1ccj

CONFORMER SELECTION BY LIGAND BINDING OBSERVED WITH PROTEIN CRYSTALLOGRAPHY

spinqualitylabelsall models 1ccj, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ccj is a 1 chain structure with sequence from Atcc 18824. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: HEM Gene: CCP (ATCC 18824) Activity: Cytochrome-c peroxidase, with EC number 1.11.1.5 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CCPR_YEAST] Destroys radicals which are normally produced within the cells and which are toxic to biological systems. 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 A large-scale movement between "closed" and "open" conformations of a protein loop was observed directly with protein crystallography by trapping individual conformers through binding of an exogenous ligand and characterization with solution kinetics. The buried indole ring of Trp191 in cytochrome c peroxidase (CCP) was displaced by exogenous ligands, causing a conformational change of loop Pro190-Asn195 and exposing Trp191 to the protein surface. Kinetic measurements are consistent with a two-step binding mechanism in which the rate-limiting step is a transition of the protein to the open state, which then binds the ligand. This large-scale conformational change of a functionally important region of CCP is independent of ligand and indicates that about 4% of the wild-type protein is in the open form in solution at any given time. Protein conformer selection by ligand binding observed with crystallography.,Cao Y, Musah RA, Wilcox SK, Goodin DB, McRee DE Protein Sci. 1998 Jan;7(1):72-8. PMID:9514261 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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