RNA recognition motif (RRM) found in nucleoporin Nup53
This subgroup corresponds to the RRM of nucleoporin Nup53, also termed mitotic phosphoprotein 44 (MP-44), or nuclear pore complex protein Nup53, required for normal cell growth and nuclear morphology in vertebrate. It tightly associates with the nuclear envelope membrane and the nuclear lamina where it interacts with lamin B. It may also interact with a group of nucleoporins including Nup93, Nup155, and Nup205 and play a role in the association of the mitotic checkpoint protein Mad1 with the nuclear pore complex (NPC). Nup35 contains an atypical RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain), a C-terminal amphipathic alpha-helix and several FG repeats. This RRM lacks the conserved residues that typically bind RNA in canonical RRM domains.