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. 1981 Sep;147(3):776–786. doi: 10.1128/jb.147.3.776-786.1981

Cloning of the genes for penicillinase, penP and penI, of Bacillus licheniformis in some vector plasmids and their expression in Escherichia coli, Bacillus subtilis, and Bacillus licheniformis.

T Imanaka, T Tanaka, H Tsunekawa, S Aiba
PMCID: PMC216113  PMID: 6268607

Abstract

By using plasmid pMB9, penicillinase genes (penP and penI) from both the wild-type and constitutive strains of Bacillus licheniformis 9945A were cloned in EScherichia coli. When a low-copy-number plasmid was used, both wild-type and constitutive penicillinase genes could be transferred into Bacillus subtilis. However, when a high-copy-number plasmid was used, only the genes of the wild type could be transferred. These recombinant plasmids in B. subtilis could all be transferred by the protoplast transformation procedure into B. licheniformis. Transformants of E. coli were resistant to ampicillin (20 micrograms/ml) in spite of the low penicillinase activities (7 U/mg of cells). However, transformants of B. subtilis and B. licheniformis were sensitive to ampicillin (20 micrograms/ml) even in high penicillinase activities (more than 10,000 U/mg of cells). The secretion of penicillinase was rarely observed in E. coli. In contrast, penicillinases secreted from transformants of B. subtilis and B. licheniformis were around 30 and 60% of the total activities, respectively. We took advantage of the plasmids to permit the construction of hetero- and mero-polyploid structures in host cells, and we discuss a regulatory mechanism of penicillinase synthesis in B. licheniformis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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