Inhibits viral infection of plants, and protein synthesis in vitro. Has also been shown to inhibit the replication of mammalian viruses. The protein may provide a means of cellular suicide upon invasion by a virus. Endohydrolysis of the N-glycosidic bond at one specific adenosine on the 28S rRNA. Monomer. Belongs to the ribosome-inactivating protein family. Type 1 RIP subfamily.