NCIt definition : A natural analogue of actinomycin, a chromopeptide antineoplastic antibiotic isolated
from the bacterial genus Streptomyces. Actinomycin C2 inhibits DNA replication as
well as RNA and protein synthesis by various mechanisms including, intercalating into
the minor groove of DNA and interfering with the function of topoisomerase II. In
addition, actinomycin C2 appears to block the interaction between the SH2 domain of
growth factor receptor-bound protein-2 (GRB2) and the Src homology 2 domain containing
transforming protein 1 adaptor protein SHC, which plays a key role in the Ras signaling
pathway thereby halting cellular differentiation and proliferation.;