Abstract
The amino acid sequence of the coat protein of the cowpea strain of tobacco mosaic virus (cowpea virus) has been determined. The tryptic peptide overlaps were obtained by digesting the protein with chymotrypsin and separating and analysing the lysine- and arginine-containing chymotryptic peptides. The primary structure of cowpea virus protein has been found to differ markedly from that of any other known strain of tobacco mosaic virus, and contains 3 amino acid residues more and 96 amino acid changes from the type strain. The significance of the distribution of those areas of the protein in which the amino acid residues are the same for all naturally occurring strains and chemically induced mutants of tobacco mosaic virus so far studied and the residues that form the important carboxyl · carboxylate pairs are discussed.
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