1bfx

THE SOLUTION NMR STRUCTURE OF THE B FORM OF OXIDIZED RAT MICROSOMAL CYTOCHROME B5, MINIMIZED AVERAGE STRUCTURE

spinqualitylabelsall models 1bfx, 1 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1bfx is a 1 chain structure with sequence from Rattus norvegicus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: HEM 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 Cytochrome b5 in solution has two isomers (A and B) differing by a 180 degrees rotation of the protoporphyrin IX plane around the axis defined by the alpha and gamma meso protons. Homonuclear and heteronuclear NMR spectroscopy has been employed in order to solve the solution structure of the minor (B) form of the oxidized state of the protein and to probe its backbone dynamics in the microsecond--ms timescale in both oxidation states. A family of 40 conformers has been obtained using 1302 meaningful NOEs and 220 pseudocontact shifts and is characterized by high quality and good resolution (rmsd to the mean structure of 0.055 +/- 0.009 nm and 0.103 +/- 0.011 nm for backbone and heavy atoms, respectively). Extensive comparisons of the structural and dynamics changes associated with the A-to-B form interconversion for both oxidation states were subsequently performed. Propionate 6 experiences a redox-state-dependent reorientation as does propionate 7 in the A form. Significant insights are obtained into the role of the protein frame for efficient biological function and backbone mobility is proposed to be one of the factors that could control the reduction potential of the heme. Solution structure of the B form of oxidized rat microsomal cytochrome b5 and backbone dynamics via 15N rotating-frame NMR-relaxation measurements. Biological implications.,Arnesano F, Banci L, Bertini I, Felli IC, Koulougliotis D Eur J Biochem. 1999 Mar;260(2):347-54. PMID:10095768 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome b5

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