A key step in ribosome biogenesis is the nuclear export of pre-ribosomal particles. Nmd3, a highly conserved protein in eukaryotes, is a specific adaptor required for the export of pre-60S particles. This entry represents the second domain in NMD3 which adopts an SH3-fold denoted as RBDII in [1]. The two short alpha-helices in RBDII participate in rRNA recognition [1].

1: Structural snapshot of cytoplasmic pre-60S ribosomal particles bound by Nmd3, Lsg1, Tif6 and Reh1. Ma C, Wu S, Li N, Chen Y, Yan K, Li Z, Zheng L, Lei J, Woolford JL Jr, Gao N; Nat Struct Mol Biol. 2017;24:214-220. PMID:28112732