3cyt

REDOX CONFORMATION CHANGES IN REFINED TUNA CYTOCHROME C

spinqualitylabelsall models 3cyt, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3cyt is a 2 chain structure with sequence from Thunnus alalunga. The December 2002 RCSB PDB Molecule of the Month feature on Cytochrome c by David S. Goodsell is 10.2210/rcsb_pdb/mom_2002_12. The May 2007 RCSB PDB Molecule of the Month feature on Aconitase and Iron Regulatory Protein 1 by David S. Goodsell is 10.2210/rcsb_pdb/mom_2007_5. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: ACE, HEC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CYC_THUAA Electron carrier protein. The oxidized form of the cytochrome c heme group can accept an electron from the heme group of the cytochrome c1 subunit of cytochrome reductase. Cytochrome c then transfers this electron to the cytochrome oxidase complex, the final protein carrier in the mitochondrial electron-transport chain. 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 Tuna ferrocytochrome c and ferricytochrome c have been refined independently at high resolution (1.5 A and 1.8 A) to crystallographic residual errors of 17.3% and 20.8%, respectively. Small but significant conformational differences are seen surrounding a buried water molecule that is hydrogen bonded to Asn-52, Tyr-67, and Thr-78. In the oxidized state, this water molecule is 1.0 A closer to the heme and the heme has moved 0.15 A out of its heme crevice; both changes lead to a more polar microenvironment for the heme. Chemical modification studies, patterns of evolutionary conservatism, structural differences in bacterial cytochromes, and x-ray studies all agree that the "active site" for cytochrome c is bounded by lysines 8, 13,27, 72, 79, 86, and 87 (thus containing the evolutionary conservative 72-87 loop) and has the buried water molecule just below its surface and the opening of the heme crevice slightly to one side. Redox conformation changes in refined tuna cytochrome c.,Takano T, Dickerson RE Proc Natl Acad Sci U S A. 1980 Nov;77(11):6371-5. PMID:6256733 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome C 3D structures

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