• Product nameAnti-COBRA1 antibody
    See all COBRA1 primary antibodies
  • Description
    Rabbit polyclonal to COBRA1
  • Tested applicationsSuitable for: ICC/IF, WB, IHC-Pmore details
  • Species reactivity
    Reacts with: Human
    Predicted to work with: Mouse, Chicken, Cow
  • Immunogen

    Synthetic peptide conjugated to KLH derived from within residues 300 - 400 of Human COBRA1.

    (Peptide available as ab48335.)

  • Positive control
    • ab48336 gave a positive signal in human liver tissue lysate.


  • FormLiquid
  • Storage instructionsShipped at 4°C. Store at +4°C short term (1-2 weeks). Upon delivery aliquot. Store at -20°C or -80°C. Avoid freeze / thaw cycle.
  • Storage bufferPreservative: 0.02% Sodium Azide
    Constituents: 1% BSA, PBS, pH 7.4
  • Concentration information loading...
  • PurityImmunogen affinity purified
  • ClonalityPolyclonal
  • IsotypeIgG
  • Research areas


Our Abpromise guarantee covers the use of ab48336 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
ICC/IF Use a concentration of 1 µg/ml.
WB Use a concentration of 1 µg/ml. Detects a band of approximately 61 kDa (predicted molecular weight: 66 kDa).
IHC-P Use at an assay dependent concentration. Perform heat mediated antigen retrieval before commencing with IHC staining protocol.


  • RelevanceCOBRA1 is an essential component of the NELF complex, a complex that negatively regulates the elongation of transcription by RNA polymerase II. The NELF complex causes transcriptional pausing and is counteracted by the P-TEFb kinase complex. It may be able to induce chromatin unfolding.
  • Cellular localizationNuclear
  • Database links
  • Alternative names
    • A730008L03Rik antibody
    • AB041607 antibody
    • AI663983 antibody
    • Cofactor of BRCA1 antibody
    • DKFZp586B0519 antibody
    • KIAA1182 antibody
    • Negative elongation factor B antibody
    • Negative elongation factor protein B antibody
    • Nelf b antibody
    • NELF-B antibody
    • NELFB antibody
    • RGD1307832 antibody
    • RP13-122B23.3 antibody
    • RP23-132N23.4 antibody
    see all

Anti-COBRA1 antibody images

  • Anti-COBRA1 antibody (ab48336) at 1 µg/ml + Human liver tissue lysate - total protein (ab29889) at 10 µg

    IRDye 680 Conjugated Goat Anti-Rabbit IgG (H+L) at 1/10000 dilution

    Performed under reducing conditions.

    Predicted band size : 66 kDa
    Observed band size : 61 kDa (why is the actual band size different from the predicted?)
    Additional bands at : 37 kDa. We are unsure as to the identity of these extra bands.
  • ICC/IF image of ab48336 stained human MCF7 cells. The cells were 4% PFA fixed (10 min), permabilised in 0.1% PBS-Tween (20 min) and incubated with the antibody (ab48336, 1µg/ml) for 1h at room temperature. 1%BSA / 10% normal goat serum / 0.3M glycine was used to block non-specific protein-protein interactions. The secondary antibody (green) was Alexa Fluor® 488 goat anti-rabbit IgG (H+L) used at a 1/1000 dilution for 1h. Alexa Fluor® 594 WGA was used to label plasma membranes (red). DAPI was used to stain the cell nuclei (blue). This antibody also gave a positive IF result in HeLa, HEK 293 and HepG2 cells.

References for Anti-COBRA1 antibody (ab48336)

This product has been referenced in:
  • Luo M  et al. A conserved protein motif is required for full modulatory activity of negative elongation factor subunits NELF-A and NELF-B in modifying glucocorticoid receptor-regulated gene induction properties. J Biol Chem 288:34055-72 (2013). WB . Read more (PubMed: 24097989) »

See 1 Publication for this product

Product Wall

Abcam guarantees this product to work in the species/application used in this Abreview.
Application Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections)
Sample Human Tissue sections (liver)
Specification liver
Fixative Formaldehyde
Antigen retrieval step Heat mediated - Buffer/Enzyme Used: citrate buffer pH6.0
Permeabilization No
Blocking step Sequential peroxidase (5min) and protein (10min) block (prediluted) as blocking agent for 15 minute(s) · Concentration: 100% · Temperature: 20°C

Mr. Antibody Solutions

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Submitted Aug 19 2008