Catalysis of the endonucleolytic cleavage of the mRNA in a double-stranded RNA molecule formed by the base pairing of an mRNA with an siRNA, yielding 5'-phosphomonoesters.
Synonyms:
related_synonym:
argonaute endoribonuclease activity
xref:
Reactome:R-HSA-9820842 "AGO2:endosiRNA hydrolyzes maternal mRNA in the zygote"