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Antimicrobial Agents and Chemotherapy, July 1999, p. 1792-1797, Vol. 43, No. 7
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Identification of a Novel beta -Lactamase Produced by Xanthomonas campestris, a Phytopathogenic Bacterium

Shu-Fen Weng,1,* Chun-Yi Chen,1 Yeong-Sheng Lee,1 Juey-Wen Lin,2 and Yi-Hsiung Tseng1

Institute of Molecular Biology1 and Institute of Biochemistry,2 National Chung Hsing University, Taichung 402, Taiwan, Republic of China

Received 19 October 1998/Returned for modification 2 February 1999/Accepted 27 April 1999

The Xanthomonas campestris pv. campestris 11 chromosome encodes a periplasmic beta -lactamase of 30 kDa. Gene replacement and complementation confirmed the presence of this enzyme. Its deduced amino acid sequence shows identity and conserved domains between it and Stenotrophomonas maltophilia L2 and other Ambler class A/Bush group 2 beta -lactamases. Southern hybridization detected a single homologous fragment in each of 12 other Xanthomonas strains, indicating that the presence of a beta -lactamase gene is common among xanthomonads.

* Corresponding author. Mailing address: Institute of Molecular Biology, National Chung Hsing University, Taichung 402, Taiwan, Republic of China. Phone: 886-4-285-1885. Fax: 886-4-287-4879. E-mail: sfweng{at}dragon.nchu.edu.tw.

Antimicrobial Agents and Chemotherapy, July 1999, p. 1792-1797, Vol. 43, No. 7
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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