Purification and Characterization of a Novel (S)-Enantioselective Transaminase from Pseudomonas fluorescens KNK08-18 for the Synthesis of Optically Active Amines

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概要

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• Pseudomonas fluorescens KNK08-18, showing (S)-selective transaminase activity, was isolated from soil by an enrichment culture method using (S)-7-methoxy-2-aminotetraline as the main nitrogen source. A transaminase was purified from the strain to homogeneity in seven steps. The relative mass of the enzyme was estimated to be 53 kDa on SDS-polyacrylamide gel electrophoresis and 120 kDa by gel filtration, suggesting a homodimeric structure. The optimal pH and temperature for enzyme activity were about 8.0–8.5 and 40 °C. The purified enzyme produced (S)-7-methoxy-2-aminotetraline, (S)-SMA, from 7-methoxy-2-tetralone (SMT) with high enantioselectivity. Although (S)-1-phenylethylamine was the best amino donor, β-alanine and 4-aminobutyric acid, which are good substrates for typical ω-amino acid transaminase (EC 2.6.1.18) and GABA transaminase (2.6.1.19), were not reacted. It aminated a broad range of carbonyl compounds containing aromatic, non-aromatic, and acidic and non-acidic substrates.

著者

• Kawano Shigeru

  Frontier Biochemical And Medicinal Res. Laboratories Kaneka Corp.

• HASEGAWA Junzo

  Frontier Biochemical and Medicinal Research Laboratories, Kaneka Corporation

• YASOHARA Yoshihiko

  Frontier Biochemical and Medicinal Research Laboratories, Kaneka Corporation

• ITO Noriyuki

  Frontier Biochemical and Medical Research Laboratories, Kaneka Corporation

関連論文

• Purification and Characterization of an NADH-Dependent Alcohol Dehydrogenase from Candida maris for the Synthesis of Optically Active 1-(Pyridyl)ethanol Derivatives
• Purification and Characterization of a Novel (S)-Enantioselective Transaminase from Pseudomonas fluorescens KNK08-18 for the Synthesis of Optically Active Amines
• Purification and Characterization of an NADH-Dependent Alcohol Dehydrogenase from Candida maris for the Synthesis of Optically Active 1-(Pyridyl)ethanol Derivatives
• Cloning and Overexpression of an NADH-Dependent Alcohol Dehydrogenase Gene from Candida maris Involved in (R)-Selective Reduction of 5-Acetylfuro[2,3-c]pyridine
• Purification and Characterization of a Novel (S)-Enantioselective Transaminase from Pseudomonas fluorescens KNK08-18 for the Synthesis of Optically Active Amines
• Cloning and Overexpression of an NADH-Dependent Alcohol Dehydrogenase Gene from Candida maris Involved in (R)-Selective Reduction of 5-Acetylfuro[2,3-c]pyridine
• Efficient Preparation of (R)-3-Hydroxypentanenitrile with High Enantiomeric Excess by Enzymatic Reduction with Subsequent Enhancement of the Optical Purity by Lipase-Catalyzed Ester Hydrolysis

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