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EMBO J 2002 Nov 01;2121:5853-63. doi: 10.1093/emboj/cdf585.
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Assisted RNP assembly: SMN and PRMT5 complexes cooperate in the formation of spliceosomal UsnRNPs.

Meister G , Fischer U .

Although spliceosomal Sm proteins can assemble spontaneously onto UsnRNA in vitro, this process requires assisting factors in vivo. SMN, the protein involved in spinal muscular atrophy, is part of a complex that contains the Sm proteins and serves as a critical factor for this reaction. Here, we have reconstituted the SMN-dependent assembly of UsnRNPs in vitro. We demonstrate that the SMN complex is necessary and sufficient for the assembly reaction. The PRMT5 complex, previously implicated in methylation and storage of Sm proteins, interacts with the SMN complex and enhances its activity in an ATP-dependent manner. These data uncover the SMN-PRMT5 complex as a functional entity that promotes the assisted assembly of spliceosomal UsnRNPs, and potentially other, RNA-protein complexes.

PubMed ID: 12411503
PMC ID: PMC131082
Article link: EMBO J

Species referenced: Xenopus laevis
Genes referenced: prmt5 smn1

References [+] :
Brahms, Symmetrical dimethylation of arginine residues in spliceosomal Sm protein B/B' and the Sm-like protein LSm4, and their interaction with the SMN protein. 2001, Pubmed