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. 1991 Oct;173(19):6018–6024. doi: 10.1128/jb.173.19.6018-6024.1991

Molecular cloning and sequence of the thdF gene, which is involved in thiophene and furan oxidation by Escherichia coli.

K Y Alam 1, D P Clark 1
PMCID: PMC208346  PMID: 1917835

Abstract

Our previous work resulted in the isolation of mutant strains of Escherichia coli K-12 which were able to oxidize furans and thiophenes as a result of mutations in several novel genes. Some of the genes involved in thiophene oxidation were cloned into the multicopy vector pUC19. The plasmid pKA10 carries a 3.8-kb chromosomal fragment which encodes a previously undiscovered gene involved in thiophene oxidation. Three proteins with approximate molecular sizes of 48, 30, and 26 kDa were overproduced by cells carrying pKA10. Maxicell experiments and DNA sequence analysis indicated that the 48- and 26-kDa proteins are encoded by pKA10, whereas the 30-kDa protein is apparently chromosomally derived. A cassette specifying kanamycin resistance was inserted into various sites on pKA10. An insertion which abolished the 48-kDa protein also abolished thiophene oxidation. Chromosomal integration of pKA10::Kan allowed us to locate the chromosomal insert of pKA10 at 84 min on the E. coli genetic map by transduction. Since no previously identified genes involved in thiophene metabolism are located in this region, we designated the gene for the 48-kDa protein as thdF. Sequencing of the 3.8-kb insert revealed an overlap of several hundred bases with the regulatory and structural regions of the tnaA gene, which is also located at 84 min. The 26-kDa protein is probably truncated tnaA protein. An open reading frame corresponding to the 48-kDa thdF protein was located next to the tnaA gene, which encodes tryptophanase, but was transcribed in the opposite sense.

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Selected References

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