6is4

Crystal Structure of Staphylococcus aureus response regulator ArlR DNA binding domain

spinqualitylabelsall models 6is4, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6is4 is a 1 chain structure with sequence from Staphylococcus aureus RF122. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.854Å Ligands: MG, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ARLR_STAAB Member of the two-component regulatory system ArlS/ArlR involved in the regulation of adhesion, autolysis, multidrug resistance and virulence. Publication Abstract from PubMed Staphylococcus aureus ArlRS is a key two-component regulatory system necessary for adhesion, biofilm formation, and virulence. The response regulator ArlR consists of a C-terminal DNA-binding effector domain and an N-terminal receiver domain that is phosphorylated by ArlS, the cognate transmembrane sensor histidine kinase. We demonstrate that the receiver domain of ArlR adopts the canonical alpha5beta5 response regulator assembly, which dimerizes upon activation, using beryllium trifluoride as an aspartate phosphorylation mimic. Activated ArlR recognizes a 20-bp imperfect inverted repeat sequence in the ica operon, which is involved in intercellular adhesion polysaccharide production. Crystal structures of the inactive and activated forms reveal that activation induces a significant conformational change in the beta4-alpha4 and beta5-alpha5-connecting loops, in which the alpha4 and alpha5 helices constitute the homodimerization interface. Crystal structures of the DNA-binding ArlR effector domain indicate that it is able to dimerize via a non-canonical beta1-beta2 hairpin domain swapping, raising the possibility of a new mechanism for signal transduction from the receiver domain to effector domain. Taken together, the current study provides structural insights into the activation of ArlR and its recognition, adding to the diversity of response regulation mechanisms that may inspire novel antimicrobial strategies specifically targeting Staphylococcus. Deciphering the activation and recognition mechanisms of Staphylococcus aureus response regulator ArlR.,Ouyang Z, Zheng F, Chew JY, Pei Y, Zhou J, Wen K, Han M, Lemieux MJ, Hwang PM, Wen Y Nucleic Acids Res. 2019 Dec 2;47(21):11418-11429. doi: 10.1093/nar/gkz891. PMID:31598698 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Response regulator 3D structure

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