Abstract
The proteins of turnip rosette virus (TRosV) a sobemovirus, and the Prunus strain of tomato bushy stunt virus (TBSV-P) were cleaved with cyanogen bromide, and highly basic peptides were isolated by ion-exchange chromatography. The amino acid composition and sodium dodecyl sulphate – polyacrylamide gel electrophoresis indicated the basic peptide from TRosV had 40 amino acid residues, including 11 basic residues. This peptide had a composition similar to basic peptides isolated from the sobemoviruses, sowbane mosaic virus, and two strains of southern bean mosaic virus. The amino acid composition and size of the basic peptide from TBSV-P were similar to those found for the amino terminal sequence of the type strain of TBSV.
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