RISC is a 5' phosphomonoester-producing RNA endonuclease.

Abstract excerpt

Gene silencing in the process of RNA interference is mediated by a ribonucleoprotein complex referred to as RNA-induced silencing complex (RISC). Here we describe the molecular mechanism of target RNA cleavage using affinity-purified minimal RISC from human cells. Cleavage proceeds via hydrolysis and the release of a 3'-hydroxyl and a 5'-phosphate terminus. Substitution of the 2'-hydroxyl group at the cleavage...

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