SNRPD1

This gene encodes a small nuclear ribonucleoprotein that belongs to the SNRNP core protein family. The protein may act as a charged protein scaffold to promote SNRNP assembly or strengthen SNRNP-SNRNP interactions through nonspecific electrostatic contacts with RNA. Two transcript variants encoding different isoforms have been found for this gene.

Full Name

Small Nuclear Ribonucleoprotein D1 Polypeptide

Function

Plays a role in pre-mRNA splicing as a core component of the spliceosomal U1, U2, U4 and U5 small nuclear ribonucleoproteins (snRNPs), the building blocks of the spliceosome (PubMed:11991638, PubMed:18984161, PubMed:19325628, PubMed:23333303, PubMed:25555158, PubMed:26912367, PubMed:28502770, PubMed:28781166, PubMed:28076346).
Component of both the pre-catalytic spliceosome B complex and activated spliceosome C complexes (PubMed:11991638, PubMed:26912367, PubMed:28502770, PubMed:28781166, PubMed:28076346).
Is also a component of the minor U12 spliceosome (PubMed:15146077).
May act as a charged protein scaffold to promote snRNP assembly or strengthen snRNP-snRNP interactions through non-specific electrostatic contacts with RNA (Probable)

Biological Process

Biological Process 7-methylguanosine cap hypermethylation1 PublicationIC:ComplexPortal
Biological Process mRNA splicing, via spliceosomeManual Assertion Based On ExperimentIDA:UniProtKB
Biological Process RNA splicingManual Assertion Based On ExperimentTAS:ProtInc
Biological Process spliceosomal complex assemblyManual Assertion Based On ExperimentTAS:ProtInc
Biological Process spliceosomal snRNP assemblyManual Assertion Based On ExperimentIDA:UniProtKB
Biological Process U2-type prespliceosome assembly1 PublicationIC:ComplexPortal

Cellular Location

Cytoplasm, cytosol
Nucleus
SMN-mediated assembly into core snRNPs occurs in the cytosol before SMN-mediated transport to the nucleus to be included in spliceosomes.

PTM

Methylated on arginine residues by PRMT5 and PRMT7; probable asymmetric dimethylation which is required for assembly and biogenesis of snRNPs.