Journal
JOURNAL OF ANTIBIOTICS
Volume 63, Issue 3, Pages 127-134Publisher
JAPAN ANTIBIOTICS RESEARCH ASSOC
DOI: 10.1038/ja.2010.4
Keywords
antibacterial agent; inhibitor; two-component signal transduction system; response regulator; WaIR (YycF)
Funding
- Japan Society for the Promotion of Science (JSPS) [20248012]
- Bio-Oriented Technology Research Advancement Institution (BRAIN) [2006-2010]
- European Commission [LSHG-CT-2004-503468, LHSM-CT-2006-019064, LSHG-CT-2006-037469]
- Centre National de la Recherche Scientifique (CNRS) [URA 2172]
- Institut Pasteur
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The WalK/WaIR (YycG/YycF) two-component system, which is essential for cell viability, is highly conserved and specific to low-GC percentage of Gram-positive bacteria, making it an attractive target for novel antimicrobial compounds. Recent work has shown that WalK/WaIR exerts an effect as a master regulatory system in controlling and coordinating cell wall metabolism with cell division in Bacillus subtilis and Staphylococcus aureus. In this paper, we develop a high-throughput screening system for WaIR inhibitors and identify two novel inhibitors targeting the WaIR response regulator (RR): walrycin A (4-methoxy-1-naphthol) and walrycin B (1,6-dimethy1-3[4-(trifluoromethyl)phenyl]pyrimido[5,4-e][ 1,2,4]triazine-5,7-dione). Addition of these compounds simultaneously affects the expression of WaIR regulon genes, leading to phenotypes consistent with those of cells starved for the WalK/WaIR system and having a bactericidal effect. B. subtilis cells form extremely long aseptate filaments and S. aureus cells form large aggregates under these conditions. These results show that walrycins A and B are the first antibacterial agents targeting WaIR in B. subtilis and S. aureus. The Journal of Antibiotics (2010) 63, 127-134; doi:10.1038/ja.2010.4; published online 29 January 2010
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