This entry represents the N-terminal domain of archaeal Nop5, a Nop56/58 homologue which are pre-RNA processing ribonucleoproteins (RNP). This domain is very well conserved and mediates a stable interaction with fibrillarin, playing a role in both RNP assembly and methyltransferase activity [1].

1: Structurally conserved Nop56/58 N-terminal domain facilitates archaeal box C/D ribonucleoprotein-guided methyltransferase activity. Gagnon KT, Biswas S, Zhang X, Brown BA 2nd, Wollenzien P, Mattos C, Maxwell ES; J Biol Chem. 2012;287:19418-19428. PMID:22496443