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. 1991 Jul;173(14):4454–4463. doi: 10.1128/jb.173.14.4454-4463.1991

Nucleotide sequence analysis reveals linked N-acetyl hydrolase, thioesterase, transport, and regulatory genes encoded by the bialaphos biosynthetic gene cluster of Streptomyces hygroscopicus.

A Raibaud 1, M Zalacain 1, T G Holt 1, R Tizard 1, C J Thompson 1
PMCID: PMC208109  PMID: 2066341

Abstract

Nucleotide sequence analysis of a 5,000-bp region of the bialaphos antibiotic production (bap) gene cluster defined five open reading frames (ORFs) which predicted structural genes in the order bah, ORF1, ORF2, and ORF3 followed by the regulatory gene, brpA (H. Anzai, T. Murakami, S. Imai, A. Satoh, K. Nagaoka, and C.J. Thompson, J. Bacteriol. 169:3482-3488, 1987). The four structural genes were translationally coupled and apparently cotranscribed from an undefined promoter(s) under the positive control of the brpA gene product. S1 mapping experiments indicated that brpA was transcribed by two promoters (brpAp1 and brpAp2) which initiate transcription 150 and 157 bp upstream of brp A within an intergenic region and at least one promoter further upstream within the bap gene cluster (brpAp3). All three transcripts were present at low levels during exponential growth and increased just before the stationary phase. The levels of the brpAp3 band continued to increase at the onset of stationary phase, whereas brpAp1-and brpAp2-protected fragments showed no further change. BrpA contained a possible helix-turn-helix motif at its C terminus which was similar to the C-terminal regulatory motif found in the receiver component of a family of two-component transcriptional activator proteins. This motif was not associated with the N-terminal domain conserved in other members of the family. The structural gene cluster sequenced began with bah, encoding a bialaphos acetylhydrolase which removes the N-acetyl group from bialaphos as one of the final steps in the biosynthetic pathway. The observation that Bah was similar to a rat and to a bacterial (Acinetobacter calcoaceticus) lipase probably reflects the fact that the ester bonds of triglycerides and the amide bond linking acetate to phosphinothricin are similar and hydrolysis is catalyzed by structurally related enzymes. This was followed by two regions encoding ORF1 and ORF2 which were similar to each other (48% nucleotide identity, 31% amino acid identity), as well as to GrsT, a protein encoded by a gene located adjacent to gramicidin S synthetase in Bacillus brevis, and to vertebrate (mallard duck and rat) thioesterases. The amino acid sequence and hydrophobicity profile of ORF3 indicated that it was related to a family of membrane transport proteins. It was strikingly similar to the citrate uptake protein encoded by the transposon Tn3411.

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Selected References

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