5o8y

Conformational dynamism for DNA interaction in Salmonella typhimurium RcsB response regulator.

spinqualitylabelsall models 5o8y, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5o8y is a 6 chain structure with sequence from Salmonella enterica subsp. enterica serovar Typhimurium str. LT2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.3Å Ligands: PE4, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RCSB_SALTY Component of the Rcs signaling system, which controls transcription of numerous genes. RcsB is the response regulator that binds to regulatory DNA regions. Can function both in an RcsA-dependent or RcsA-independent manner.[HAMAP-Rule:MF_00981] Publication Abstract from PubMed The RcsCDB phosphorelay system controls an extremely large regulon in Enterobacteriaceae that involves processes such as biofilm formation, flagella production, synthesis of extracellular capsules and cell division. Therefore, fine-tuning of this system is essential for virulence in pathogenic microorganisms of this group. The final master effector of the RcsCDB system is the response regulator (RR) RcsB, which activates or represses multiple genes by binding to different promoter regions. This regulatory activity of RcsB can be done alone or in combination with additional transcriptional factors in phosphorylated or dephosphorylated states. The capacity of RcsB to interact with multiple promoters and partners, either dephosphorylated or phosphorylated, suggests an extremely conformational dynamism for this RR. To shed light on the activation mechanism of RcsB and its implication on promoter recognition, we solved the crystal structure of full-length RcsB from Salmonella enterica serovar Typhimurium in the presence and absence of a phosphomimetic molecule BeF3-. These two novel structures have guided an extensive site-directed mutagenesis study at the structural and functional level that confirms RcsB conformational plasticity and dynamism. Our data allowed us to propose a beta5-T switch mechanism where phosphorylation is coupled to alternative DNA binding ways and which highlights the conformational dynamism of RcsB to be so pleiotropic. Conformational dynamism for DNA interaction in the Salmonella RcsB response regulator.,Casino P, Miguel-Romero L, Huesa J, Garcia P, Garcia-Del Portillo F, Marina A Nucleic Acids Res. 2017 Nov 23. pii: 4653532. doi: 10.1093/nar/gkx1164. PMID:29186528 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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