U2 Small Nuclear RNA Auxiliary Factor 1 (U2AF1) Human Recombinant Protein

This gene belongs to the splicing factor SR family of genes. U2 auxiliary factor, comprising a large and a small subunit, is a non-snRNP protein required for the binding of U2 snRNP to the pre-mRNA branch site. This gene encodes the small subunit which plays a critical role in both constitutive and enhancer-dependent RNA splicing by directly mediating interactions between the large subunit and proteins bound to the enhancers. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

U2AF1: Plays a critical role in both constitutive and enhancer- dependent splicing by mediating protein-protein interactions and protein-RNA interactions required for accurate 3'-splice site selection. Recruits U2 snRNP to the branch point. Directly mediates interactions between U2AF2 and proteins bound to the enhancers and thus may function as a bridge between U2AF2 and the enhancer complex to recruit it to the adjacent intron. Belongs to the splicing factor SR family. 4 isoforms of the human protein are produced by alternative splicing.

Protein type: RNA-binding; RNA splicing; Spliceosome; RNA processing

Chromosomal Location of Human Ortholog: 21q22.3

Cellular Component: nucleoplasm; spliceosome; Cajal body; nuclear speck

Molecular Function: RS domain binding; protein binding; metal ion binding; nucleotide binding

Biological Process: transcription from RNA polymerase II promoter; nuclear mRNA splicing, via spliceosome; mRNA export from nucleus; RNA splicing; gene expression; mRNA 3'-end processing; mRNA processing; termination of RNA polymerase II transcription