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J Bacteriol. 1994 April; 176(8): 2348-2353

research-article

Analysis of duplicated gene sequences associated with tfdR and tfdS in Alcaligenes eutrophus JMP134.

Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater 74078.

ABSTRACT

Plasmid pJP4 of Alcaligenes eutrophus JMP134 encodes the degradation of 2,4-dichlorophenoxyacetic acid. A 1.2-kb BamHI-XhoI region of the restriction fragment BamHI-E has been proposed to contain the regulatory gene tfdR (A. R. Harker, R. H. Olsen, and R. J. Seidler, J. Bacteriol. 171:314-320, 1989; B. Kaphammer, J. J. Kukor, and R. H. Olsen, J. Bacteriol. 172:2280-2286, 1990). When sequenced and analyzed, the region is shown to contain two incomplete open reading frames (ORFs) positioned divergently. The complete DNA sequence for one of the two ORFs was obtained by sequencing the adjacent restriction fragment BamHI-F. The DNA sequence reveals 100% identify with the regulatory gene tfdS of pJP4. An XbaI-PstI fragment, containing the complete ORF, encodes a 32,000-Da protein which binds to the promoter regions upstream from tfdA and tfdDII. The deduced amino acid sequence of the complete ORF shows similarity with sequences of activator proteins TcbR, CatM, and CatR of the LysR family. The complete ORF represents the regulatory gene tfdR. The deduced amino acid sequence of the incomplete ORF, situated divergently from tfdR, indicates similarity to chloromuconate cycloisomerases produced by genes tfdD and tcbD of plasmids pJP4 and pP51, respectively. This ORF is identified as part of a putative isofunctional gene, tfdDII.

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