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A bacterial two-component signal transduction system, WalK/WalR, is essential to the cell viability of Gram-positive bacteria and is therefore a potential target for the development of a new class of antibiotics. We have solved the X-ray crystal structure of the DNA-binding domain of the response regulator WalR (WalRc) from a Gram-positive pathogen Staphylococcus aureus, currently causing serious problems in public health through the acquisition of multi-drug resistance. The structure contains a winged helix-turn-helix motif and closely resembles those of WalRs of Bacillus subtilis and Enterococcus faecalis, and also that of PhoB of Escherichia coli. Gel mobility shift assays with mutant WalRs revealed specific interactions of WalR with the target DNA, as elaborated by in silico modeling of the WalRc-DNA complex.

bioscience, biotechnology, and biochemistry

X-Ray Crystal Structure of the DNA-Binding Domain of Response Regulator WalR Essential to the Cell Viability of <i>Staphylococcus aureus</i> and Interaction with Target DNA

X-Ray Crystal Structure of the DNA-Binding Domain of Response Regulator WalR Essential to the Cell Viability of Staphylococcus aureus and Interaction with Target DNA