Abstract
The complete amino acid sequence of N. crassa cytochrome c is reported. The cytochromes c from "wild type" and a maternally inherited mutant mi-1 ("poky") are identical. The protein consists of a single polypeptide chain containing 107 residues. The molecule contains 2 histidine residues in positions 18 and 33 and lacks the histidine residue usually found at position 26. It is suggested that the 6th ligand of the heme Fe in cytochrome c may be either an oxygen (glutamyl or tyrosyl) or the indole of tryptophan.