| Function | The SMN complex catalyzes the assembly of small nuclear ribonucleoproteins (snRNPs), the building blocks of the spliceosome, and thereby plays an important role in the splicing of cellular pre-mRNAs. Most spliceosomal snRNPs contain a common set of Sm proteins SNRPB, SNRPD1, SNRPD2, SNRPD3, SNRPE, SNRPF and SNRPG that assemble in a heptameric protein ring on the Sm site of the small nuclear RNA to form the core snRNP (Sm core). In the cytosol, the Sm proteins SNRPD1, SNRPD2, SNRPE, SNRPF and SNRPG are trapped in an inactive 6S pICln-Sm complex by the chaperone CLNS1A that controls the assembly of the core snRNP. To assemble core snRNPs, the SMN complex accepts the trapped 5Sm proteins from CLNS1A forming an intermediate. Binding of snRNA inside 5Sm triggers eviction of the SMN complex, thereby allowing binding of SNRPD3 and SNRPB to complete assembly of the core snRNP. May also play a role in the metabolism of small nucleolar ribonucleoprotein (snoRNPs). |
| Protein Name | Probable Atp-Dependent Rna Helicase Ddx20Component Of Gems 3Dead Box Protein 20Dead Box Protein Dp 103Gemin-3 |
| Database Links | Reactome: R-HSA-191859Reactome: R-HSA-9754678 |
| Cellular Localisation | CytoplasmNucleusGemLocalized In Subnuclear Structures Next To Coiled BodiesCalled Gemini Of Cajal Bodies (Gems) |
| Alternative Protein Names | Probable Atp-Dependent Rna Helicase Ddx20 proteinComponent Of Gems 3 proteinDead Box Protein 20 proteinDead Box Protein Dp 103 proteinGemin-3 proteinDDX20 proteinDP103 proteinGEMIN3 protein |
Information sourced from Uniprot.org
