Abstract
A hypothetical model of the flavodoxin-tetraheme cytochrome c3 electron-transfer complex from the sulfate-reducing bacterium Desulfovibrio vulgaris has been constructed by using interactive computer graphics based on electrostatic potential field calculations and previous NMR experiments. Features of the proposed complex are (1) van der Waals contact between the flavin mononucleotide prosthetic group of flavodoxin and one heme of the cytochrome, (2) unique complementarity of electrostatic fields between the region surrounding this heme and the region surrounding the exposed portion of the flavin mononucleotide group of flavodoxin, and (3) no steric interferences between the two polypeptide chains in the complex. This complex is consistent with all structural and spectroscopic data available.
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