Methylosome protein 50 - Q9BQA1 (MEP50_HUMAN)


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Non-catalytic component of the methylosome complex, composed of PRMT5, WDR77 and CLNS1A, which modifies specific arginines to dimethylarginines in several spliceosomal Sm proteins and histones (PubMed:11756452). This modification targets Sm proteins to the survival of motor neurons (SMN) complex for assembly into small nuclear ribonucleoprotein core particles. Might play a role in transcription regulation. The methylosome complex also methylates the Piwi proteins (PIWIL1, PIWIL2 and PIWIL4), methylation of Piwi proteins being required for the interaction with Tudor domain-containing proteins and subsequent localization to the meiotic nuage (PubMed:23071334). UniProt
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Subunit Structure
Component of the methylosome complex composed of PRMT5, WDR77 and CLNS1A (PubMed:21081503, PubMed:18984161). Found in a complex composed of PRMT5, WDR77 and RIOK1 (PubMed:21081503). RIOK1 and CLNS1A bound directly to PRMT5 at the same binding site, in a mutually exclusive manner, which allows the recruitment of distinct methylation substrates, such as nucleolin/NCL and Sm proteins, respectively (PubMed:21081503). Found in a complex with the component of the methylosome, PRMT5, CLNS1A, WDR77, PRMT1 and ERH (PubMed:25284789). Directly interacts with PRMT5, as well as with several Sm proteins, including SNRPB and SNRPD2 and, more weakly, SNRPD3 and SNRPE (PubMed:11756452). Forms a compact hetero-octamer with PRMT5, decorating the outer surface of a PRMT5 tetramer. Interacts with SUZ12 and histone H2A/H2AC20, but not with histones H2B, H3 nor H4 (PubMed:16712789). Interacts with CTDP1 and LSM11 (PubMed:12560496, PubMed:16087681). Interacts with APEX1, AR and NKX3-1 (PubMed:19188445, PubMed:12972618). Interacts with CHTOP (PubMed:25284789). UniProt
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