Inhibits the elongation phase of protein synthesis. It inactivates fungal ribosomes even more effectively than mammalian ribosomes and is thought to function as a constitutive antifungal agent in plants. Endohydrolysis of the N-glycosidic bond at one specific adenosine on the 28S rRNA. Starchy endosperm of mature seeds. Three similar RIP 30 isoforms I, II, and III have been described in Barley. Belongs to the ribosome-inactivating protein family. Type 1 RIP subfamily.