1crc

CYTOCHROME C AT LOW IONIC STRENGTH

spinqualitylabelsall models 1crc, resolution 2.08Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1crc is a 2 chain structure with sequence from Equus caballus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: HEM NonStd Res: ACE Resources: FirstGlance, OCA, RCSB, PDBsum 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 BACKGROUND: Cytochrome c is an integral part of the mitochondrial respiratory chain. It is confined to the intermembrane space of mitochondria, and has the function of transferring electrons between its redox partners. Solution studies of cytochrome c indicate that the conformation of the molecule is sensitive to the ionic strength of the medium. RESULTS: The crystal structures of cytochromes c from several species have been solved at extremely high ionic strengths of near-saturated solutions of ammonium sulfate. Here we present the first crystal structure of ferricytochrome c at low ionic strength refined at 2.1 A resolution. In general, the structure has the same features as those determined earlier. However, there are some differences in both backbone and side-chain conformations in several areas. These areas coincide with those observed by NMR and resonance Raman spectroscopy to be sensitive to ionic strength. CONCLUSIONS: Neither ionic strength nor crystal-packing interactions have much influence on the conformation of horse cytochrome c. Nevertheless, some differences in the side-chain conformations at high and low ionic strengths may be important for understanding how the protein functions. Close examination of the gamma-turn (residues 27-29) conserved in cytochromes c leads us to propose the 'negative classical' gamma-turn to describe this unusual feature. The low ionic strength crystal structure of horse cytochrome c at 2.1 A resolution and comparison with its high ionic strength counterpart.,Sanishvili R, Volz KW, Westbrook EM, Margoliash E Structure. 1995 Jul 15;3(7):707-16. PMID:8591047 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome c

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