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. 1987 Sep;169(9):3867–3872. doi: 10.1128/jb.169.9.3867-3872.1987

Cloning and nucleotide sequence of the penicillinase antirepressor gene penJ of Bacillus licheniformis.

T Imanaka, T Himeno, S Aiba
PMCID: PMC213679  PMID: 3040662

Abstract

The penicillinase antirepressor gene, penJ, of Bacillus licheniformis ATCC 9945a was cloned in Escherichia coli by using pMB9 as a vector plasmid. The penicillinase gene, penP, its repressor gene, penI, and penJ were encoded on the cloned 5.2-kilobase HindIII fragment of the recombinant plasmid pTTE71. The penJ open reading frame was composed of 1,803 bases and 601 amino acid residues (molecular weight, 68,388). A Shine-Dalgarno sequence was found 7 bases upstream from the translation start site. Since this sequence was located in the 3'-terminal region of the penI gene, penJ might be transcribed together with penI as a polycistronic mRNA from the penI promoter. Frameshift mutations of penJ were constructed in vitro from pTTE71, and the penJ mutant gene was introduced into B. licheniformis by chromosomal recombination. The transformant B. licheniformis U173 (penP+ penI+ penJ) turned out to be uninducible for penicillinase production, whereas the wild-type strain (penP+ penI+ penJ+) was inducible. Only when these three genes (penP, penI, and PenJ) were simultaneously subcloned in Bacillus subtilis did the plasmid carrier exhibit inducible penicillinase production, as did wild-type B. licheniformis. It was concluded that penJ is involved in the penicillinase induction. The regulation of penP expression by penI and penJ is discussed.

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Selected References

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