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. 1989 Mar;171(3):1705–1711. doi: 10.1128/jb.171.3.1705-1711.1989

Molecular cloning and expression in Escherichia coli of the Bacillus licheniformis bacitracin synthetase 2 gene.

H Ishihara 1, N Hara 1, T Iwabuchi 1
PMCID: PMC209801  PMID: 2646292

Abstract

The structural genes for the entire bacitracin synthetase 2 (component II) and for a part of the putative bacitracin synthetase 3 (component III) from Bacillus licheniformis ATCC 10716 were cloned and expressed in Escherichia coli. A cosmid library of B. licheniformis DNA was constructed. The library was screened for the ability to produce bacitracin synthetase by in situ immunoassay using anti-bacitracin synthetase antiserum. A positive clone designated B-15, which has a recombinant plasmid carrying about a 32-kilobase insert of B. licheniformis DNA, was further characterized. Analysis of crude cell extract from B-15 by polyacrylamide gel electrophoresis and Western blotting (immunoblotting) showed that the extract contains two immunoreactant proteins with high molecular weight. One band with a molecular weight of about 240,000 comigrates with bacitracin synthetase 2; the other band is a protein with a molecular weight of about 300,000. Partial purification of the gene products encoded by the recombinant plasmid by gel filtration and hydroxyapatite column chromatography revealed that one gene product catalyzes L-lysine- and L-ornithine-dependent ATP-PPi exchange reactions which are characteristic of bacitracin synthetase 2, and the other product catalyzes L-isoleucine-, L-leucine, L-valine-, and L-histidine-dependent ATP-PPi exchange activities, suggesting the activities of a part of bacitracin synthetase 3. Subcloning experiments indicated that the structural gene for bacitracin synthetase 2 is located near the middle of the insert.

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Selected References

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