Purification, Characterization, and Gene Cloning of Glycerol Dehydrogenase from Hansenula ofunaensis, and Its Expression for Production of Optically Active Diol(MICROBIAL PHYSIOLOGY AND BIOTECHNOLOGY)
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概要
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Optically active alcohol is an important building block as a versatile chiral synthon for the asymmetric synthesis of pharmaceuticals and agrochemicals. We purified and characterized glycerol dehydrogenase from Hamenula ofunaensis and prepared optically active 1,2-octanediol using a recombinant Escherichia coli harboring the glycerol dehydrogenase gene. The deduced amino acid sequence was investigated for identities with those of other alcohol dehydrogenases in the NCBI databank. The identification of the unknown product of a resting-cell reaction was performed by GC-MS. In the deduced amino acid sequence composed of 376 residues, the NAD(H) binding pattern and cysteine residues that correspond to the cysteine ligands at the zinc atom were conserved as they are in alcohol dehydrogenases from other origins. Glycerol dehydrogenase from Hansenula polymorpha DL-1 (Pichia angusta, DDBJ/EMBL/GenBank accession no. BAD32688) had the highest identity to our enzyme, showing 73% identity. Our glycerol dehydrogenase catalyzed the NAD^+-dependent oxidation of long-chain secondary alcohols such as 1,2-pentanediol, 1,2-hexanediol, 1,2-heptanediol, and 1,2-octanediol. Activities toward 2,4-pentanediol and 2,5-hexanediol were hardly detected. From these results, it was confirmed that our enzyme requires two hydroxyl groups on adjacent carbon atoms for oxidation. 2,3-Pentanedione, 2,3-hexanedione, and 3,4-hexanedione were significantly reduced. The transformants oxidized only (R)-1,2-octanediol in 50mM racemate (R:S=52:48), and produced (S)-1,2-octanediol (24mM, >99.9% e.e.) after 24h of incubation. The reaction product was suggested to be 1-hydroxy-2-octanone by GC-MS, which showed secondary hydroxyl groups oxidized. Glycerol dehydrogenase from H. ofunaensis could be useful for the production of long-chain optically active secondary alcohols.
- 2006-12-25
著者
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Yamada-Onodera Keiko
Graduate School of Biological Sciences, Nara Institute of Science and Technology
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Nakajima Akira
Graduate School of Biological Sciences, Nara Institute of Science and Technology
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Tani Yoshiki
Graduate School of Biological Sciences, Nara Institute of Science and Technology
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Tani Yoshiki
Faculty Of Bioenvironmental Science Kyoto Gakuen
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Yamada(onodera) Keiko
Graduate School Of Biological Sciences Nara Institute Of Science And Technology
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Yamada-onodera Keiko
Graduate School Of Biological Sciences Nara Institute Of Science And Technology
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Nakajima Akira
Graduate School Of Biological Sciences Nara Institute Of Science And Technology
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Tani Yoshiki
Graduate School Of Biological Sciences Advanced Institute Of Science And Technology
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Yamada-onodera Keiko
Graduate School Of Biological Sciences Nara Inst. Of Sci. And Technol.
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