Component of the spliceosomal U1 snRNP, which is essential for recognition of the pre-mRNA 5' splice-site and the subsequent assbly of the spliceosome. U1 snRNP is the first snRNP to interact with pre-mRNA. This interaction is required for the subsequent binding of U2 snRNP and the U4,U6,U5 tri-snRNP. SNRPA binds st loop II of U1 snRNA. In a snRNP-free form (SF-A) may be involved in coupled pre-mRNA splicing and polyadenylation process. May bind preferentially to the 5'-UGCAC-3' motif on RNAs.
Structure, chromosomal localization and evolutionary conservation of the gene encoding human U1 snRNP-specific A protein.Nelissen R.L.H., Sillekens P.T.G., Beijer R.P., Geurts van Kessel A.H.M., van Venrooij W.J.Gene 102:189-196(1991)
Research Topic:Transcription