Methylosome protein 50
Definition:
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. 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.
References:
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[1]. Stephen Antonysamy, et al. Crystal structure of the human PRMT5:MEP50 complex. Proc Natl Acad Sci U S A. 2012 Oct 30;109(44):17960-5. [Content Brief]
[2]. Westley J Friesen, et al. A novel WD repeat protein component of the methylosome binds Sm proteins. J Biol Chem. 2002 Mar 8;277(10):8243-7. [Content Brief]
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