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Research Support, Non-U.S. Gov't
- Ligand-Receptor Recognition for Activation of Quorum Sensing in Staphylococcus aureus
- Li-Chun Chen , Li-Tse Tsou , Feng-Jui Chen
- J. Microbiol. 2009;47(5):572-581. Published online October 24, 2009
- DOI: https://doi.org/10.1007/s12275-009-0004-2
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- 12 Crossref
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Abstract
- The accessory gene regulator (agr) locus controls many of the virulence toxins involved in Staphylococcus aureus pathogenesis, and can be divided into four specificity groups. AgrC is the only group-specific receptor to mediate both intra-group activation and inter-group inhibition. We studied the ligand-receptor recognition of the agr system in depth by using a luciferase reporter system to identify the key residues responsible for AgrC activation in two closely related agr groups, AgrC-I, and AgrC-IV. Fusion PCR and site-directed mutagenesis were used to screen for functional residues of AgrC. Our data suggest that for AgrC-IV activation, residue 101 is critical for activating the receptor. In contrast, the key residues for the activation of AgrC-I are located at residues 49~59, 107, and 116. However, three residue changes, T101A, V107S, I116S, are sufficient to convert the AIP recognizing specificity from AgrC-IV to AgrC-I.
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Citations
Citations to this article as recorded by
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Virulence attributes of successful methicillin-resistant
Staphylococcus aureus
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