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The amino acid sequence of cytochrome c from Nigella damascena L. was determined on 0.2mumol of protein. Peptides from a single chymotryptic digest were analysed by the dansyl-Edman procedure. These peptides were ordered by reference to the sequences of other plant cytochromes c, assuming that the Nigella cytochrome is homologous with the other cytochromes. Many of the Nigella peptides were one or two residues short when compared with the corresponding chymotryptic peptides from other plant cytochromes c. These residues are assumed to have been removed by an endogenous carboxypeptidase, and the identification and placing of these residues is entirely based on homology. These residues are numbered 3, 18, 42, 43, 44, 54, 67, 72, 73, 82 and 105. A number of other positions are almost entirely placed by homology. These are positions which could not be placed definitely by dansyl-Edman analysis or by dansylation after digestion with carboxypeptidase A, and are numbered 14, 15, 16, 39, 40, 85, 86, 87 and 88. Except for residue 15, all residues based entirely, or nearly so, on homology have been previously found invariant in sequences of plant cytochromes c. Experimental details are given in a supplementary paper that has been deposited as Supplementary Publication SUP 50017, at the National Lending Library for Science and Technology, Boston Spa, Yorks. LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem. J. (1973) 131, 5.

The amino acid sequence of cytochrome c from Nigella damascena L. (love-in-a-mist)