CN110396506B - L-pantolactone dehydrogenase derived from Nocardia asteroids and use thereof - Google Patents

L-pantolactone dehydrogenase derived from Nocardia asteroids and use thereof Download PDF

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CN110396506B
CN110396506B CN201910366921.2A CN201910366921A CN110396506B CN 110396506 B CN110396506 B CN 110396506B CN 201910366921 A CN201910366921 A CN 201910366921A CN 110396506 B CN110396506 B CN 110396506B
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pantolactone
dehydrogenase
ketopantolactone
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CN110396506A (en
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应向贤
汪钊
赵嫚
程先锋
林行
殷杭华
毛王伟
陈梁
张连春
白彦兵
刘学愚
娄波
沈汉军
刘一骏
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Hangzhou Xinfu Technology Co ltd
Zhejiang University of Technology ZJUT
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Abstract

The invention relates to the technical field of genetic engineering, in particular to L-pantolactone dehydrogenase and application thereof. The invention discloses L-pantolactone dehydrogenase derived from Nocardia asteroids for the first time, which has good enzymatic activity on L-pantolactone and can be applied to catalytic synthesis of D-pantolactone. The invention constructs a system for synthesizing D-pantolactone by chiral turnover of L-pantolactone under the catalysis of multienzyme cascade, takes genetic engineering bacteria cells which co-express L-pantolactone dehydrogenase, D-ketopantolactone reductase and glucose dehydrogenase as catalysts, avoids accumulation and spontaneous hydrolysis of intermediate ketopantolactone, omits the steps of separation of the intermediate product, racemization of L-pantolactone, lactonization of D-pantolactone under an acidic condition and the like, simplifies the reaction process, reduces the use of acid and alkali and improves the reaction efficiency.

Description

L-pantolactone dehydrogenase derived from Nocardia asteroids and use thereof
Technical Field
The invention relates to the technical field of microbial genetic engineering, in particular to L-pantoate lactone dehydrogenase derived from Nocardia asteroids, a coding gene, a vector, a recombinant cell and application thereof.
Background
Calcium D-pantothenate, also known as vitamin B5, is a component of coenzyme A and has been widely used in the industries of medicine, food, feed, cosmetics, and the like. D-pantoic acid lactone is an important raw material for synthesizing D-calcium pantothenate, DL-pantoic acid lactone is synthesized by a chemical method in industrial production, then the D-pantoic acid lactone in the mixed pantoic acid lactone is selectively hydrolyzed by utilizing lactone hydrolase to generate D-pantoic acid, then the D-pantoic acid and the L-pantoic acid lactone are separated, the separated D-pantoic acid is acidified to form the D-pantoic acid lactone through cyclization, and the L-pantoic acid lactone is recycled after racemization. Therefore, although the process is mature, the chiral resolution method catalyzed by hydrolase still has the problems of long steps, high acid and base consumption and the like. In view of this, the development of a more direct, efficient and environment-friendly asymmetric synthesis method of D-pantolactone to replace the existing chiral resolution technology has important application value. The first method is to take DL-pantolactone as a substrate, utilize L-pantolactone dehydrogenase with specific stereoselectivity to catalyze L-pantolactone to dehydrogenate to generate ketopantolactone, and then the ketopantolactone is asymmetrically generated to generate the D-pantolactone under the catalysis of the D-ketopantolactone reductase; the second approach is also to catalyze the dehydrogenation of L-pantolactone with L-pantolactone dehydrogenase to produce ketopantolactone, then the spontaneous hydrolysis of ketopantolactone to form ketopantoate, then the D-pantoate is produced under the action of D-ketopantoate reductase, and then the ring closure of D-pantoate is carried out under the action of acid to form D-pantolactone. The process is simpler and more convenient by using the first path, compared with the existing hydrolase catalysis path, the process is simpler, the substrate of the mixed rotation directly obtains an optical pure product through biological catalysis, a racemization step is not needed, and a separation step of lactone and acid is not needed; a coenzyme circulating system is constructed in the genetic engineering bacteria, and the coenzyme does not need to be added; the genetic engineering bacteria are used as the whole cell catalyst, and the separation and purification steps of enzyme are not needed. Therefore, the method for asymmetrically synthesizing D-pantolactone by using oxidoreductase is a very promising substitute of biological hydrolase.
Dehydrogenation of L-pantolactone in a redox process is one of its key steps, and L-pantolactone dehydrogenase is a key enzyme catalyzing the reaction. The lack of the currently known L-pantolactone dehydrogenases with a small amount and excellent catalytic performance limits the application of the redox enzyme method in the asymmetric synthesis of D-pantolactone. L-pantolactone dehydrogenase, which has been studied more, includes L-pantolactone dehydrogenase derived from Rhodococcus erythropolis and L-pantolactone dehydrogenase derived from Nocardia asteroides. The difficulty of multi-enzyme combination catalysis is increased by the fact that L-pantolactone dehydrogenase derived from rhodococcus erythropolis cannot be expressed in an escherichia coli system in a recombinant mode. The gene engineering bacterium AKU2103 which enhances the expression of the Rhodococcus erythropolis L-pantolactone dehydrogenase gene in the same Rhodococcus erythropolis is used as a biocatalyst to catalyze the dehydrogenation reaction of 0.768M L-pantolactone for 144h, and the conversion rate of the reaction is 91.9%. The L-pantolactone dehydrogenation product is keto-pantolactone, which is easily hydrolyzed spontaneously into keto-pantoic acid. After 144h of the reaction, recombinant Escherichia coli expressing D-ketopantoate reductase is further added as a biocatalyst, and the produced ketopantoate can be completely converted into D-pantoate after 24h of the reduction reaction. Finally, the D-pantoic acid is acidified to D-pantoic acid lactone (SiD, Urano N, Nozakis, et al, L-pantoyl lactate dehydrogenase from Rhodococcus erythropolis: genetic analytes and applications to the stereospecific oxidation of L-pantoyl lactate. applied Microbiology and Biotechnology 2012,95: 431-. Furthermore, L-pantolactone dehydrogenase derived from Nocardia asteroides has been studied for its enzymatic properties in more detail (Kataoka M, Shimizu S, Yamada H. purification and characterization of novel FMN-dependent enzyme: membrane-bound L- (+) -glycosyl lactone dehydrogenase from Nocardia intermediates. European Journal of Biochemistry,1992,204,799-806), but its coding gene is still unknown, preventing its further use in biocatalysis.
There has been no report of L-pantolactone dehydrogenase derived from Nocardia asteroids, nor of L-pantolactone dehydrogenase derived from Nocardia asteroids for synthesizing D-pantolactone by catalyzing L-pantolactone chiral inversion in a multi-enzyme cascade.
Disclosure of Invention
In view of the above, the present invention aims to provide L-pantolactone dehydrogenase derived from Nocardia asteroids and use thereof.
In a first aspect of the present invention, there is provided an L-pantolactone dehydrogenase derived from Nocardia asteroids and having an amino acid sequence shown in SEQ ID No. 2.
In another aspect of the present invention, there is provided an isolated polynucleotide which is a polynucleotide encoding the L-pantolactone dehydrogenase.
In a preferred embodiment, the polynucleotide sequence of the polynucleotide is selected from the group consisting of: (3a) the nucleotide sequence shown as SEQ ID No. 1; (3b) a nucleotide sequence complementary to the nucleotide sequence of (3 a).
In another aspect of the present invention, there is provided a vector comprising a polynucleotide encoding the L-pantolactone dehydrogenase.
In another aspect of the present invention, there is provided a recombinant cell comprising the vector or genome integrated with a polynucleotide encoding the L-pantolactone dehydrogenase.
In another aspect of the present invention, there is provided the use of said L-pantolactone dehydrogenase in catalyzing L-pantolactone to produce D-pantolactone.
In another aspect of the present invention, there is provided a multi-enzyme recombinant cell that induces production of the L-pantolactone dehydrogenase and D-ketopantolactone reductase.
In a preferred embodiment, the D-ketopantolactone reductase is derived from Saccharomyces cerevisiae, and the amino acid sequence of the D-ketopantolactone reductase is shown as SEQ ID No. 4.
Further, the polynucleotide sequence encoding the D-ketopantolactone reductase is selected from the group consisting of: (9a) the nucleotide sequence shown as SEQ ID No. 3; (9b) a nucleotide sequence complementary to the nucleotide sequence of (9 a).
In another preferred embodiment, the multi-enzyme recombinant cell further induces production of glucose dehydrogenase.
Furthermore, the glucose dehydrogenase is derived from a microbacterium, and the amino acid sequence of the glucose dehydrogenase is shown as SEQ ID No. 6.
Further, the polynucleotide sequence encoding the glucose dehydrogenase is selected from the group consisting of: (12a) the nucleotide sequence shown as SEQ ID No. 5; (12b) a nucleotide sequence complementary to the nucleotide sequence of (12 a).
In another aspect of the present invention, there is provided a method for constructing a multi-enzyme recombinant cell, comprising:
step one, inserting polynucleotide for coding the L-pantoate lactone dehydrogenase into a first vector to obtain a first recombinant vector; inserting a polynucleotide encoding the D-ketopantolactone reductase into a second vector to obtain a second recombinant vector; and
and step two, introducing the first recombinant vector and the second recombinant vector into a host cell to obtain the multienzyme recombinant cell.
In a preferred embodiment, in the first step, the polynucleotide encoding the D-ketopantolactone reductase and the polynucleotide encoding the glucose dehydrogenase are inserted into a second vector to obtain a second recombinant vector.
In another preferred embodiment, the first vector is pET-28b, the second vector is pACYCDuet-1, and the host cell is E.coli BL21(DE 3).
In another aspect of the invention, the invention also provides a method for preparing D-pantolactone, which utilizes L-pantolactone dehydrogenase and D-ketopantolactone reductase induced by the multi-enzyme recombinant cell to catalyze L-pantolactone to generate D-pantolactone.
In a preferred embodiment, the multi-enzyme recombinant cell further induces production of glucose dehydrogenase, and the NADP in the reaction system is continuously catalyzed by the glucose dehydrogenase using glucose as a co-substrate+Converted into NADPH.
In another preferred example, the method further comprises: separating D-pantoic acid lactone from the reaction system after the reaction.
Compared with the prior art, the invention has the following beneficial effects: the present invention provides an L-pantolactone dehydrogenase derived from Nocardia asteroides, a gene encoding the same, a vector and a recombinant cell, wherein the L-pantolactone dehydrogenase has an excellent enzymatic activity on L-pantolactone. The L-pantolactone dehydrogenase derived from Nocardia asteroids is applied to multi-enzyme cascade catalytic synthesis of D-pantolactone, so that the L-pantolactone is directly subjected to chiral turnover to generate the D-pantolactone, and the accumulation and spontaneous hydrolysis of an intermediate product, namely the keto-pantolactone are avoided. Compared with the selective resolution process, the preparation method of D-pantolactone provided by the invention avoids the steps of separation of intermediate products, racemization of L-pantolactone, lactonization of D-pantolactone and the like under an acidic condition, simplifies the reaction process, reduces the use of acid and alkali, and improves the reaction efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts;
FIG. 1 is a schematic diagram of the direct chiral inversion of L-pantolactone to D-pantolactone of the present invention;
FIG. 2 is a SDS-PAGE detection of L-pantolactone dehydrogenase in example 1 of the present invention, wherein: lane Control corresponds to uninduced recombinant cells; lane 1 corresponds to recombinant cells after induction culture;
FIG. 3 is a SDS-PAGE detection of L-pantolactone dehydrogenase, ketopantolactone reductase and glucose dehydrogenase in example 6 of the present invention, wherein: lane Control corresponds to uninduced multienzyme recombinant cells; lane 1 corresponds to the multi-enzyme recombinant cells after induction culture;
FIG. 4 is a gas chromatogram of D-pantolactone, L-pantolactone and ketopantolactone of example 7 of the present invention;
FIG. 5 is a GC-MS analysis spectrum of the product D-pantolactone isolated in example 9 of the present invention;
FIG. 6 is a diagram of the product D-pantolactone isolated in example 9 of the present invention1HNMR spectrogram;
FIG. 7 is a diagram of the product D-pantolactone isolated in example 9 of the present invention13C NMR spectrum;
reference numerals:
NasLPLDH: l-pantolactone dehydrogenase derived from Nocardia asteroids; SceCPR 1: saccharomyces cerevisiae D-keto pantoate lactone reductase; EsGDH: a microbacterium glucose dehydrogenase; lane Marker, Protein Marker.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, fig. 1 is a schematic diagram of direct chiral inversion of L-pantolactone to D-pantolactone according to the present invention; FIG. 2 is a SDS-PAGE detection chart of L-pantolactone dehydrogenase in example 1 of the present invention; FIG. 3 is a SDS-PAGE detection of L-pantolactone dehydrogenase, ketopantolactone reductase and glucose dehydrogenase in example 6 of the present invention; FIG. 4 is a gas chromatogram of D-pantolactone, L-pantolactone and ketopantolactone of example 7 of the present invention; FIG. 5 is a GC-MS analysis spectrum of the product D-pantolactone isolated in example 9 of the present invention; FIG. 5 is a diagram of the product D-pantolactone isolated in example 9 of the present invention1H NMR spectrum; FIG. 6 is a diagram of the product D-pantolactone isolated in example 9 of the present invention13C NMR spectrum.
The invention provides an oxidoreductase derived from Nocardia asteroids, which has excellent dehydrogenase activity on hydroxyl hydrogen on L-pantolactone (namely L-pantolactone dehydrogenase) and can be applied to the synthesis of D-pantolactone.
The invention also provides a polynucleotide for coding the L-pantolactone dehydrogenase and a multienzyme recombinant cell for expressing the L-pantolactone dehydrogenase.
The invention also provides application of the L-pantolactone dehydrogenase in catalyzing and generating D-pantolactone.
The invention also constructs a multienzyme cascade catalytic reaction system, realizes the direct chiral turnover of the L-pantoic acid lactone to generate the D-pantoic acid lactone, simplifies the reaction process, improves the efficiency of catalytic reaction and reduces the production cost.
L-pantolactone dehydrogenase, polynucleotide encoding same, vector, and recombinant cell
The invention discloses a novel L-pantolactone dehydrogenase which has dehydrogenase activity on hydroxyl hydrogen on L-pantolactone and can be applied to the production of D-pantolactone. The L-pantolactone dehydrogenase is derived from Nocardia asteroids, and the amino acid sequence of the L-pantolactone dehydrogenase is shown as SEQ ID No. 2.
The enzyme of the invention may be a naturally occurring, recombinant or synthetic active polypeptide. The active polypeptide may be a naturally purified product, or a product that is chemically synthesized, or a product that is produced from a prokaryotic (e.g., E.coli) or eukaryotic host (e.g., yeast) using recombinant techniques.
The invention discloses a polynucleotide for coding L-pantolactone dehydrogenase, preferably, the polynucleotide sequence is shown as SEQ ID No. 1. The polynucleotide of the present invention may be in the form of DNA or RNA. The DNA may be single-stranded or double-stranded. The single-stranded DNA may be a coding strand or a non-coding strand.
The polynucleotide encoding L-pantolactone dehydrogenase of the present invention can be usually obtained by PCR amplification or artificial synthesis.
The invention also includes the variant of the polynucleotide for coding L-pantolactone dehydrogenase, which codes the polypeptide with the same amino acid sequence as SEQ ID No. 2. The variant of the polynucleotide may be a naturally occurring variant or a non-naturally occurring variant. Variants of the polynucleotide may be those resulting from substitution, deletion and/or insertion of one or more bases. Variants of the polynucleotides encode polypeptides that do not lose enzymatic activity on ketopantolactone.
The invention also includes the vector of the polynucleotide, such as cloning vector and expression vector, the replication of the related sequence is realized by the cloning vector, and the expression of the gene function is realized by the expression vector.
The present invention also includes a recombinant cell produced by introducing the vector into a host cell or a recombinant cell having the polynucleotide integrated into its genome, which is used for expressing L-pantolactone dehydrogenase. The host cell may be a prokaryotic cell or a eukaryotic cell, such as E.coli, yeast, and the like.
Preferably, the polynucleotide sequence for coding the L-pantolactone dehydrogenase is connected with a vector pET-28b, then is transferred into Escherichia coli E.coli BL21(DE3), and the L-pantolactone dehydrogenase is efficiently expressed through induction culture.
Application of L-pantolactone dehydrogenase in catalytic generation of D-pantolactone
The L-pantolactone dehydrogenase of the present invention has an enzymatic activity on L-pantolactone, and can be used for producing D-pantolactone. The catalyst in the reaction can be L-pantolactone dehydrogenase which is separated and purified, or recombinant cells which are subjected to induction culture. The recombinant cell can be wet thallus separated after culture, and can also be cell freeze-dried powder. In either of the above forms, L-pantolactone is substantially catalyzed by L-pantolactone dehydrogenase produced by recombinant cells.
Multienzyme recombinant cell, related polynucleotide and construction method of multienzyme recombinant cell
The invention also provides a multienzyme recombinant cell which can simultaneously express the L-pantolactone dehydrogenase and the D-ketopantolactone reductase. The multienzyme recombinant cell can be applied to the biocatalytic reaction of directly chirally inverting L-pantolactone to generate D-pantolactone.
The invention also discloses the amino acid sequences and the coding nucleotide sequences of the L-pantolactone dehydrogenase and the D-ketopantolactone reductase produced by the multi-enzyme recombinant cell.
The polynucleotide of the present invention may be in the form of DNA or RNA. The DNA may be single-stranded or double-stranded. The single-stranded DNA may be a coding strand or a non-coding strand. The polynucleotide encoding the enzyme of the present invention can be obtained by PCR amplification or artificial synthesis.
Preferably, the D-ketopantolactone reductase is D-ketopantolactone reductase (SceCPR1) derived from saccharomyces cerevisiae, and the amino acid sequence of the D-ketopantolactone reductase is shown as SEQ ID No. 4; also includes the polypeptide obtained by substituting, deleting and/or adding one or more amino acids of the amino acid sequence shown in SEQ ID No. 4 in the activity maintaining range.
The invention also includes polynucleotides encoding the D-ketopantolactone reductase. Preferably, the polynucleotide sequence is shown as SEQ ID No. 3; also included are variants of the polynucleotides that encode polypeptides having the same amino acid sequence as SEQ ID No. 4. The variant of the polynucleotide may be a naturally occurring variant or a non-naturally occurring variant. Variants of the polynucleotide may be those resulting from substitution, deletion and/or insertion of one or more bases.
In a system for producing D-pantolactone by catalyzing L-pantolactone by a multienzyme recombinant cell, NADPH is required as a hydrogen donor. However, if NADPH is added directly to the reaction system in an industrial production, the cost becomes very high. Therefore, in order to make the multienzyme recombinant cell more suitable for industrial production, it can also induce the production of glucose dehydrogenase by further modification. During reaction, glucose is added into the system as co-substrate, and the induced glucose dehydrogenase can continuously react with NADP+Conversion to NADPH, with simultaneous conversion of glucose to gluconic acid.
Preferably, the glucose dehydrogenase is glucose dehydrogenase (EsGDH) derived from a micro bacillus, and the amino acid sequence of the glucose dehydrogenase is shown as SEQ ID No. 6; also includes the derivative of the glucose dehydrogenase, which can be a polypeptide obtained by substituting, deleting and/or adding one or more amino acids of the amino acid sequence shown in SEQ ID No. 6 within the range of keeping the activity.
The present invention also includes polynucleotides encoding the glucose dehydrogenase. Preferably, the polynucleotide sequence is shown as SEQ ID No. 5; also included are variants of the polynucleotides that encode polypeptides having the same amino acid sequence as SEQ ID No. 6. The variant of the polynucleotide may be a naturally occurring variant or a non-naturally occurring variant. Variants of the polynucleotide may be those resulting from substitution, deletion and/or insertion of one or more bases.
The invention also discloses a construction method of the multienzyme recombinant cell, which comprises the following steps:
s11, inserting a polynucleotide encoding L-pantolactone dehydrogenase into a first vector, thereby obtaining a first recombinant vector; inserting the polynucleotides encoding D-ketopantolactone reductase into second vectors, respectively, to obtain second recombinant vectors.
S12, introducing the first recombinant vector and the second recombinant vector into a host cell to obtain the multienzyme recombinant cell. The host cell may be a prokaryotic cell or a eukaryotic cell, such as E.coli, yeast, and the like.
Furthermore, in order to reduce the production cost and make the recombinant cell more suitable for industrial production, a gene encoding glucose dehydrogenase may be introduced into the multienzyme recombinant cell. Namely, the polynucleotide encoding the D-ketopantolactone reductase and the polynucleotide encoding the glucose dehydrogenase are inserted into a second vector to obtain a second recombinant vector. Then, the first recombinant vector and the second recombinant vector are introduced into a host cell to obtain the multienzyme recombinant cell. The multienzyme recombinant cell can simultaneously produce L-pantolactone dehydrogenase, D-ketopantolactone reductase and glucose dehydrogenase through induction culture.
Preferably, the first vector is pET-28b, the second vector is pacycdue-1, and the host cell is e.coli BL21(DE 3).
Method for generating D-pantolactone by multi-enzyme cascade catalysis
The invention also discloses a method for preparing D-pantolactone, which utilizes L-pantolactone dehydrogenase and D-ketopantolactone reductase which are induced and generated by the multienzyme recombinant cell to catalyze the direct chiral inversion of L-pantolactone to generate the D-pantolactone.
In the above reaction system, since there is no coenzyme regeneration system, it is necessary to add NADPH, which is expensive, during the reaction, and this is not favorable for large-scale industrial production. In order to reduce the cost of large-scale industrial production, the multienzyme recombinant cell can simultaneously induce and produce L-pantolactone dehydrogenase, D-ketopantolactone reductase and glucose dehydrogenase, so that a coenzyme regeneration system is established in a reaction system. The reaction principle is shown in figure 1, and the substrate is L-pantoic acid lactoneThe co-substrate is glucose, NADPH is a hydrogen donor, and the glucose dehydrogenase continuously converts NADP+Conversion to NADPH, with simultaneous conversion of glucose to gluconic acid. The method leads L-pantoic acid lactone to be directly subjected to chiral turnover to generate D-pantoic acid lactone, avoids the accumulation and spontaneous hydrolysis of intermediate keto-pantoic acid lactone, avoids the steps of separation of the intermediate, racemization of the L-pantoic acid lactone, lactonization of the D-pantoic acid under an acidic condition and the like, simplifies the reaction process, reduces the use of acid and alkali and improves the reaction efficiency.
In order to further illustrate the present invention, the following examples are given to describe the L-pantolactone dehydrogenase provided by the present invention and its application in detail. The experimental procedures, for which specific conditions are not indicated in the following examples, are generally carried out according to the conventional experimental procedures in the field of molecular biology, such as those described in J. SammBruk et al, molecular cloning, A laboratory Manual, third edition, scientific Press, 2002, or according to the manufacturer's recommendations.
Example 1 construction and expression of L-pantolactone dehydrogenase Gene engineering bacteria
The L-pantolactone dehydrogenase encoding gene is artificially synthesized (gene synthesis service provided by Jinzhi Biotechnology Limited, Suzhou) after codon optimization by using the published oxidoreductase encoding gene (GenBank accession number is GAD85679.1) derived from Nocardia asteroids, and the nucleotide sequence of the L-pantolactone dehydrogenase encoding gene is shown as SEQ ID NO. 1.
The gene encoding L-pantolactone dehydrogenase (NasLPLDH) derived from Nocardia asteroids was inserted into Hind III and Xho I sites on plasmid pET-28b to give recombinant plasmid pET-28 b-NasLPLDH. pET-28b-NasLPLDH is transferred into E.coli BL21(DE3) to obtain the gene engineering bacterium E.coli BL21(DE3)/pET-28 b-NasLPLDH.
The genetically engineered bacterium E.coli BL21(DE3)/pET-28b-NasLPLDH was inoculated into LB liquid medium containing kanamycin to a final concentration of 100. mu.g/mL and cultured overnight at 37 ℃ and 200 rpm. The culture was inoculated into 150mL of LB liquid medium containing 100. mu.g/mL of kanamycin at an inoculum size of 2% by volume, and cultured at 37 ℃ and 200rpm until the cell density OD6000.6 to 0.8, and subjecting to culturingTo the resultant was added IPTG at a final concentration of 0.3mM, induced culture at 22 ℃ for 16 hours, and then the wet cells were collected by centrifugation and washed 2 times with a phosphate buffer solution of pH7.0 to resuspend the wet cells. As shown in FIG. 2, SDS-PAGE detection of the induced genetically engineered bacteria revealed that L-pantolactone dehydrogenase derived from Nocardia asteroids was successfully expressed in E.coli.
Example 2 investigation of substrate specificity of L-pantolactone dehydrogenase
The wet thallus obtained by the induced expression of the genetically engineered bacterium E.coli BL21(DE3)/pET-28b-NasLPLDH is used as a biocatalyst. The substrate specificity of L-pantolactone dehydrogenase derived from Nocardia asteroides was examined by whole-cell catalysis using 100mM of D-pantolactone, L-pantolactone, DL-pantolactone, D-pantoic acid and L-pantoic acid as substrates, respectively. The reaction system for catalyzing L-pantolactone dehydrogenation by L-pantolactone dehydrogenase is 5mL, and the reaction system respectively comprises: 1g of wet cells, 100mM substrate and 200mM phosphate buffer (pH 7.0). Adding the reaction solution into a three-neck flask, maintaining the reaction conditions at 30 ℃, 600rpm and pH7.0 under magnetic stirring, and dropwise adding 1MNa in the catalytic process2CO3The solution maintained the pH constant. After 6 hours of reaction, 100. mu.L of the reaction solution was added with 4M hydrochloric acid of the same volume, centrifuged to obtain 100. mu.L of the supernatant, and 1mL of ethyl acetate was added thereto for sufficient extraction. And centrifuging the extract, absorbing the upper organic phase into a centrifuge tube, adding anhydrous sodium sulfate to remove water, centrifuging again, taking the supernatant, and transferring into a gas phase sample bottle for gas chromatography detection. Substrate specificity results as shown in table 1, L-pantoate dehydrogenase derived from Nocardia asteroides is unable to catalyze D-pantolactone, D-pantoate and L-pantoate, and is able to catalyze L-pantolactone and DL-pantolactone. The above results show that L-pantoate dehydrogenase derived from Nocardia asteroids acts exclusively on the dehydrogenation of L-pantolactone.
TABLE 1 substrate specificity of L-pantoate dehydrogenase derived from Nocardia asteroids
Substrate Catalytic activity
D-pantoic acid lactone Is free of
L-pantoic acid lactone Is provided with
DL-pantoic acid lactone Is provided with
D-pantoic acid Is free of
L-pantoic acid Is free of
Example 3 acquisition of a Gene encoding D-ketopantolactone reductase
A D-ketopantolactone reductase coding gene is artificially synthesized (gene synthesis service provided by Jinzhi Biotechnology Limited, Suzhou) by utilizing a disclosed reductase coding gene (the GenBank accession number is CAA98692.1) derived from Saccharomyces cerevisiae (Saccharomyces cerevisiae) after codon optimization, and the nucleotide sequence is shown as SEQ ID NO: 3.
Example 4 acquisition of glucose dehydrogenase-encoding Gene
A glucose dehydrogenase encoding gene of the micro-bacillus (provided by Jinzhi biotechnology, Suzhou) is artificially synthesized by utilizing a disclosed dehydrogenase encoding gene (with the GenBank accession number of ACB59697.1) derived from the micro-bacillus (Exiguobacterium sibiricum) after codon optimization, and the nucleotide sequence is shown as SEQ ID NO: 5.
Example 5 construction of Multi-enzyme recombinant cells
Double-enzyme recombinant cell
A gene encoding D-ketopantolactone reductase of Saccharomyces cerevisiae (nucleotide sequence is shown in SEQ ID NO: 3) was inserted into Nco I/Hind III site on plasmid pACYCDuet-1 to obtain recombinant plasmid pACYCDuet-1-SceCPR 1. The gene engineering bacterium E.coli BL21(DE3)/pACYCDuet-1-SceCPR1 is obtained by transferring pACYCDuet-1-SceCPR1 into E.coli BL21(DE 3).
The genetically engineered bacterium E.coli BL21(DE3)/pACYCDuet1-SceCPR1 was streaked on LB solid medium containing 50. mu.g/mL chloramphenicol, and a single colony was picked and inoculated into 50mL LB liquid medium, and added with 50. mu.g/mL chloramphenicol at a final concentration, and shake-cultured at 37 ℃ and 200rpm for 10 hours. Transferring 1mL of the seed solution to 50mL of LB liquid medium containing 50. mu.g/mL of chloramphenicol, and culturing at 37 ℃ and 200rpm to OD600Cooling on ice for half an hour to 0.3-0.5, taking bacterial liquid, centrifuging, washing the bacterial liquid, and treating with calcium chloride solution to prepare E.coli BL21(DE3)/pACYCDuet-1-SceCPR1 competent cells. The recombinant plasmid pET-28b-NasLPLDH is introduced into E.coli BL21(DE3)/pACYCDuet1-SceCPR1 competent cells to obtain the genetically engineered bacterium E.coli BL21(DE3)/pET-28b-NasLPLDH/pACYCDuet1-SceCPR 1.
Extracted plasmid sequencing of genetically engineered bacteria E.coli BL21(DE3)/pACYCDuet-1-SceCPR1 and E.coli BL21(DE3)/pET-28b-NasLPLDH/pACYCDuet1-SceCPR1 shows that the coding genes of the enzymes are inserted into the corresponding genetically engineered bacteria without errors.
Tri-enzyme recombinant cell
A D-ketopantolactone reductase-encoding gene (nucleotide sequence is shown in SEQ ID NO: 3) of Saccharomyces cerevisiae and a glucose dehydrogenase-encoding gene (nucleotide sequence is shown in SEQ ID NO: 5) of Microbacterium are inserted into the Nco I/Hind III site and the Nde I/Xho I site on the plasmid pACYCDuet-1 respectively to obtain the recombinant plasmid pACYCDuet-1-SceCPR 1-EsGDH. The pACYCDuet-1-SceCPR1-EsGDH was transformed into E.coli BL21(DE3) to obtain the genetically engineered bacterium E.coli BL21(DE3)/pACYCDuet-1-SceCPR 1-EsGDH.
The genetically engineered bacterium E.coli BL21(DE3)/pACYCDuet1-SceCPR 1-EsGDH was streaked on LB solid medium containing 50. mu.g/mL chloramphenicol, a single colony was picked and inoculated in 50mL LB liquid medium, andchloramphenicol was added to a final concentration of 50. mu.g/mL and shake-cultured at 37 ℃ and 200rpm for 10 h. Transferring 1mL of the seed solution to 50mL of LB liquid medium containing 50. mu.g/mL of chloramphenicol, and culturing at 37 ℃ and 200rpm to OD600Cooling on ice for half an hour to 0.3-0.5, taking bacterial liquid, centrifuging, washing the bacterial liquid, and treating with calcium chloride solution to prepare E.coli BL21(DE3)/pACYCDuet-1-SceCPR1-EsGDH competent cells. The recombinant plasmid pET-28b-NasLPLDH is introduced into E.coli BL21(DE3)/pACYCDuet1-SceCPR 1-EsGDH competent cells to obtain the genetically engineered bacterium E.coli BL21(DE3)/pET-28b-NasLPLDH/pACYCDuet1-SceCPR 1-EsGDH.
Extracted plasmid sequencing of the genetically engineered bacteria E.coli BL21(DE3)/pACYCDuet-1-SceCPR1-EsGDH and E.coli BL21(DE3)/pET-28b-NasLPLDH/pACYCDuet1-SceCPR1-EsGDH shows that the coding genes of the enzymes are inserted into the corresponding genetically engineered bacteria without errors.
Example 6 inducible expression of Multi-enzyme recombinant cells
The genetically engineered bacterium E.coli BL21(DE3)/pET-28b-NasLPLDH/pACYCDuet1-SceCPR1 was inoculated in LB liquid medium containing kanamycin at a final concentration of 100. mu.g/mL and chloramphenicol at a final concentration of 50. mu.g/mL, and cultured overnight at 37 ℃ and 200 rpm. The culture was inoculated into 150mL of LB liquid medium containing 100. mu.g/mL kanamycin and 50. mu.g/mL chloramphenicol at an inoculum size of 2% by volume, and cultured at 37 ℃ and 200rpm until the cell density OD6000.6 to 0.8, IPTG was added to the culture at a final concentration of 0.3mM, induction culture was carried out at 22 ℃ for 16 hours, and then wet cells were collected by centrifugation and washed 2 times with a phosphate buffer solution of pH7.0 to resuspend the wet cells. The detection of the induced genetic engineering bacteria shows that the L-pantolactone dehydrogenase derived from Nocardia asteroids and the saccharomyces cerevisiae ketopantolactone reductase are successfully expressed in escherichia coli.
The genetically engineered bacterium E.coli BL21(DE3)/pET-28b-NasLPLDH/pACYCDuet1-SceCPR1-EsGDH was inoculated into LB liquid medium containing 100. mu.g/mL kanamycin and 50. mu.g/mL chloramphenicol at a final concentration, and cultured overnight at 37 ℃ and 200 rpm. The culture was inoculated into 150mL of LB liquid medium containing 100. mu.g/mL kanamycin and 50. mu.g/mL chloramphenicol at an inoculum size of 2% by volume, and cultured at 37 ℃ and 200rpm until the cell density OD6000.6 to 0.8, IPTG was added to the culture at a final concentration of 0.3mM, induction culture was carried out at 22 ℃ for 16 hours, and then wet cells were collected by centrifugation and washed 2 times with a phosphate buffer solution of pH7.0 to resuspend the wet cells. As shown in FIG. 3, SDS-PAGE detection of the induced genetically engineered bacteria showed that L-pantolactone dehydrogenase, Saccharomyces cerevisiae ketopantolactone reductase and Microbacterium glucose dehydrogenase derived from Nocardia asteroids were successfully expressed in E.coli.
Example 7 gas chromatography analysis of D-pantolactone, L-pantolactone and ketopantolactone
Gas chromatography detection conditions of D-pantoic acid lactone, L-pantoic acid lactone and intermediate keto-pantoic acid lactone: agilent 7890A, chiral column BGB-174(30 m.times.250 μm.times.0.25 μm); the temperature of the sample injector and the detector is 250 ℃, and the column temperature is 175 ℃ and is kept for 7 min; the flow of carrier gas N2 is 30 mL/min; air flow 400mL/min, hydrogen flow 40mL/min, split ratio: 30:1, sample injection amount: 1 μ L. The retention times of D-pantolactone, L-pantolactone, and ketopantolactone were 5.32min, 5.53min, and 5.78min, respectively, as shown in FIG. 4. The above substances were weighed out respectively, and prepared to have final concentrations of 5mM, 10mM, 30mM, 50mM, 70mM, and 100mM with ethyl acetate, and a standard curve of concentration versus peak area of the substance was prepared by this gas phase detection method.
Example 8 direct Synthesis of D-pantolactone by Multi-enzyme Cascade catalysis of L-pantolactone chiral inversion
Two-enzyme system
Coli BL21(DE3)/pET28b-NasLPLDH/pACYCDuet1-SceCPR1 double-enzyme co-expression gene engineering bacteria are induced to express, and the obtained wet bacteria are used as biocatalysts. A catalytic system (5mL) for synthesizing D-pantolactone by chiral turnover of L-pantolactone under the catalysis of multienzyme cascade is as follows: 1g of wet cells, 250mM L-pantolactone and 100mM phosphate buffer (pH 5.0). Adding the reaction solution into a three-neck flask, maintaining the reaction conditions of 30 ℃ and pH5.0, and dropwise adding 1MNa in the catalysis process2CO3The solution maintained the pH constant.
The experimental results show that L-pantolactone cannot be completely converted without additional addition of NADPH. After addition of NADPH, the reaction was carried out for 24 hours, and then 100. mu.L of the reaction mixture was taken and subjected to gas chromatography. The gas chromatography detection result shows that after 24 hours of reaction, the yield of D-pantoic acid lactone is more than 99 percent, and the value of the product e.e. is more than 98 percent.
Three-enzyme system
Coli BL21(DE3)/pET28b-NasLPLDH/pACYCDuet1-SceCPR1-EsGDH three-enzyme co-expression genetic engineering bacteria are induced and expressed, and the obtained wet bacteria are used as biocatalysts. A catalytic system (5mL) for synthesizing D-pantolactone by chiral turnover of L-pantolactone under the catalysis of multienzyme cascade is as follows: 1g of wet biomass, 250mM L-pantolactone, 500mM of glucose as co-substrate and 100mM of phosphate buffer (pH 5.0). Adding the reaction solution into a three-neck flask, maintaining the reaction condition at 30 ℃ and pH5.0, and dropwise adding 1MNa in the catalysis process2CO3The solution maintained the pH constant.
After 24 hours of reaction, 100. mu.L of the reaction solution was added with an equal volume of 4M hydrochloric acid, centrifuged to obtain 100. mu.L of the supernatant, and 1mL of ethyl acetate was added thereto for sufficient extraction. And centrifuging the extract, absorbing the upper organic phase into a centrifuge tube, adding anhydrous sodium sulfate to remove water, centrifuging again, taking the supernatant, and transferring into a gas phase sample bottle for gas chromatography detection. The gas chromatography detection result shows that the yield of D-pantoic acid lactone is more than 99 percent, and the value of the product e.e. is more than 98 percent.
EXAMPLE 9 isolation preparation and characterization of the reaction product D-pantolactone
In the three-enzyme reaction system in the embodiment 8, ethyl acetate 2 times of the reaction solution is added into the reaction solution after 24 hours of reaction, the mixture is fully stirred and extracted for 1 hour, the mixture is kept still for half an hour, then the upper-layer extraction liquid and the lower-layer reaction solution are separated, 10mL of ethyl acetate is added into the separated reaction solution to be extracted once in the same operation, the two extraction liquids are combined, the extraction liquids are concentrated, crystallized and dried to obtain a product, and the total yield of the product is more than 90%. The product obtained was used for gas-mass spectrometry (GC-MS) and Nuclear Magnetic (NMR) detection.
The molecular weight of the substance is analyzed and detected by using a gas-mass spectrometer, and the molecular structure of the substance is preliminarily analyzed. The molecular weight of the product was determined to be 130, consistent with the expected results, as shown in fig. 5.
Further by nuclear magnetismResonance spectroscopy to analyze the structure of the product. 0.01g of the product is weighed out and dissolved in CDCl3And (6) detecting. The obtained hydrogen spectrum detection results are shown in fig. 6:1HNMR(500MHz,CDCl3) δ 4.14(s,1H),4.02(d, J ═ 8.9Hz,1H),3.94(d, J ═ 8.9Hz,1H),1.22(s,3H),1.07(s, 3H). The results of the carbon spectra are shown in FIG. 7:13C NMR(125MHz,CDCl3) δ 177.67(s),77.29(s),77.03(s),76.78(s),76.43(s),75.74(s),40.87(s),22.89(s), 18.81(s). And searching the mass spectrum, the hydrogen spectrum and the carbon spectrum of the D-pantoic acid lactone by using the SciFinder, and comparing to confirm that the obtained product is the D-pantoic acid lactone.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Sequence listing
<110> Hangzhou Xin Fukejiu Co., Ltd
Zhejiang University of Technology
<120> L-pantolactone dehydrogenase derived from Nocardia asteroids and use thereof
<130> MP1908803
<160> 7
<170> SIPOSequenceListing 1.0
<210> 1
<211> 1215
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<213> Artificial Sequence (Artificial Sequence)
<400> 1
atgaatccct ggttcgagac cgtcgccgag gcgcagcgcc gcgcccgcaa gcgcctgccg 60
aaatcggtgt acggcgcgct gatcgcgggc tcggaacgcg gccagaccat cgaggacaac 120
caggccgcgt tcaccgaact cggcttcgcc ccgcactgcg cgggtccgat cggcgagcgc 180
gaccagtcca ccaccgtgct cggtcagcag ctgtcgatgc cggtcatgat ctcgcccacc 240
ggcgtgcagg cggtgcatcc cgacggtgag gtcgccgtgg ccagggccgc cgccgcgcgc 300
gggatcgcca tgggcctgag ctcgttcgcg agcaagccga tcgaagaggt cgtcgcggcc 360
aatccgtcca ccctgttcca gctgtactgg tgtggcaaca aggaccagat cctggagcgg 420
atggcccggg ccaaggcggc gggcgccgtg ggcctgatcc tcaccctgga ctggtcgttc 480
tcgcacgggc gcgactgggg cagcccggtg atcccggagt cgctgaacct gcgcaccatg 540
atgtcgttcg cgccgcagac cctggcccgc ccgcgctggc tcgccaccta cctgcgctcg 600
ggctccatcc ccgacctcac cgcgcccaac atggcggtcg gcggcggcgc ggcgcccggc 660
ttcttcggcg cctacggcga atggatgcag accccggccc cggactggga cgacgtggcc 720
tggatctgcg cgcagtggga cgggccggtg ctgctcaagg gcgtcatgcg ggtcgacgac 780
gcgctgcgcg cggtcgacgc gggcgtggcc ggcatctcgg tgtccaacca cggcggcaac 840
aacctcgacg gcacccccgc cgcgatccgc gcgctgccgg tgctggccga cgccgtcggc 900
gaccagatcg aggtggtgct cgacggtggc atccgccgtg gcagcgatgt ggtcaaggcc 960
gtggcgctgg gcgcccgcgc ggtcctgatc ggccgcgcct cgctgtgggg cctggccgcc 1020
aacgggcagg ccggcgtgga gaacgtcctc gacatcctgc gcggcggcat cgactcggcg 1080
ctgctgggtc tgcgcaagac ctcgatcgcc gatctcgacc gtggcgacat cgtcatcccg 1140
gccggtttcg agcgcgccct cggcgtgccc gccgacagcg agaaaccgct caccaccgcg 1200
gatctcgtcc agtag 1215
<210> 2
<211> 404
<212> PRT
<213> Nocardia asteroides(Nocardia asteroides)
<400> 2
Met Asn Pro Trp Phe Glu Thr Val Ala Glu Ala Gln Arg Arg Ala Arg
1 5 10 15
Lys Arg Leu Pro Lys Ser Val Tyr Gly Ala Leu Ile Ala Gly Ser Glu
20 25 30
Arg Gly Gln Thr Ile Glu Asp Asn Gln Ala Ala Phe Thr Glu Leu Gly
35 40 45
Phe Ala Pro His Cys Ala Gly Pro Ile Gly Glu Arg Asp Gln Ser Thr
50 55 60
Thr Val Leu Gly Gln Gln Leu Ser Met Pro Val Met Ile Ser Pro Thr
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Gly Val Gln Ala Val His Pro Asp Gly Glu Val Ala Val Ala Arg Ala
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Ala Ala Ala Arg Gly Ile Ala Met Gly Leu Ser Ser Phe Ala Ser Lys
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Pro Ile Glu Glu Val Val Ala Ala Asn Pro Ser Thr Leu Phe Gln Leu
115 120 125
Tyr Trp Cys Gly Asn Lys Asp Gln Ile Leu Glu Arg Met Ala Arg Ala
130 135 140
Lys Ala Ala Gly Ala Val Gly Leu Ile Leu Thr Leu Asp Trp Ser Phe
145 150 155 160
Ser His Gly Arg Asp Trp Gly Ser Pro Val Ile Pro Glu Ser Leu Asn
165 170 175
Leu Arg Thr Met Met Ser Phe Ala Pro Gln Thr Leu Ala Arg Pro Arg
180 185 190
Trp Leu Ala Thr Tyr Leu Arg Ser Gly Ser Ile Pro Asp Leu Thr Ala
195 200 205
Pro Asn Met Ala Val Gly Gly Gly Ala Ala Pro Gly Phe Phe Gly Ala
210 215 220
Tyr Gly Glu Trp Met Gln Thr Pro Ala Pro Asp Trp Asp Asp Val Ala
225 230 235 240
Trp Ile Cys Ala Gln Trp Asp Gly Pro Val Leu Leu Lys Gly Val Met
245 250 255
Arg Val Asp Asp Ala Leu Arg Ala Val Asp Ala Gly Val Ala Gly Ile
260 265 270
Ser Val Ser Asn His Gly Gly Asn Asn Leu Asp Gly Thr Pro Ala Ala
275 280 285
Ile Arg Ala Leu Pro Val Leu Ala Asp Ala Val Gly Asp Gln Ile Glu
290 295 300
Val Val Leu Asp Gly Gly Ile Arg Arg Gly Ser Asp Val Val Lys Ala
305 310 315 320
Val Ala Leu Gly Ala Arg Ala Val Leu Ile Gly Arg Ala Ser Leu Trp
325 330 335
Gly Leu Ala Ala Asn Gly Gln Ala Gly Val Glu Asn Val Leu Asp Ile
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Leu Arg Gly Gly Ile Asp Ser Ala Leu Leu Gly Leu Arg Lys Thr Ser
355 360 365
Ile Ala Asp Leu Asp Arg Gly Asp Ile Val Ile Pro Ala Gly Phe Glu
370 375 380
Arg Ala Leu Gly Val Pro Ala Asp Ser Glu Lys Pro Leu Thr Thr Ala
385 390 395 400
Asp Leu Val Gln
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<213> Artificial Sequence (Artificial Sequence)
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<213> Saccharomyces cerevisiae
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Met Ser Phe His Gln Gln Phe Phe Thr Leu Asn Asn Gly Asn Lys Ile
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Pro Ala Ile Ala Ile Ile Gly Thr Gly Thr Arg Trp Tyr Lys Asn Glu
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Glu Thr Asp Ala Thr Phe Ser Asn Ser Leu Val Glu Gln Ile Val Tyr
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Ala Leu Lys Leu Pro Gly Ile Ile His Ile Asp Ala Ala Glu Ile Tyr
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Arg Thr Tyr Pro Glu Val Gly Lys Ala Leu Ser Leu Thr Glu Lys Pro
65 70 75 80
Arg Asn Ala Ile Phe Leu Thr Asp Lys Tyr Ser Pro Gln Ile Lys Met
85 90 95
Ser Asp Ser Pro Ala Asp Gly Leu Asp Leu Ala Leu Lys Lys Met Gly
100 105 110
Thr Asp Tyr Val Asp Leu Tyr Leu Leu His Ser Pro Phe Val Ser Lys
115 120 125
Glu Val Asn Gly Leu Ser Leu Glu Glu Ala Trp Lys Asp Met Glu Gln
130 135 140
Leu Tyr Lys Ser Gly Lys Ala Lys Asn Ile Gly Val Ser Asn Phe Ala
145 150 155 160
Val Glu Asp Leu Gln Arg Ile Leu Lys Val Ala Glu Val Lys Pro Gln
165 170 175
Val Asn Gln Ile Glu Phe Ser Pro Phe Leu Gln Asn Gln Thr Pro Gly
180 185 190
Ile Tyr Lys Phe Cys Gln Glu His Asp Ile Leu Val Glu Ala Tyr Ser
195 200 205
Pro Leu Gly Pro Leu Gln Lys Lys Thr Ala Gln Asp Asp Ser Gln Pro
210 215 220
Phe Phe Glu Tyr Val Lys Glu Leu Ser Glu Lys Tyr Ile Lys Ser Glu
225 230 235 240
Ala Gln Ile Ile Leu Arg Trp Val Thr Lys Arg Gly Val Leu Pro Val
245 250 255
Thr Thr Ser Ser Lys Pro Gln Arg Ile Ser Asp Ala Gln Asn Leu Phe
260 265 270
Ser Phe Asp Leu Thr Ala Glu Glu Val Asp Lys Ile Thr Glu Leu Gly
275 280 285
Leu Glu His Glu Pro Leu Arg Leu Tyr Trp Asn Lys Leu Tyr Gly Lys
290 295 300
Tyr Asn Tyr Ala Ala Gln Lys Val
305 310
<210> 5
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<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 5
atgggttata attctctgaa aggcaaagtc gcgattgtta ctggtggtag catgggcatt 60
ggcgaagcga tcatccgtcg ctatgcagaa gaaggcatgc gcgttgttat caactatcgt 120
agccatccgg aggaagccaa aaagatcgcc gaagatatta aacaggcagg tggtgaagcc 180
ctgaccgtcc agggtgacgt ttctaaagag gaagacatga tcaacctggt gaaacagact 240
gttgatcact tcggtcagct ggacgtcttt gtgaacaacg ctggcgttga gatgccttct 300
ccgtcccacg aaatgtccct ggaagactgg cagaaagtga tcgatgttaa tctgacgggt 360
gcgttcctgg gcgctcgtga agctctgaaa tacttcgttg aacataacgt gaaaggcaac 420
attatcaata tgtctagcgt ccacgaaatc atcccgtggc ctactttcgt acattacgct 480
gcttctaagg gtggcgttaa actgatgacc cagactctgg ctatggaata tgcaccgaaa 540
ggtatccgca ttaacgctat cggtccaggc gcgatcaaca ctccaattaa tgcagaaaaa 600
ttcgaggatc cgaaacagcg tgcagacgtg gaaagcatga tcccgatggg caacatcggc 660
aagccagagg agatttccgc tgtcgcggca tggctggctt ctgacgaagc gtcttacgtt 720
accggcatca ccctgttcgc agatggtggc atgaccctgt acccgagctt tcaggctggc 780
cgtggttga 789
<210> 6
<211> 262
<212> PRT
<213> Microbacterium (Exiguobacterium sibiricum)
<400> 6
Met Gly Tyr Asn Ser Leu Lys Gly Lys Val Ala Ile Val Thr Gly Gly
1 5 10 15
Ser Met Gly Ile Gly Glu Ala Ile Ile Arg Arg Tyr Ala Glu Glu Gly
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Met Arg Val Val Ile Asn Tyr Arg Ser His Pro Glu Glu Ala Lys Lys
35 40 45
Ile Ala Glu Asp Ile Lys Gln Ala Gly Gly Glu Ala Leu Thr Val Gln
50 55 60
Gly Asp Val Ser Lys Glu Glu Asp Met Ile Asn Leu Val Lys Gln Thr
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Val Asp His Phe Gly Gln Leu Asp Val Phe Val Asn Asn Ala Gly Val
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Glu Met Pro Ser Pro Ser His Glu Met Ser Leu Glu Asp Trp Gln Lys
100 105 110
Val Ile Asp Val Asn Leu Thr Gly Ala Phe Leu Gly Ala Arg Glu Ala
115 120 125
Leu Lys Tyr Phe Val Glu His Asn Val Lys Gly Asn Ile Ile Asn Met
130 135 140
Ser Ser Val His Glu Ile Ile Pro Trp Pro Thr Phe Val His Tyr Ala
145 150 155 160
Ala Ser Lys Gly Gly Val Lys Leu Met Thr Gln Thr Leu Ala Met Glu
165 170 175
Tyr Ala Pro Lys Gly Ile Arg Ile Asn Ala Ile Gly Pro Gly Ala Ile
180 185 190
Asn Thr Pro Ile Asn Ala Glu Lys Phe Glu Asp Pro Lys Gln Arg Ala
195 200 205
Asp Val Glu Ser Met Ile Pro Met Gly Asn Ile Gly Lys Pro Glu Glu
210 215 220
Ile Ser Ala Val Ala Ala Trp Leu Ala Ser Asp Glu Ala Ser Tyr Val
225 230 235 240
Thr Gly Ile Thr Leu Phe Ala Asp Gly Gly Met Thr Leu Tyr Pro Ser
245 250 255
Phe Gln Ala Gly Arg Gly
260
<210> 7
<211> 939
<212> DNA
<213> Artificial Sequence (Artificial Sequence)
<400> 7
atgtcatttc accaacagtt ctttaccttg aataatggaa ataaaatccc cgcaatcgcc 60
atcattggga caggtactag atggtataaa aacgaagaaa cggatgctac cttttcgaac 120
agtttggtcg aacagattgt ttatgctctg aagttacctg gcattattca cattgatgct 180
gctgagatct acagaacata tccagaagtt gggaaggcac ttagcctcac cgaaaaacca 240
agaaatgcaa tattcttgac agacaagtac tcacctcaaa tcaagatgtc agattcccca 300
gcggatggac tagatttagc tttgaagaag atgggcactg actatgtcga tctatacctt 360
ttgcatagcc catttgtttc caaagaggtc aacgggttaa gtttggagga agcctggaag 420
gacatggagc aattgtacaa atcaggtaaa gctaaaaata tcggtgtttc caactttgct 480
gtggaagact tgcaaagaat tctgaaagtt gcggaagtca agccccaagt taatcaaatt 540
gagttcagtc ccttcttgca gaatcaaaca ccagggatct acaaattttg ccaagaacat 600
gatatattgg tagaagcata ctcgccacta ggtcccttac aaaagaaaac agcacaagat 660
gactctcaac cgtttttcga atacgtgaaa gagttatccg agaaatatat caaatctgaa 720
gcccaaatta tcctacgttg ggtgaccaaa cgtggcgtgt tgcctgtaac cacctcttcc 780
aaacctcaaa gaatttctga cgcgcaaaat ttattctctt tcgacttgac ggctgaggaa 840
gtcgataaga taacggagtt gggcttggaa catgaaccgc taagattgta ttggaataaa 900
ttgtacggta aatacaacta cgctgctcaa aaagtataa 939

Claims (13)

  1. Use of an L-pantolactone dehydrogenase in the catalysis of L-pantolactone to D-pantolactone, characterized in that the L-pantolactone dehydrogenase is derived fromNocardia asteroidesThe amino acid sequence is shown in SEQ ID No. 2.
  2. 2. The use according to claim 1, wherein the nucleotide sequence of the polynucleotide encoding the L-pantoate lactone dehydrogenase of claim 1 is the nucleotide sequence shown in SEQ ID No. 1.
  3. 3. A multienzyme recombinant cell which induces the production of the L-pantolactone dehydrogenase of claim 1 and D-ketopantolactone reductase;
    the L-pantolactone dehydrogenase is derived fromNocardia asteroidesAmino acids thereofThe sequence is shown as SEQ ID No. 2;
    the D-ketopantolactone reductase is derived from saccharomyces cerevisiae, and the amino acid sequence of the D-ketopantolactone reductase is shown as SEQ ID No. 4;
    the recombinant cell is a non-plant variety.
  4. 4. The multi-enzyme recombinant cell according to claim 3, wherein the polynucleotide sequence encoding the D-ketopantolactone reductase is the nucleotide sequence set forth in SEQ ID No. 3.
  5. 5. The multi-enzyme recombinant cell of claim 3, wherein the multi-enzyme recombinant cell further induces production of glucose dehydrogenase.
  6. 6. The multienzyme recombinant cell according to claim 5, wherein the glucose dehydrogenase is derived from Microbacterium, and the amino acid sequence thereof is represented by SEQ ID No. 6.
  7. 7. The multienzyme recombinant cell according to claim 6, wherein the polynucleotide sequence encoding the glucose dehydrogenase is the nucleotide sequence shown in SEQ ID No. 5.
  8. 8. A method for constructing a multienzyme recombinant cell, comprising:
    firstly, inserting the polynucleotide of claim 2 into a first vector to obtain a first recombinant vector; inserting the polynucleotide of claim 4 into a second vector to provide a second recombinant vector; and
    and step two, introducing the first recombinant vector and the second recombinant vector into a host cell to obtain the multienzyme recombinant cell.
  9. 9. The method according to claim 8, wherein in the first step, the polynucleotides according to claim 4 and claim 7 are inserted into a second vector, respectively, to obtain a second recombinant vector.
  10. 10. The method of claim 8 or 9, wherein the first vector is pET-28b, the second vector is pacycdue-1, and the host cell is pacycdue-1E. coli BL21(DE3)。
  11. 11. A method for preparing D-pantolactone is characterized in that L-pantolactone dehydrogenase and D-ketopantolactone reductase which are induced by multienzyme recombinant cells are utilized to catalyze L-pantolactone to generate D-pantolactone;
    the L-pantolactone dehydrogenase is derived fromNocardia asteroidesThe amino acid sequence is shown as SEQ ID No. 2;
    the D-ketopantolactone reductase is derived from saccharomyces cerevisiae, and the amino acid sequence of the D-ketopantolactone reductase is shown in SEQ ID No. 4.
  12. 12. The method of claim 11, wherein the multi-enzyme recombinant cell further induces production of glucose dehydrogenase using glucose as a co-substrate, and NADP in the continuous catalytic reaction system using the glucose dehydrogenase+Converted into NADPH.
  13. 13. The method of claim 11, wherein the method further comprises: separating D-pantoic acid lactone from the reaction system after the reaction.
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