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제 503 회 생명과학연구소 정기세미나 2016.04.07 |
Regulatory Networks in Response to Oxidative and Antibiotic Stresses in Actinomycetes
노정혜 교수 (서울대학교)
We have studied oxidative stress response in a model actinobacterium Streptomyces coelicolor, which undergoes differentiation and produces a variety of secondary metabolites including antibiotics. Sensor-regulators in this bacterium include a specific sigma-antisigma pair SigR-RsrA that responds to alkylation and/or oxidation by thiol-specific eletrophiles and oxidants, OxyR and CatR(PerR) responding to peroxides, OhrR responding to organic peroxides, and SoxR responding to diverse redox-active chemicals. Regulatory network of SigR-RsrA has been revealed through a genome-wide screening of more than 100 direct SigR-target genes (SigR regulon) in response to oxidants. Rapid production and degradation of an ustable isoform of SigR (SigR') amplifies and shuts off the transient response, respectively. In addition to this mode of oxidative induction, a separate pathway of inducing the synthesis of stable SigR for prolonged period was revealed to be triggered by sub-inhibitory concentrations of antibiotics, especially translational inhibitors. The role of SigR in antibiotic resistance and the mechanism of antibiotic induction will be discussed.
Education & Research Experiences
2000-현재 Professor, School of Biological Sciences, Seoul National University
1986-1999 Assistant, Associate, Full Professor, Dept. of Microbiology, College of Natural Sciences, Seoul National University
1984-1986 Research Associate, McArdle Laboratory for Cancer Research, UW-Madison, USA
1984년 Ph.D., University of Wisconsin, Madison, Molecular Biology
1979년 BS, Seoul National University, Dept. of Microbiology
Papers
Roe JH. (2015) Factors affecting redox potential and differential sensitivity of SoxR to redox-active compounds. Mol Microbiol. 97(5):808-21.등 42편