Abstract
Genome mining of an indolocarbazole-type gene cluster from a marine-derived Nocardiopsis flavescens NA01583 strain led to the discovery of three new indolocarbazole alkaloids (1-3). Heterologous expression of the intact loo gene cluster in a surrogate host Streptomyces lividans K4-114 led to the successful production of 3. Notably, compound 1 showed potent cytotoxic activities toward eight cancer cell lines with IC50 values ranging from 41 to 283 nM.
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