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Applied and Environmental Microbiology, October 1999, p. 4399-4403, Vol. 65, No. 10
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Purification and Characterization of Monovalent Cation-Activated Levodione Reductase from Corynebacterium aquaticum M-13

Masaru Wada,^1,* Ayumi Yoshizumi,¹ Shigeru Nakamori,¹ and Sakayu Shimizu²

Department of Bioscience, Fukui Prefectural University, 4-1-1 Kenjyojima, Fukui 910-1195,¹ and Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502,² Japan

Received 24 May 1999/Accepted 20 July 1999

(6R)-2,2,6-Trimethyl-1,4-cyclohexanedione (levodione) reductase was isolated from a cell extract of the soil isolate Corynebacterium aquaticum M-13. This enzyme catalyzed regio- and stereoselective reduction of levodione to (4R,6R)-4-hydroxy-2,2,6-trimethylcyclohexanone (actinol). The relative molecular mass of the enzyme was estimated to be 142,000 Da by high-performance gel permeation chromatography and 36,000 Da by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The enzyme required NAD⁺ or NADH as a cofactor, and it catalyzed reversible oxidoreduction between actinol and levodione. The enzyme was highly activated by monovalent cations, such as K⁺, Na⁺, and NH₄⁺. The NH₂-terminal and partial amino acid sequences of the enzyme showed that it belongs to the short-chain alcohol dehydrogenase/reductase family. This is the first report of levodione reductase.

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^* Corresponding author. Mailing address: Department of Bioscience, Fukui Prefectural University, 4-1-1 Kenjyojima, Matsuoka-cho, Fukui 910-1195, Japan. Phone: 81-776-61-6000. Fax: 81-776-61-6015. E-mail: masaru{at}fpu.ac.jp.

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Applied and Environmental Microbiology, October 1999, p. 4399-4403, Vol. 65, No. 10
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

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