Volume 253, Issue 2 pp. 237-242

Functional coupling between vanillate-O-demethylase and formaldehyde detoxification pathway

Makoto Hibi

Makoto Hibi

Biofrontier Laboratories, Kyowa Hakko Kogyo Co. Ltd., 3-6-6 Asahimachi, Machidashi, Tokyo 194-8533, Japan

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Tomonori Sonoki

Tomonori Sonoki

Biofrontier Laboratories, Kyowa Hakko Kogyo Co. Ltd., 3-6-6 Asahimachi, Machidashi, Tokyo 194-8533, Japan

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Hideo Mori

Corresponding Author

Hideo Mori

Biofrontier Laboratories, Kyowa Hakko Kogyo Co. Ltd., 3-6-6 Asahimachi, Machidashi, Tokyo 194-8533, Japan

*Corresponding author. Tel.: +81 42 726 2555; fax: +81 42 726 8330., E-mail address: [email protected]Search for more papers by this author
First published: 09 January 2006
Citations: 3

Edited by S. Silver

Abstract

Pseudomonas putida vanillate-O-demethylase consisting of VanA and VanB was expressed in Escherichia coli strain K-12. Recombinant E. coli strain K-12 cells expressing VanAB efficiently converted vanillate into protocatechuate with glucose consumption. Mutant lacking either pgi or zwf showed higher or lower converting activity than the parental strain, respectively. Formaldehyde, which is the by-product of the demethylation, was converted into formate in the cellular reaction. Formate accumulation was blocked by gene disruption of the E. coli frmA that coded glutathione-dependent formaldehyde dehydrogenase.

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