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https://hdl.handle.net/2440/3016
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Type: | Journal article |
Title: | RegR, a global LacI/GalR family regulator, modulates virulence and competence in Streptococcus pneumoniae |
Author: | Chapuy-Regaud, S. Ogunniyi, A. Diallo, N. Huet, Y. Desnottes, J. Paton, J. Escaich, S. Trombe, M. |
Citation: | Infection and Immunity, 2003; 71(5):2615-2625 |
Publisher: | Amer Soc Microbiology |
Issue Date: | 2003 |
ISSN: | 0019-9567 1098-5522 |
Statement of Responsibility: | Sabine Chapuy-Regaud, David Ogunniyi, Nicole Diallo,Yvette Huet, Jean-François Desnottes, James C. Paton, Sonia Escaich, and Marie-Claude Trombe |
Abstract: | The homolactic and catalase-deficient pathogen Streptococcus pneumoniae is not only tolerant to oxygen but requires the activity of its NADH oxidase, Nox, to develop optimal virulence and competence for genetic transformation. In this work, we show that the global regulator RegR is also involved in these traits. Genetic dissection revealed that RegR regulates competence and the expression of virulence factors, including hyaluronidase. In bacteria grown in vitro, RegR represses hyaluronidase. At neutral pH, it increases adherence to A549 epithelial cells, and at alkaline pH, it acts upstream of the CiaRH two-component signaling system to activate competence. These phenotypes are not associated with changes in antibiotic resistance, central metabolism, and carbohydrate utilization. Although the RegR0 (where 0 indicates the loss of the protein) mutation is sufficient to attenuate experimental virulence of strain 23477 in mice, the introduction of an additional hyl0 (where 0 indicates the loss of function) mutation in the RegR0 strain 23302 dramatically reduces its virulence. This indicates that residual virulence of the RegR0 Hyl+ derivative is due to hyaluronidase and supports the dual role of RegR in virulence. This LacI/GalR regulator, not essential for in vitro growth in rich media, is indeed involved in the adaptive response of the pneumococcus via its control of competence, adherence, and virulence |
Keywords: | Animals Mice, Inbred BALB C Humans Mice Streptococcus pneumoniae Lactams Hyaluronoglucosaminidase Bacterial Proteins Transcription Factors Anti-Bacterial Agents Bacterial Adhesion Virulence Amino Acid Sequence Genome, Bacterial Hydrogen-Ion Concentration Molecular Sequence Data Male Carbohydrate Metabolism |
Description: | Copyright © 2003 by the American Society for Microbiology. |
DOI: | 10.1128/IAI.71.5.2615-2625.2003 |
Published version: | http://iai.asm.org/cgi/content/abstract/71/5/2615 |
Appears in Collections: | Aurora harvest 6 Molecular and Biomedical Science publications |
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