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- W1534136908 abstract "Computer graphics-generated models for the electron transfer complexes formed between cytochrome b5 and the subunits of methemoglobin are proposed. For both complexes, the orientation allowing optimal hydrogen bonding involves interaction between negatively charged residues on cytochrome b5 and positively charged residues on methemoglobin. In each complex, the heme groups of the interacting species are coplanar with the edges of the heme groups separated by 7-8 A and with the iron atoms 16 A apart. For the alpha-chain X cytochrome b5 complex, alpha-chain residues 56 (Lys), 60 (Lys), and 90 (Lys) interact with cytochrome b5 residues 44 (Glu), 43 (Glu), and 60 (Asp) respectively. A fourth hydrogen bond involves alpha-61 (Lys) bridging between a heme propionate from cytochrome b5 and a heme propionate from the alpha-chain. The contacts present in the beta-chain X cytochrome b5 complex involve hydrogen-bonding between beta-chain lysyl residues 59, 61, 65, and 95, and cytochrome b5 residues 48 (Glu), 44 (Glu), 43 (Glu), and 60 (Asp) respectively. An additional hydrogen bond can be formed by bridging of the epsilon-amino group of beta-66 (Lys) between a heme propionate from cytochrome b5 and a beta-chain heme propionate. In each complex, two nonionic interactions, one on each side of the heme groups, are also suggested. These interactions appear to effectively exclude external water molecules from the center of the protein-protein interaction domain. Comparison of the proposed binding loci for cytochrome b5 on the methemoglobin subunits with those proposed on cytochrome c reveals considerable structural homology between the cytochrome b5 binding sites." @default.
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- W1534136908 date "1983-06-01" @default.
- W1534136908 modified "2023-09-30" @default.
- W1534136908 title "Models for the complexes formed between cytochrome b5 and the subunits of methemoglobin." @default.
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- W1534136908 doi "https://doi.org/10.1016/s0021-9258(18)32188-4" @default.
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