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Bio/technology (Nature Publishing Company)

Potent and specific inhibitors of protein kinase C of microbial origin.


PMID 1370017

Abstract

Potent and specific inhibitors of protein kinase C have been found in streptomyces and fungi: Staurosporine, an alkaloid from Streptomyces sp., is the most potent inhibitor of protein kinases with an IC50 in the nanomolar range. UCN-01 (7-hydroxy staurosporine), isolated from Streptomyces sp., is a selective inhibitor of protein kinase C with antitumor activity. Calphostin, isolated from the fungus Cladosporium cladosporioides, specifically inhibits protein kinase C (IC50 = 0.05 microM) without inhibiting other protein kinases. Microbial metabolites appear to be a promising source of inhibitors that target signal transduction pathways of eukaryotes.

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C6303
Calphostin C from Cladosporium cladosporioides, ≥90% (HPLC), powder
C44H38O14