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. 1985 Jun;162(3):1120–1125. doi: 10.1128/jb.162.3.1120-1125.1985

Molecular cloning of an ornithine-activating fragment of the gramicidin S synthetase 2 gene from Bacillus brevis and its expression in Escherichia coli.

M Krause, M A Marahiel, H von Döhren, H Kleinkauf
PMCID: PMC215892  PMID: 3888956

Abstract

Partially digested chromosomal DNA of Bacillus brevis ATCC 9999, a producer of the cyclic peptide antibiotic gramicidin S, was ligated into the BamHI site of the Escherichia coli expression vector pUR2-Bam. The ligated molecules were used to transfer E. coli to ampicillin resistance. Of 5 X 10(3) colonies tested by in situ immunoassay for a cross-reaction with antibodies against the gramicidin S synthetase 2, 6 colonies were found to be immunoreactive. A clone designated MK2, which had a 3.9-kilobase insert of B. brevis DNA, directed in E. coli under the lac promoter control the synthesis of polypeptides that were cross-reactive with the antibody to the gramicidin S synthetase 2. Partial purification of the gene products by gel filtration revealed a major fraction with an approximate molecular weight of 140,000 and with specific ornithine-dependent ATP-32PPi and 2'-dATP-32PPi exchange activities. These unique activities of the gramicidin S synthetase 2 were not detected in the E. coli strain harboring the vector.

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Selected References

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