Anti-SF2/SRSF1 Antibody Picoband® Fluoro488 Conjugated

SF2, also known as Serine/arginine-rich splicing factor 1 (SRSF1), is a protein that in humans is encoded by the SFRS1 gene. This gene encodes a member of the arginine/serine-rich splicing factor protein family. There is a pseudogene of this gene on chromosome 13. The encoded protein can either activate or repress splicing, depending on its phosphorylation state and its interaction partners. Multiple transcript variants have been found for this gene. ASF/SF2 is necessary for all splicing reactions to occur, and influences splice site selection in a concentration-dependent manner, resulting in alternative splicing.

Serine/arginine-rich splicing factor 1; Alternative-splicing factor 1; ASF-1; Splicing factor, arginine/serine-rich 1; pre-mRNA-splicing factor SF2, P33 subunit; SRSF1; ASF, SF2, SF2P33, SFRS1; OK/SW-cl.3

Plays a role in preventing exon skipping, ensuring the accuracy of splicing and regulating alternative splicing. Interacts with other spliceosomal components, via the RS domains, to form a bridge between the 5'- and 3'-splice site binding components, U1 snRNP and U2AF. Can stimulate binding of U1 snRNP to a 5'-splice site-containing pre-mRNA. Binds to purine-rich RNA sequences, either the octamer, 5'-RGAAGAAC-3' (r=A or G) or the decamers, AGGACAGAGC/AGGACGAAGC. Binds preferentially to the 5'- CGAGGCG-3' motif in vitro. Three copies of the octamer constitute a powerful splicing enhancer in vitro, the ASF/SF2 splicing enhancer (ASE) which can specifically activate ASE-dependent splicing. Isoform ASF-2 and isoform ASF-3 act as splicing repressors. May function as export adapter involved in mRNA nuclear export through the TAP/NXF1 pathway. .

1. Entrez Gene: SFRS1 splicing factor, arginine/serine-rich 1 (splicing factor 2, alternate splicing factor) . 2. Michlewski G, Sanford JR, Cáceres JF (April 2008) . The splicing factor SF2/ASF regulates translation initiation by enhancing phosphorylation of 4E-BP1. Mol. Cell 30 (2) : 179–89. 3. Zuo P, Manley JL (December 1993) .Functional domains of the human splicing factor ASF/SF2. EMBO J. 12 (12) : 4727–37.