Abstract
Periplasmic extract from Desulfovibrio desulfuricans (NCIMB 8372) was found to contain two different c-type cytochromes. One is tetraheme cytochrome c3 and the other is monoheme cytochrome c553. Cytochrome c3 could be purified by a procedure involving only one chromatographic step, whereas cytochrome c553 required several such steps. Cytochrome c3 was found to have a relative molecular mass of 14300 and an isoionic point higher than 9. Analysis of the redox potentials indicated one heme at -260 mV and three hemes around -330 mV. Cytochrome c553 had a relative molecular mass of 7200, an isoionic point higher than 9 and a redox potential of 0 mV.
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