5b70

OxyR2 E204G regulatory domain from Vibrio vulnificus

spinqualitylabelsall models 5b70, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5b70 is a 4 chain structure with sequence from Vibrio vulnificus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A087I947_VIBVL Publication Abstract from PubMed Most Gram-negative bacteria respond to excessive levels of H2O2 using the peroxide-sensing transcriptional regulator OxyR, which can induce the expression of antioxidant genes to restore normality. Vibrio vulnificus has two distinct OxyRs (OxyR1 and OxyR2), which are sensitive to different levels of H2O2 and induce expression of two different peroxidases, Prx1 and Prx2. While OxyR1 has both high sequence similarity and comparable H2O2 sensitivity to other OxyR proteins, OxyR2 exhibits limited sequence similarity and is more sensitive to H2O2 To investigate the basis for this difference, we determined crystal structures and carried out biochemical analyses of OxyR2. The determined structure of OxyR2 revealed a flipped conformation of the peptide bond before Glu204, a position occupied by glycine in other OxyR proteins. Activity assays showed that the sensitivity to H2O2 was reduced to the level of other OxyR proteins by the E204G mutation. We solved the structure of the OxyR2-E204G mutant with the same packing environment. The structure of the mutant revealed a dual conformation of the peptide bond before Gly204, indicating the structural flexibility of the region. This structural duality extended to the backbone atoms of Gly204 and the imidazole ring of His205, which interact with H2O2 and invariant water molecules near the peroxidatic cysteine, respectively. Structural comparison suggests that Glu204 in OxyR2 provides rigidity to the region that is important in H2O2 sensing, compared to the E204G structure or other OxyR proteins. Our findings provide a structural basis for the higher sensitivity of OxyR2 to H2O2 and also suggest a molecular mechanism for bacterial regulation of expression of antioxidant genes at divergent concentrations of cellular H2O2. The hydrogen peroxide hypersensitivity of OxyR2 in Vibrio vulnificus depends on conformational constraints.,Jo I, Kim D, Bang YJ, Ahn J, Choi SH, Ha NC J Biol Chem. 2017 Mar 6. pii: jbc.M116.743765. doi: 10.1074/jbc.M116.743765. PMID:28264933 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Transcriptional activator 3D structures

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