Sequence analysis of a gene cluster involved in metabolism of 2,4,5-trichlorophenoxyacetic acid by Burkholderia cepacia AC1100.

Applied and Environmental Microbiology
D L DaubarasA M Chakrabarty

Abstract

Burkholderia cepacia AC1100 utilizes 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) as a sole source of carbon and energy. PT88 is a chromosomal deletion mutant of B. cepacia AC1100 and is unable to grow on 2,4,5-T. The nucleotide sequence of a 5.5-kb chromosomal fragment from B. cepacia AC1100 which complemented PT88 for growth on 2,4,5-T was determined. The sequence revealed the presence of six open reading frames, designated ORF1 to ORF6. Five polypeptides were produced when this DNA region was under control of the T7 promoter in Escherichia coli; however, no polypeptide was produced from the fourth open reading frame, ORF4. Homology searches of protein sequence databases were performed to determine if the proteins involved in 2,4,5-T metabolism were similar to other biodegradative enzymes. In addition, complementation studies were used to determine which genes were essential for the metabolism of 2,4,5-T. The first gene of the cluster, ORF1, encoded a 37-kDa polypeptide which was essential for complementation of PT88 and showed significant homology to putative trans-chlorodienelactone isomerases. The next gene, ORF2, was necessary for complementation and encoded a 47-kDa protein which showed homology to glutathione reductases....Continue Reading

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