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© A. Chauhan, JM Ghigo, C. Beloin.
Biofilm formation by Pseudomonas aeruginosa bacteria in Central Venous Catheter. Bacteria are stained in yellow and blood cells in red.
Publication : Molecular and General Genetics

Characterization of an lrp-like (lrpC) gene from Bacillus subtilis

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular and General Genetics - 01 Sep 1997

Beloin C, Ayora S, Exley R, Hirschbein L, Ogasawara N, Kasahara Y, Alonso JC, Hégarat FL.

Link to Pubmed [PMID] – 9341680

Mol Gen Genet. 1997 Sep;256(1):63-71.

In the course of the Bacillus subtilis genome sequencing project, we identified an open reading frame encoding a putative 16.4 kDa protein. This protein shows, respectively, 34% and 25% identity with the Escherichia coli regulatory proteins Lrp and AsnC. Phylogenetic analysis suggests that it represents a new group in the AsnC-Lrp family. Sequence comparisons, as well as immunodetection experiments, lead to the conclusion that the product of this B. subtilis lrp-like-gene is a bona fide Lrp protein-the first one to be detected in gram-positive bacteria. When expressed in E. coli, the B. subtilis Lrp-like protein is able to repress, by about two-fold, the expression of the ilvIH operon which is normally regulated by E. coli Lrp, indicating functional similarity in their regulatory targets. Vegetative growth of a B. subtilis lrp-like mutant is not affected in rich medium. However, the lrp-like mutation causes a transitory inhibition of growth in minimal medium in the presence of valine and isoleucine, which is relieved by leucine. This points to a possible role in regulation of amino acid metabolism. In addition, sporogenesis occurs earlier in the lrp-like mutant than in the reference strain, implying that the B subtilis Lrp-like protein plays a role in the growth phase transition.

http://www.ncbi.nlm.nih.gov/pubmed/9341680