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Extended X-ray absorption fine structure study of Rhodospirillum rubrum and Rhodospirillum molischianum cytochromes c': relationship between heme stereochemistry and spin state.

An EXAFS study on the oxidized and reduced forms of cytochromes c' from Rhodospirillum rubrum and Rhodospirillum molischianum was performed at pH 7. The cytochromes c' have an apparent coordination number of 5 in both oxidation states. Average Fe-ligand bond lengths of 2.02 +/- 0.025 and 2.06 +/- 0.025 A are obtained in their oxidized and reduced forms, respectively. By use of suitable values for the Fe-NHis bond length and Fe out-of-plane displacement, as determined by small molecule crystallographic techniques, the Fe-Npyrrole bond lengths and the porphyrin center-to-Npyrrole distance have been estimated for cytochrome c' in both of its oxidation states. With this model, estimates of the Fe-Npyrrole bond lengths are 2.01 +/- 0.03 and 2.05 +/- 0.03 A, for the oxidized and reduced cytochromes c', respectively. The center-to-Npyrrole distance is estimated to be 1.99 +/- 0.03 A for oxidized cytochrome c' and 2.03 +/- 0.03 A for reduced cytochrome c'.