Identification of a Homolog of CcpA Catabolite Repressor Protein in Streptococcus mutans
AUTOR(ES)
Simpson, Christine L.
FONTE
American Society for Microbiology
RESUMO
A locus containing a gene with homology to ccpA of other bacteria has been cloned from Streptococcus mutans LT11, sequenced, and named regM. Upstream of the regM gene, on the opposite strand, is a gene encoding an X-Pro dipeptidase, pepQ. A 14-bp palindromic sequence with homology to the consensus catabolite-responsive element sequence lay in the promoter region between the two genes. To study the function of regM, the gene was inactivated by insertion of an antibiotic resistance marker. Diauxic growth of S. mutans on a number of sugars in the presence of glucose was not affected by disruption of regM. The loss of RegM increased glucose repression of α-galactosidase, mannitol-1-P dehydrogenase, and P-β-galactosidase activities. These results suggest that while RegM can affect catabolite repression in S. mutans, it does not conform to the model proposed for CcpA in Bacillus subtilis.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=108167Documentos Relacionados
- Role of RegM, a Homologue of the Catabolite Repressor Protein CcpA, in the Virulence of Streptococcus pneumoniae
- Mutations in Catabolite Control Protein CcpA Separating Growth Effects from Catabolite Repression
- NADP, corepressor for the Bacillus catabolite control protein CcpA
- A Homolog of CcpA Mediates Catabolite Control in Listeria monocytogenes but Not Carbon Source Regulation of Virulence Genes
- RegG, a CcpA Homolog, Participates in Regulation of Amylase-Binding Protein A Gene (abpA) Expression in Streptococcus gordonii