1mb0

CRYSTAL STRUCTURE OF THE RESPONSE REGULATOR DIVK AT PH 8.0 IN COMPLEX WITH MN2+

spinqualitylabelsall models 1mb0, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mb0 is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MN Related: 1m5t, 1mav, 1mb3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed DivK is an essential response regulator in the Gram-negative bacterium Caulobacter crescentus and functions in a complex phosphorelay system that precisely controls the sequence of developmental events during the cell division cycle. Structure determinations of this single domain response regulator at different pH values demonstrated that the five-stranded alpha/beta fold of the DivK protein is fully defined only at acidic pH. The crystal structures of the apoprotein and of metal-bound DivK complexes at higher pH values revealed a synergistic pH- and cation binding-induced flexibility of the beta4-alpha4 loop and of the alpha4 helix. This motion increases the solvent accessibility of the single cysteine residue in the protein. Solution state studies demonstrated a 200-fold pH-dependent increase in the affinity of manganese for the protein between pH 6.0 and 8.5 that seems to involve deprotonation of an acido-basic couple. Taken together, these results suggest that flexibility of critical regions of the protein, ionization of the cysteine 99 residue and improved K(D) values for the catalytic metal ion are coupled events. We propose that the molecular events observed in the isolated protein may be required for DivK activation and that they may be achieved in vivo through the specific protein-protein interactions between the response regulator and its cognate kinases. Crystallographic and biochemical studies of DivK reveal novel features of an essential response regulator in Caulobacter crescentus.,Guillet V, Ohta N, Cabantous S, Newton A, Samama JP J Biol Chem. 2002 Nov 1;277(44):42003-10. Epub 2002 Aug 10. PMID:12176983 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Response regulator

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