The amino acid sequence of cytochrome c′ from the purple sulphur bacterium Chromatium vinosum

Abstract
An amino acid sequence is proposed for the cytochrome c'' from the photosynthetic purple sulphur bacterium C. vinosum strain D. It is a single polypeptide chain of 131 residues, with heme-attachment cysteine residues at positions 121 and 124. The results discredit an earlier report of a di-heme peptide sequence from this protein. The sequence belongs to the same class as the published Alcaligenes and Rhodospirillum rubrum cytochrome c'' sequences, but the resemblance is not close.