Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Genetic Structure of xyl Gene Cluster Responsible for Complete Degradation of (4-Chloro )Benzoate from Pseudomonas sp. S-47

  • Park, Dong-Woo (Department of Microbiology and Biotechnology, Research Institute Chungbuk National University) ;
  • Lee, Kyoung (Department of Microbiology, Changwon National University) ;
  • Chae, Jong-Chan (Biotechnology Center for Agriculture and Environment, Rutgers University) ;
  • Kudo, Toshiaki (Laboratory of Microbiology, Institute of Physical and Chemical Research (RIKEN)) ;
  • Kim, Chi-Kyung (Department of Microbiology and Biotechnology, Research Institute Chungbuk National University)
  • Published : 2004.06.01
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Abstract

Pseudomonas sp. S-47 is a bacterium capable of degrading benzoate as well as 4-chlorobenzoate (4CBA). Benzoate and 4CBA are known to be degraded via a meta-cleavage pathway characterized by a series of enzymes encoded by xyl genes. The meta-cleavage pathway operon in Pseudomonas sp. S-47 encodes a set of enzymes which transform benzoate and 4CBA into TCA cycle intermediates via the meta-cleavage of (4-chloro )catechol to produce pyruvate and acetyl-CoA. In the current study, the meta-pathway gene cluster was cloned from the chromosomal DNA of S-47 strain to obtain pCS1, which included the degradation activities for 4CBA and catechol. The genetic organization of the operon was then examined by cloning the meta-pathway genes into a pBluescript SKII(+) vector. As such, the meta-pathway operon from Pseudomonas sp. S-47 was found to contain 13 genes in the order of xylXYZLTEGFlQKIH. The two regulatory genes, xylS and xylR, that control the expression of the meta-pathway operon, were located adjacently downstream of the meta-pathway operon. The xyl genes from strain S-47 exhibited a high nucleoside sequence homology to those from Pseudomonas putida mt-2, except for the xylJQK genes, which were more homologous to the corresponding three genes from P. stutzeri AN10. One open reading frame was found between the xylH and xylS genes, which may playa role of a transposase. Accordingly, the current results suggest that the xyl gene cluster in Pseudomonas sp. S-47 responsible for the complete degradation of benzoate was recombined with the corresponding genes from P. putida mt-2 and P. stutzeri AN10.

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