dactinomycin

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A chromopeptide antineoplastic antibiotic isolated from the bacterium Streptomyces parvulus. Dactinomycin intercalates between adjacent guanine-cytosine base pairs, blocking the transcription of DNA by RNA polymerase; it also causes single-strand DNA breaks, possibly via a free-radical intermediate or an interaction with topoisomerase II.

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Synonym:	actinomycin A IV actinomycin C1 actinomycin D actinomycin I1 actinomycin IV actinomycin X 1 actinomycin-[thr-val-pro-sar-meval] dactinomycine meractinomycin
US brand name:	Cosmegen
Foreign brand name:	Lyovac Cosmegen
Abbreviation:	DACT
Chemical structure:	2-bis[cyclo(N-methyl-L-valyl-sarcosyl-L-prolyl-D-valyl-L-threonyl)]-1,9 dimethyl-4,6 3H-phenoxazinone-3

dactinomycin

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