Sinefungin, a polar nucleoside antifungal active with broad biological activity, was isolated from a number of species of Streptomyces in the early 1970s. Sinefungin can be used as a bioprobe to block methyltransferase-dependent pathways.
Sinefungin is a natural nucleoside analog of S-adenosylmethionine and inhibits Streptococcus pneumoniae biofilm growth. Its derivatives can be used as inhibitors and structure probes for human protein lysine methyltransferase SETD2.