Zaheer A, Zaheer S, Montgomery R. Proteolytic activity of largomycin.
BIOCHIMICA ET BIOPHYSICA ACTA 1985;
841:261-6. [PMID:
3896321 DOI:
10.1016/0304-4165(85)90067-4]
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Abstract
Largomycin, an antibiotic and antitumor protein, purified from the culture broth of Streptomyces pluricolorescens, displayed specific proteolytic activity. Pure largomycin did not degrade a number of substrates commonly used for detection of aminopeptidase, endopeptidase and carboxypeptidase activity. Pure largomycin degraded angiotensin II, bradykinin, a few dipeptides and a number of proteins of KB cell plasma membranes. The biological activity and the proteolytic activity of largomycin showed similar temperature-dependent patterns, suggesting that one protein is responsible for both activities. The apoprotein of largomycin, which did not show antibiotic activity, contained the proteolytic activity.
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