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Expression of the bglH gene of Lactobacillus plantarum is controlled by carbon catabolite repression.

ABSTRACT: A newly identified bglH gene coding for a phospho-beta-glucosidase of Lactobacillus plantarum was isolated and expressed in Escherichia coli. The sequence analysis of the cloned DNA fragment showed an open reading frame encoding a 480-amino-acid protein with a calculated molecular mass of 53 kDa. The bglH gene was shown to be expressed on a monocistronic transcriptional unit. Its transcription was repressed 10-fold in L. plantarum cells grown on glucose compared to the beta-glucoside salicin as a sole carbon source. A catabolite-responsive element (CRE) spanning from -3 to +11 with respect to the transcriptional start point was found, and its functionality was assessed by mutational analysis. In vitro and in vivo DNA binding experiments suggested the occurrence of a DNA-protein complex at the CRE site, which would mediate glucose repression of bglH expression.

SUBMITTER: Marasco R

PROVIDER: S-EPMC107296 | biostudies-literature | 1998 Jul

REPOSITORIES: biostudies-literature

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Expression of the bglH gene of Lactobacillus plantarum is controlled by carbon catabolite repression.

Marasco R R Muscariello L L Varcamonti M M De Felice M M Sacco M M

Journal of bacteriology 19980701 13

A newly identified bglH gene coding for a phospho-beta-glucosidase of Lactobacillus plantarum was isolated and expressed in Escherichia coli. The sequence analysis of the cloned DNA fragment showed an open reading frame encoding a 480-amino-acid protein with a calculated molecular mass of 53 kDa. The bglH gene was shown to be expressed on a monocistronic transcriptional unit. Its transcription was repressed 10-fold in L. plantarum cells grown on glucose compared to the beta-glucoside salicin as ...[more]

PMID: 9642194

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