Splicing factor 1 is a nuclear pre-mRNA splicing factor. The protein specifically recognizes the intron branch point sequence at the 3' splice site, together with the large subunit of U2 auxiliary factor (U2AF), and is required for the early stages of spliceosome assembly. It also plays a role in nuclear pre-mRNA retention and transcriptional repression. The protein contains an N-terminal U2AF ligand motif, a central hnRNP K homology motif and quaking 2 region which bind a key branch-site adenosine within the branch point sequence, a zinc knuckles domain, and a C-terminal proline-rich domain. Alternative splicing results in multiple transcript variants.
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Protein Aliases: BBP; M ZFM1; Mammalian branch point-binding protein; Splicing factor 1; Transcription factor ZFM1; Zinc finger gene in MEN1 locus; Zinc finger protein 162
Gene Aliases: BBP; D11S636; MBBP; MZFM; SF1; WBP4; ZCCHC25; ZFM1; Zfp162; ZNF162
UniProt ID: (Human) Q15637
Molecular Function: RNA splicing factor