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Applied and Environmental Microbiology, June 1999, p. 2789-2793, Vol. 65, No. 6
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Characterization of the meta-Cleavage Compound Hydrolase Gene Involved in Degradation of the Lignin-Related Biphenyl Structure by Sphingomonas paucimobilis SYK-6

Xue Peng,1 Eiji Masai,1 Yoshihiro Katayama,2 and Masao Fukuda1,*

Department of Bioengineering, Nagaoka University of Technology, Kamitomioka, Nagaoka, Niigata 940-2188,1 and Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509,2 Japan

Received 21 December 1998/Accepted 25 March 1999

Sphingomonas paucimobilis SYK-6 has the ability to transform a lignin-related biphenyl compound, 2,2'-dihydroxy-3,3'-dimethoxy-5,5'-dicarboxybiphenyl (DDVA), to 5-carboxyvanillic acid (5CVA) via 2,2',3-trihydroxy-3'-methoxy-5,5'-dicarboxybiphenyl (OH-DDVA). In the 4.9-kb HindIII fragment containing the OH-DDVA meta-cleavage dioxygenase gene (ligZ), we found a novel hydrolase gene (ligY) responsible for the conversion of the meta-cleavage compound of OH-DDVA to 5CVA. Incorporation of 18O from H218O into 5CVA indicated there was a hydrolytic conversion of the OH-DDVA meta-cleavage compound to 5CVA. LigY exhibited hydrolase activity only toward the meta-cleavage compound of OH-DDVA, suggesting its restricted substrate specificity.

* Corresponding author. Mailing address: Department of Bioengineering, Nagaoka University of Technology, Kamitomioka, Nagaoka, Niigata 940-2188, Japan. Phone: (81) 258 47 9405. Fax: (81) 258 47 9450. E-mail: masao{at}nagaokaut.ac.jp.

Applied and Environmental Microbiology, June 1999, p. 2789-2793, Vol. 65, No. 6
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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