Regulation of Mannose Phosphotransferase System Permease and Virulence Gene Expression in Listeria monocytogenes by the EII t Man Transporter
| Autor: | Kurt W. Miller, Hung Vu-Khac |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Virulence Factors
Operon Catabolite repression Gene Expression Mannose Genetics and Molecular Biology Biology Models Biological Applied Microbiology and Biotechnology chemistry.chemical_compound Gene expression Gene cluster Humans Phosphoenolpyruvate Sugar Phosphotransferase System Regulator gene Regulation of gene expression Ecology Gene Expression Profiling Phosphotransferases Membrane Transport Proteins Gene Expression Regulation Bacterial PEP group translocation Listeria monocytogenes Molecular biology chemistry bacteria Gene Deletion Food Science Biotechnology |
| Zdroj: | Applied and Environmental Microbiology. 75:6671-6678 |
| ISSN: | 1098-5336 0099-2240 |
| DOI: | 10.1128/aem.01104-09 |
| Popis: | The EII t Man phosphotransferase system (PTS) permease encoded by the mpt operon is the principal glucose transporter in Listeria monocytogenes. EII t Man participates in glucose-mediated carbon catabolite repression (CCR) and downregulation of virulence gene expression, and it is the receptor for class IIa bacteriocins. The regulation of this important protein and its roles in gene control were examined using derivatives of strain EGD-e in which the mpt operon or its regulatory genes, manR and lmo0095, were deleted. Real-time reverse transcription-PCR analysis showed that the mpt mRNA level was 10- and 100-fold lower in the lmo0095 and manR deletion strains, respectively. The manR mRNA level was higher in the mpt deletion mutant in medium lacking glucose, possibly due to disruption of a regulatory process that normally downregulates manR transcription in the absence of this sugar. Analysis of the mpt deletion mutant also showed that EII t Man participates to various degrees in glucose-mediated CCR of PTS operons. CCR of the lmo0027 gene, which encodes a β-glucoside PTS transporter, required expression of EII t Man . In contrast, genes in two mannose PTS operons (lmo0024, lmo1997, and lmo2002) were repressed by glucose even when EII t Man was not synthesized. A third mannose PTS operon, mpo , was not regulated by glucose or by the level of EII t Man . Finally, the mRNA levels for five genes in the prfA virulence gene cluster were two- to fourfold higher in the mpt deletion mutant. The results show that EII t Man participates to various extents in glucose-mediated CCR of PTS operons and makes a small, albeit significant, contribution to downregulation of virulence gene transcription by glucose in strain EGD-e. |
| Databáze: | OpenAIRE |
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