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. 1989 Apr;171(4):1885–1892. doi: 10.1128/jb.171.4.1885-1892.1989

Induction and metabolite regulation of levanase synthesis in Bacillus subtilis.

I Martin 1, M Debarbouille 1, A Klier 1, G Rapoport 1
PMCID: PMC209836  PMID: 2495266

Abstract

Levanase expression in Bacillus subtilis was studied by using transcriptional and translational fusions. It was shown that the degradative products of levan or inulin and low concentrations of fructose were able to induce levanase expression. In the wild-type strain and in a constitutive overproducing sacL mutant, levanase synthesis was repressed by glucose or fructose. This catabolite repression was partially abolished in the derepressed alpha-amylase gra-26 mutant. The levanase gene (sacC) appears to be the distal gene of an operon transcribed from a fructose-inducible promoter. Deletion mapping experiments and primer extension analysis revealed a transcriptional start point located 2.7 kilobases upstream from the sacC gene. Two constitutive sacL mutations were shown to be closely linked by transformation to the sacC gene. The sacL6 and sacL8 mutations were mapped in the promoter-proximal region of the operon.

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Selected References

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