processed product of
the transformed cells, and/or a culture broth obtained by culturing the transformed
cells.
The reaction conditions, addition and regeneration of co-enzyme, and the
5 method of recovery of hydroxy-L-pipecolic acid are the same as those described in
the section .
[0108]
The third method of the present invention for producing hydroxy-L-pipecolic
acid from hydroxy-L-lysine is as follows.
10 A method for producing hydroxy-L-pipecolic acid, which method comprises
allowing lysine cyclodeaminase to act on hydroxy-L-lysine to produce hydroxy-Lpipecolic
acid represented by General Formula (HI).
[0109]
The lysine cyclodeaminase is not limited as long as the lysine cyclodeaminase
1 5 can catalyze a reaction in which hydroxy-L-lysine is converted to hydroxy-Lpipecolic
acid. Examples of the lysine cyclodeaminase include proteins comprising
the amino acid sequence described in Biochimie 2007, 89, 591, and proteins
comprising an amino acid sequence with an identity of not less than 80%, preferably
not less than 90%, more preferably not less than 95% to the amino acid sequence,
20 while retaining the activity.
[0110]
The reaction by lysine cyclodeaminase is preferably carried out by allowing
cells containing lysine cyclodeaminase to react with hydroxy-L-lysine. Although
the microorganism containing lysine cyclodeaminase may be cells intrinsically
25 having the enzyme, it is preferred to use cells transformed with DNA encoding lysine
cyclodeaminase.
[0111]
35
The method for transformation of the host cells such as microorganism cells,
the type of the host, and the like are the same as those described in the 2-
oxoglutarate-dependent L-lysine hydroxylase section.
[0112]
5 In cases where the reaction of converting hydroxy-L-lysine to hydroxy-Lpipecolic
acid by lysine cyclodeaminase is carried out, the reaction is preferably
carried out in an aqueous medium or a mixture of the aqueous medium and an
organic solvent(s), containing hydroxy-L-lysine, cells transformed with DNA
encoding lysine cyclodeaminase, a processed product of the transformed cells, and/or
10 a culture broth obtained by culturing the transformed cells.
The reaction conditions, addition and regeneration of co-enzyme, and the
method of recovery of hydroxy-L-pipecolic acid are the same as those described in
the section .
[0113]
15 It is also possible to produce hydroxy-L-pipecolic acid directly from L-lysine
using, at once, 2-oxoglutarate-dependent L-lysine hydroxylase and an enzyme(s)
which convert(s) hydroxy-L-lysine to hydroxy-L-pipecolic acid. However, since the
enzyme(s) which convert(s) hydroxy-L-lysine to hydroxy-L-pipecolic acid may act on
L-lysine to cause by-production of L-pipecolic acid before the 2-oxoglutarate-
20 dependent L-lysine hydroxylase acts on L-lysine, the enzyme(s) which convert(s)
hydroxy-L-lysine to hydroxy-L-pipecolic acid need(s) to be an enzyme(s) which
preferentially act(s) on hydroxy-L-lysine rather than L-lysine. In such cases, the
host cells may be transformed at once with DNA for 2-oxoglutarate-dependent Llysine
hydroxylase and DNA for the enzyme(s) which convert(s) hydroxy-L-lysine to
25 hydroxy-L-pipecolic acid.
[0114]
In cases where hydroxy-L-lysine produced by the method of the present
36
invention is used for production of hydroxy-L-pipecolic acid, purification of the
hydroxy-L-lysine may be omitted, and the only purification to be carried out may be
purification after the conversion to hydroxy-L-pipecolic acid.
[0115]
5 EXAMPLES
The present invention is described below in more detail by way of Examples,
but the present invention is not limited by these.
Example 1
[0116]
10 Cloning of 2-oxoglutarate-dependent L-lysine Hydroxylase Gene
Based on a gene sequence (hyl-1, SEQ ID NO: 1) encoding an L-arginine-P
hydroxylase VioC homologue Hyl-1 derived from the Flavobacterium johnsoniae
NBRC14942 strain (GenBank Accession No. ABQ06186, SEQ ID NO:2), primers
for amplifying the full-length sequence of the hyl-1 gene, hyll_F (SEQ ID NO: 13)
1 5 and hyl 1_R (SEQ ID NO: 14), were designed and synthesized. Using chromosomal
DNA ofFlavobacterium johnsoniae as a template, PCR was carried out according to
a conventional method, to obtain a DNA fragment of about 1.0 kbp.
In addition, VioC homologues derived from the Kineococcus radiotolerans
NBRC101839 strain, Chitinophagapinensisl