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. 1996 Feb;62(2):570–577. doi: 10.1128/aem.62.2.570-577.1996

The peptide synthetase gene phsA from Streptomyces viridochromogenes is not juxtaposed with other genes involved in nonribosomal biosynthesis of peptides.

D Schwartz 1, R Alijah 1, B Nussbaumer 1, S Pelzer 1, W Wohlleben 1
PMCID: PMC167821  PMID: 8593056

Abstract

By complementation of a previously described non-phosphinothricin tripeptide (PTT)-producing mutant, NTG1, which is blocked in nonribosomal synthesis of the peptide, a DNA fragment including the putative peptide synthetase gene phsA was isolated (W. Wohlleben, R. Alijah, J. Dorendorf, D. Hillemann, B. Nussbaumer, and S. Pelzer, Gene 115:127-132, 1992). Sequence analysis of phsA revealed that it encodes a protein of 622 amino acids with regions which are highly similar to core motifs characteristic for peptide synthetases. PhsA represents one functional domain of a peptide synthetase which is necessary for activation and condensation of one amino acid, probably N-acetyl-demethyl-phosphinothricin. With regard to the arrangement of the flanking genes, phsA is the first peptide synthetase gene which is not in the direct neighborhood of additional peptide synthetase genes involved in the formation of peptide antibiotics. Gene disruption mutants with internal fragments of phsA subcloned in temperature-sensitive pGM vectors were generated. Integration occurred either into the chromosomal copy of phsA or into a gene outside the known phsA locus, resulting in two classes of non-PTT-producing mutants. In cofeeding experiments the former phsA mutants showed the same phenotype as did NTG1, which confirmed participation of phsA in nonribosomal synthesis of PTT. A truncated phsA gene was overexpressed in Escherichia coli, and the resulting protein of 593 amino acids was purified for raising antibodies. By performing immunoblotting experiments, the expression of phsA could be detected in Streptomyces viridochromogenes Tü494 in the stationary-growth phase after 4 days of incubation.

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