• Product nameAnti-SFPQ antibody
    See all SFPQ primary antibodies
  • Description
    Mouse monoclonal to SFPQ
  • Tested applicationsSuitable for: Flow Cyt, WB, ELISAmore details
  • Species reactivity
    Reacts with: Mouse, Rat, Human
  • Immunogen

    Recombinant fragment: EEKISDSEGF KANLSLLRRP GEKTYTQRCR LFVGNLPADI TEDEFKRLFA KYGEPGEVFI NKGKGFGFIK LESRALAEIA KAELDDTPMR GRQ, corresponding to amino acids 269-362 of Human SFPQ (NP_005057) with tag.

  • Positive control
    • HeLa nuclear lysate; Recombinant tagged human SFPQ fragment.


  • FormLiquid
  • Storage instructionsShipped at 4°C. Upon delivery aliquot. Store at -20°C or -80°C. Avoid freeze / thaw cycle.
  • Storage bufferPreservative: None
    Constituents: 1X PBS, pH 7.2
  • Concentration information loading...
  • PurityProtein A purified
  • ClonalityMonoclonal
  • IsotypeIgG2a
  • Light chain typekappa
  • Research areas


Our Abpromise guarantee covers the use of ab76955 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
Flow Cyt Use 0.5µg for 106 cells. ab170191-Mouse monoclonal IgG2a, is suitable for use as an isotype control with this antibody.
WB Use a concentration of 1 - 5 µg/ml. Predicted molecular weight: 76 kDa.
ELISA Use at an assay dependent concentration. Detection limit for recombinant tagged SFPQ is approximately 0.3ng/ml when used as a capture antibody.


  • FunctionDNA- 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.
  • Involvement in diseaseNote=A chromosomal aberration involving SFPQ may be a cause of papillary renal cell carcinoma (PRCC). Translocation t(X;1)(p11.2;p34) with TFE3.
  • Sequence similaritiesContains 2 RRM (RNA recognition motif) domains.
  • Post-translational
    The N-terminus is blocked.
    Phosphorylated on multiple serine and threonine residues during apoptosis. In vitro phosphorylated by PKC. Phosphorylation stimulates binding to DNA and D-loop formation, but inhibits binding to RNA.
    Arg-7, Arg-9, Arg-19 and Arg-25 are dimethylated, probably to asymmetric dimethylarginine.
  • Cellular localizationNucleus matrix. Predominantly in nuclear matrix.
  • Information by UniProt
  • Database links
  • Alternative names
    • 100 kDa DNA pairing protein antibody
    • 100 kDa DNA-pairing protein antibody
    • 100 kDa subunit antibody
    • DNA binding p52/p100 complex 100 kDa subunit antibody
    • DNA-binding p52/p100 complex antibody
    • hPOMp100 antibody
    • Polypyrimidine tract binding protein associated splicing factor antibody
    • Polypyrimidine tract-binding protein-associated-splicing factor antibody
    • POMP100 antibody
    • PPP1R140 antibody
    • proline- and glutamine-rich antibody
    • Protein phosphatase 1 regulatory subunit 140 antibody
    • PSF antibody
    • PTB associated splicing factor antibody
    • PTB-associated-splicing factor antibody
    • Sfpq antibody
    • SFPQ_HUMAN antibody
    • Splicing factor antibody
    • Splicing factor proline and glutamine rich antibody
    • Splicing factor proline/glutamine rich (polypyrimidine tract binding protein associated) antibody
    • Splicing factor proline/glutamine rich antibody
    see all

Anti-SFPQ antibody images

  • Anti-SFPQ antibody (ab76955) at 1 µg/ml + Recombinant tagged human SFPQ fragment at 0.2 µg

    Goat anti-Mouse IgG (H&L)-HRP at 1/5000 dilution

    Predicted band size : 76 kDa
    Observed band size : 36 kDa (why is the actual band size different from the predicted?)
  • Anti-SFPQ antibody (ab76955) at 1 µg/ml + HeLa nuclear lysate at 25 µg

    Goat anti-Mouse IgG (H&L)-HRP at 1/2500 dilution

    Predicted band size : 76 kDa
    Observed band size : 100 kDa (why is the actual band size different from the predicted?)
  • Overlay histogram showing HeLa cells stained with ab76955 (red line). The cells were fixed with 80% methanol (5 min) and then permeabilized with 0.1% PBS-Tween for 20 min. The cells were then incubated in 1x PBS / 10% normal goat serum / 0.3M glycine to block non-specific protein-protein interactions followed by the antibody (ab76955, 0.5µg/1x106 cells) for 30 min at 22ºC. The secondary antibody used was DyLight® 488 goat anti-mouse IgG (H+L) (ab96879) at 1/500 dilution for 30 min at 22ºC. Isotype control antibody (black line) was mouse IgG2a [ICIGG2A] (ab91361, 1µg/1x106 cells) used under the same conditions. Acquisition of >5,000 events was performed. This antibody gave a positive signal in HeLa cells fixed with 4% paraformaldehyde (10 min)/permeabilized with 0.1% PBS-Tween for 20 min used under the same conditions.

References for Anti-SFPQ antibody (ab76955)

ab76955 has not yet been referenced specifically in any publications.

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