This gene encodes subunit 1 of the splicing factor 3a protein complex. The splicing factor 3a heterotrimer includes subunits 1, 2 and 3 and is necessary for the in vitro conversion of 15S U2 snRNP into an active 17S particle that performs pre-mRNA splicing. Subunit 1 belongs to the SURP protein family; named for the SURP motifs that are thought to mediate RNA binding. Subunit 1 has tandemly repeated SURP motifs in its amino-terminal half while its carboxy-terminal half contains a proline-rich region and a ubiquitin-like domain. Binding studies with truncated subunit 1 derivatives demonstrated that the two SURP motifs are necessary for binding to subunit 3 while contacts with subunit 2 may occur through sequences carboxy-terminal to the SURP motifs. Alternative splicing results in multiple transcript variants encoding different isoforms.
Protein Aliases: pre-mRNA processing 21; pre-mRNA splicing factor SF3a (120 kDa subunit); SAP 114; SF3a120; Spliceosome-associated protein 114; splicing factor 3 subunit 1; Splicing factor 3A subunit 1; splicing factor 3a, subunit 1, 120kD; splicing factor 3a, subunit 1, 120kDa
Gene Aliases: PRP21; PRPF21; SAP114; SF3A1; SF3A120
UniProt ID: (Human) Q15459
Entrez Gene ID: (Human) 10291
Molecular Function: RNA splicing factor