SFPQ, CT (SFPQ, PSF, Splicing factor, proline- and glutamine-rich, 100kD DNA-pairing protein, DNA-binding p52/p100 complex, 100kD subunit, Polypyrimidine tract-binding protein-associated-splicing factor) (APC)

DNA-and RNA binding protein, involved in several nuclear processes. Essential pre-mRNA splicing factor required early in spliceosome formation and for splicing catalytic step II, probably as an heteromer with NONO. Binds to pre-mRNA in spliceosome C complex, and specifically binds to intronic polypyrimidine tracts. Interacts with U5 snRNA, probably by binding to a purine-rich sequence located on the 3' side of U5 snRNA stem 1b. May be involved in a pre-mRNA coupled splicing and polyadenylation process as component of a snRNP-free complex with SNRPA/U1A. The SFPQ-NONO heteromer associated with MATR3 may play a role in nuclear retention of defective RNAs. SFPQ may be involved in homologous DNA pairing; in vitro, promotes the invasion of ssDNA between a duplex DNA and produces a D-loop formation. The SFPQ-NONO heteromer may be involved in DNA unwinding by modulating the function of topoisomerase I/TOP1; in vitro, stimulates dissociation of TOP1 from DNA after cleavage and enhances its jumping between separate DNA helices. The SFPQ-NONO heteromer may be involved in DNA nonhomologous end joining (NHEJ) required for double-strand break repair and V(D)J recombination and may stabilize paired DNA ends; in vitro, the complex strongly stimulates DNA end joining, binds directly to the DNA substrates and cooperates with the Ku70/G22P1-Ku80/XRCC5 (Ku) dimer to establish a functional preligation complex. SFPQ is involved in transcriptional regulation. Transcriptional repression is probably mediated by an interaction of SFPQ with SIN3A and subsequent recruitment of histone deacetylases (HDACs). The SFPQ-NONO/SF-1 complex binds to the CYP17 promoter and regulates basal and cAMP-dependent transcriptional avtivity. SFPQ isoform Long binds to the DNA binding domains (DBD) of nuclear hormone receptors, like RXRA and probably THRA, and acts as transcriptional corepressor in absence of hormone ligands. Binds the DNA sequence 5'-CTGAGTC-3' in the insulin-like growth factor response element (IGFRE) and inhibits IGF-I-stimulated transcriptional activity.\n\nApplications:\nSuitable for use in Western Blot, ELISA\n\nRecommended Dilution:\nELISA: 1:1,000\nWestern Blot: 1:100-500\n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. Aliquot to avoid repeated freezing and thawing. Do not freeze APC conjugates. Light sensitive. Aliquots are stable for 6 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.

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SPECIFICATIONS

Catalog Number

041622-APC

Size

200ul

Applications

ELISA, WB

Hosts

Rabbit

Reactivities

Hum

Form

Supplied as a liquid in PBS, pH 7.2. Contains ~0.09% sodium azide. Conjugated to Allophycocyanin (APC).

P Type

Pab

Purity

Purified by Protein A affinity chromatography.

Isotype

IgG

References

Heyd, F., et al. Mol. Cell 40(1):126-137(2010)\nMarko, M., et al. Exp. Cell Res. 316(3):390-400(2010)\nDavid, A., et al. Eur. J. Endocrinol. 162(1):37-42(2010)\nOlsen, J.V., et al. Cell 127(3):635-648(2006)\nOng, S.E., et al. Nat. Methods 1(2):119-126(2004)

Additional Info

Human

Alternative Names

SFPQ, PSF, Splicing factor, proline- and glutamine-rich, 100kD DNA-pairing protein, DNA-binding p52/p100 complex, 100kD subunit, Polypyrimidine tract-binding protein-associated-splicing factor