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Applied and Environmental Microbiology, May 1999, p. 2151-2162, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Cloning, Expression, and Nucleotide Sequence of the Pseudomonas aeruginosa 142 ohb Genes Coding for Oxygenolytic ortho Dehalogenation of Halobenzoates

Tamara V. Tsoi,1,2,* Elena G. Plotnikova,1,dagger James R. Cole,1,2 William F. Guerin,2 Michael Bagdasarian,1,3 and James M. Tiedje1,2,3

Center for Microbial Ecology,1 Department of Crop and Soil Sciences,2 and Department of Microbiology,3 Michigan State University, East Lansing, Michigan 48824

Received 25 September 1998/Accepted 18 February 1999

We have cloned and characterized novel oxygenolytic ortho-dehalogenation (ohb) genes from 2-chlorobenzoate (2-CBA)- and 2,4-dichlorobenzoate (2,4-dCBA)-degrading Pseudomonas aeruginosa 142. Among 3,700 Escherichia coli recombinants, two clones, DH5alpha F'(pOD22) and DH5alpha F'(pOD33), converted 2-CBA to catechol and 2,4-dCBA and 2,5-dCBA to 4-chlorocatechol. A subclone of pOD33, plasmid pE43, containing the 3,687-bp minimized ohb DNA region conferred to P. putida PB2440 the ability to grow on 2-CBA as a sole carbon source. Strain PB2440(pE43) also oxidized but did not grow on 2,4-dCBA, 2,5-dCBA, or 2,6-dCBA. Terminal oxidoreductase ISPOHB structural genes ohbA and ohbB, which encode polypeptides with molecular masses of 20,253 Da (beta -ISP) and 48,243 Da (alpha -ISP), respectively, were identified; these proteins are in accord with the 22- and 48-kDa (as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis) polypeptides synthesized in E. coli and P. aeruginosa parental strain 142. The ortho-halobenzoate 1,2-dioxygenase activity was manifested in the absence of ferredoxin and reductase genes, suggesting that the ISPOHB utilized electron transfer components provided by the heterologous hosts. ISPOHB formed a new phylogenetic cluster that includes aromatic oxygenases featuring atypical structural-functional organization and is distant from the other members of the family of primary aromatic oxygenases. A putative IclR-type regulatory gene (ohbR) was located upstream of the ohbAB genes. An open reading frame (ohbC) of unknown function that overlaps lengthwise with ohbB but is transcribed in the opposite direction was found. The ohbC gene codes for a 48,969-Da polypeptide, in accord with the 49-kDa protein detected in E. coli. The ohb genes are flanked by an IS1396-like sequence containing a putative gene for a 39,715-Da transposase A (tnpA) at positions 4731 to 5747 and a putative gene for a 45,247-Da DNA topoisomerase I/III (top) at positions 346 to 1563. The ohb DNA region is bordered by 14-bp imperfect inverted repeats at positions 56 to 69 and 5984 to 5997.

* Corresponding author. Mailing address: A540 Center for Microbial Ecology, Plant and Soil Sciences Building, Michigan State University, East Lansing, MI 48824-1325. Phone: (517) 432-1536. Fax: (517) 353-2917. E-mail: tsoi{at}pilot.msu.edu.

dagger Present address: Institute of Ecology and Genetics of Microorganisms, Russian Academy of Sciences, Ural Branch, Perm 614081, Russia.

Applied and Environmental Microbiology, May 1999, p. 2151-2162, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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