An octapeptide was isolated from a fungus for use as a new
antibiotic. The composition of the peptide was 2 Gly, Lys, Met,
Pro, Arg, Trp, Tyr. Edman degradation of the intact peptide yields
FDNB- glycine. The peptide was then treated with
carboxypeptidase A, B and C, only carboxypeptidase C had
any effect cleaving off Pro. The peptide was then treated
with trypsin (cleaves at Arg and Lys), which gave
two tripeptides and a dipeptide. The compositions of
the tripeptides...