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• W2065355068 abstract "The molecular structures of ferri- and ferrocytochrome c551 from Pseudomonas aeruginosa have been refined at a resolution of 1.6 Å, to an R factor of 19.5% for the oxidized molecule and 18.7% for the reduced. Reduction of oxidized crystals with ascorbate produced little change in cell dimensions, a 10% mean change in Fobs, and no damage to the crystals. The heme iron is not significantly displaced from the porphyrin plane. Bond lengths from axial ligands to the heme iron are as expected in a low-spin iron compound. A total of 67 solvent molecules were incorporated in the oxidized structure, and 73 in the reduced, of which four are found inside the protein molecule. The oxidized and reduced forms have virtually identical tertiary structures with 2 ° root-mean-square differences in main-chain torsion angles φ and ψ, but with larger differences along the two edges of the heme crevice. The difference map and pyrrole ring tilt suggest that a partially buried water molecule (no. 23) in the heme crevice moves upon change of oxidation state. Pseudomonas cytochrome c551 differs from tuna cytochrome c in having: (1) a water molecule (no. 23) at the upper left of the heme crevice; that is, between Pro62 and the heme pyrrol 3 ring on the sixth ligand Met61 side, where tuna cytochrome c has an evolutionary invariant Phe82 ring; (2) a string of hydrophobic side-chains along the left side of the heme crevice, and fewer positively charged lysines in the vicinity; and (3) a more exposed and presumably more easily ionizable heme propionate group at the bottom of the molecule. A network of hydrogen bonds in the heme crevice is reminiscent of that inside the heme crevice of tuna cytochrome c. As in tuna, a slight motion of the water molecule toward the heme is observed in the oxidized state, helping to give the heme a more polar microenvironment. The continuity of solvent environment between the heme crevice and the outer medium could explain the greater dependence of redox potential on pH in cytochrome c551 than in cytochrome c." @default.
• W2065355068 created "2016-06-24" @default.
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• W2065355068 date "1982-04-01" @default.
• W2065355068 modified "2023-10-14" @default.
• W2065355068 title "Structure of cytochrome c551 from Pseudomonas aeruginosa refined at 1.6 Å resolution and comparison of the two redox forms" @default.
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• W2065355068 doi "https://doi.org/10.1016/0022-2836(82)90335-7" @default.
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