Abstract
A comparative study of some of the chemical properties of three strains of the Southern bean mosaic virus (SBMV) was made using purified whole virus or the isolated protein or RNA components. All three strains showed the same content and hypochromicity of the RNA. The cowpea strain contained slightly less adenylic acid and more cytidylic acid than the type or Mexican strains, which were very similar in base composition. The protein of the three strains differed in amino acid composition, especially in the content of serine, proline, alanine, isoleucine, leucine, and lysine. Amino acid analyses and tryptic peptide maps confirmed the results of Tremaine (1966); they indicated a protein subunit with a molecular weight of 29,000, a value that corresponds to twice the minimal chemical molecular weight. Hydrazinolysis of the protein from each strain indicated that all three possess serine as the C-terminal amino acid.
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