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Cloning and characterization of a cyclohexanone monooxygenase gene from Arthrobacter sp. L661

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Abstract

Cyclohexanone monooxygenase (CHMO), a type of Baeyer-Villiger oxidation, catalyzes the oxidation of cyclohexanone into ɛ-caprolactone, which has been utilized as a building block in organic synthesis. A bacterium that is capable of growth on cyclohexanone as a sole carbon source was recently isolated and was identified as Arthrobacter sp. L661. The strain is believed to harbor a CHMO gene (chnB), considering the high degradablity of cyclohexanone. In order to characterize the CHMO, a chnB gene was cloned from Arthrobacter sp. L661. The deduced amino acids of the chnB gene evidenced the highest degree of homology (90% identity) with the CHMO of Arthrobacter sp. BP2 (accession no. AY123972). The CHMO of L661 was shown to be functionally expressed in Escherichia coli cells, purified via affinity chromatography, and characterized. The specific activity of the purified enzyme was 24.75 μmol/min/mg protein. The optimum pH was 7.0 and the enzyme maintained over 70% of its activity for up to 24 h in a pH range of 6.0 to 8.0 at 4°C. The CHMO of L661 readily oxidized cyclobutanone and cyclopentanone whereas less activity was detected with those of Arthrobacter sp. BP2, Rhodococcus sp. Phi1, and Rhodococcus sp. Phi2, thereby suggesting that the CHMO of L661 evidenced the different substrate specificities compared with other CHMOs. These results can provide us with useful information for the development of biocatalysts applicable to commercial organic syntheses, especially because only a few CHMO genes have been identified thus far.

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Authors and Affiliations

  1. Department of Food Science and Technology, Pukyong National University, Busan, 608-737, Korea

    Young-Mog Kim

  2. Department of Agricultural Chemistry, Kyungpook National University, Daegu, 702-701, Korea

    Soon-Hyun Jung & In-Koo Rhee

  3. Division of Environmental System Engineering, Pukyong National University, Busan, 608-737, Korea

    Yong-Hyun Chung

  4. Division of Food, Biological and Chemical Engineering, Daegu University, Gyeongsan, 712-714, Korea

    Choon-Bal Yu

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  1. Young-Mog Kim
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  5. In-Koo Rhee
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Correspondence to In-Koo Rhee.

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Kim, YM., Jung, SH., Chung, YH. et al. Cloning and characterization of a cyclohexanone monooxygenase gene from Arthrobacter sp. L661. Biotechnol Bioproc E 13, 40–47 (2008). https://doi.org/10.1007/s12257-007-0162-1

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  • DOI: https://doi.org/10.1007/s12257-007-0162-1

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