Gluconobacter oxydans 2-ketoreductase enzyme and applications thereof

a technology of gluconobacter oxydans and ketoneductase, applied in the field of 2ketoneductase, can solve the problem that the large-scale synthesis of s-(+)-2-pentanol requires a large cell mass

Inactive Publication Date: 2006-12-28
NANDURI VENKATA +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, large-scale synthesis of S-(+)-2-pentanol requires a large cell mass, i.e., a ratio of 2-pentanone to cell mass of 1 kg:50 kg.

Method used

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  • Gluconobacter oxydans 2-ketoreductase enzyme and applications thereof
  • Gluconobacter oxydans 2-ketoreductase enzyme and applications thereof
  • Gluconobacter oxydans 2-ketoreductase enzyme and applications thereof

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embodiments

[0121] This invention encompasses, but is not limited to, the following embodiments: [0122] An isolated nucleic acid comprising a nucleotide sequence encoding amino acid sequence SEQ ID NO:2. [0123] An isolated nucleic acid comprising a nucleotide sequence encoding at least 12 contiguous residues of amino acid sequence SEQ ID NO:2. [0124] An isolated nucleic acid comprising a nucleotide sequence encoding at least 12 contiguous residues of the short chain dehydrogenase domain of amino acid sequence SEQ ID NO:2. [0125] An isolated nucleic acid comprising nucleotide sequence SEQ ID NO:1. [0126] An isolated nucleic acid comprising at least 21 contiguous nucleotides of nucleotide sequence SEQ ID NO:1. [0127] An isolated nucleic acid comprising a nucleotide sequence which is at least 54% identical to nucleotide sequence SEQ ID NO:1. [0128] An isolated nucleic acid comprising a nucleotide sequence which is complementary to a nucleotide sequence of the invention (above). [0129] A vector com...

example 1

Purification of G. Oxydans 2-Ketoreductase

[0183] Fermentation: Gluconobacter oxydans (SC13851) was grown on a glycerol-containing medium as follows. Cultures were grown in 500 ml Erlenmeyer flasks for 24 hr in 100 ml medium A (5% glycerol, 0.5% yeast extract, 0.05% ammonium sulfate, 0.3% peptone, 0.05% K2HPO4, 0.02% MgSO4.7H2O, 0.001% NaCl, 0.001% FeSO4.7H2O, and 0.001% MnSO4.7H2O). After 24 hr, the flask cultures were used to inoculate (1% v / v inoculum) a 15 L fermentor containing medium A. The fermentation was carried out at 28° C. for 24 hr. A 4000 L fermentor (Expend Industries, Inc., Brooklyn, N.Y.) was inoculated with 10 L inoculum from the 15 L fermentor. The 4000 L fermentor contained medium A with 0.05% antifoam SAG 5693. The fermentor was operated at 28° C., 100 LPM airflow, 690 mbar pressure, and 620 rpm agitation for 48 hr.

[0184] Cell recovery: The fermentor broth was cooled to 8° C. at the harvest. The tank was pressurized to 15 psig and broth was diverted to a Sharpl...

example 2

Analysis of Purified G. Oxydans 2-Ketoreductase

[0189] Protein assay: The Bio-Rad protein assay was used to determine protein concentration. The assay was performed according to the manufacturer's protocol (Bio-Rad). Samples containing 1-10 μl of enzyme fraction were brought to a volume of 0.8 ml with water. Next, 0.2 ml of the Bio-Rad reagent was added to the 0.8 ml sample solution. This was mixed thoroughly. The absorbance of the solution was measured at 595 nm. The protein concentration (mg / ml) was calculated from the standard curve using bovine serum albumin as standard protein.

[0190] Enzyme activity units: One unit (U) of enzyme activity was defined as one micromole of S-2-pentanol formed in 1 hr under the conditions described above. Results from the protein analysis of G. oxydans 2-ketoreductase are summarized below.

TABLE 1Enzyme ActivitySp. ActivityS-2-PentanolStepsVolume (mL)(Units)Protein (mg)(Units / mg)(e e)Purification FoldCell extract300390.00729.000.501.00DEAE Cellulo...

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Abstract

This invention relates to an novel Gluconobacter oxydans 2-ketoreductase useful for the synthesis of chiral alcohols. Also related are isolated nucleic acids encoding G. oxydans 2-ketoreductase enzymes, and enzyme fragments and variants thereof, as well as vectors and host cells comprising these nucleic acids. Further related are isolated G. oxydans 2-ketoreductase polypeptides, and fragments and variants thereof, and antibodies that specifically bind to G. oxydans 2-ketoreductase polypeptides, fragments, or variants. The invention also relates to methods of obtaining isolated G. oxydans 2-ketoreductase nucleic acids, polypeptides, and antibodies, and methods of using G. oxydans 2-ketoreductase in various reactions for industrial or pharmaceutical applications.

Description

[0001] This invention claims priority from provisional U.S. application Ser. No. 60 / 341,933 filed Dec. 19, 2001, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION [0002] This invention relates to a novel 2-ketoreductase isolated from Gluconobacter oxydans which catalyzes the reduction of 2-pentanone to S-(+)-2-pentanol. The invention also relates to isolated nucleic acids comprising nucleotide sequences that encode G. oxydans 2-ketoreductase polypeptides. Also related are vectors and host cells comprising these nucleic acids, isolated G. oxydans 2-ketoreductase polypeptides (e.g., recombinant polypeptides), and antibodies that specifically bind to G. oxydans 2-ketoreductase polypeptides. The invention further relates to methods of obtaining isolated G. oxydans 2-ketoreductase nucleic acids, polypeptides, and antibodies, and methods of using G. oxydans 2-ketoreductase in reactions required for the synthesis of industrial or pharmaceutical compounds. BAC...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12P7/02C12P21/06C07H21/04C12N1/21C12N15/74C12N9/02C12Q1/26C12Q1/32
CPCC12N9/0004G01N2333/04C12Q1/32C12Q1/26
Inventor NANDURI, VENKATAJOHNSTON, ROBERTGOLDBERG, STEVENCINO, PAULPATEL, RAMESH
Owner NANDURI VENKATA
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