RRNK N-glikozilaza (EC 3.2.2.22, ribozomalna ribonukleatna N-glikozidaza, nigrin b, RNK N-glikozidaza, rRNK N-glikozidaza, ricin, momorkohin-S, Mirabilis antiviralni protein, momorkohin-S, gelonin, saporin) je enzim sa sistematskim imenom rRNK N-glikohidrolaza.^[1] Ovaj enzim katalizuje sledeću hemijsku reakciju

hidroliza N-glikozilne veze na A-4324 u 28S rRNK iz ribozoma pacova

Ricinski A-lanac i srodni toksini imaju ovu aktivnost.

↑ Endo, Y. and Tsurugi, K. (1988). „The RNA N-glycosidase activity of ricin A-chain. The characteristics of the enzymatic activity of ricin A-chain with ribosomes and with rRNA”. J. Biol. Chem. 263: 8735-8739. PMID 3288622.

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MeSH RRNA+N-glycosylase