• Product name

  • Description

    Rabbit polyclonal to SPEN
  • Host species

  • Tested applications

    Suitable for: WB, IPmore details
  • Species reactivity

    Reacts with: Human
    Predicted to work with: Mouse, Rabbit, Horse, Guinea pig, Dog, Chimpanzee, Rhesus monkey, Gorilla, Orangutan, Elephant
  • Immunogen

    Synthetic peptide from a region between residue 1350 and 1400 of human SPEN, NP_055816.2.

  • Positive control

    • Whole cell lysate from Hela cells.



Our Abpromise guarantee covers the use of ab72266 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
  • Application notes
    IP: Use at 2-5µg/mg of lysate.
    WB: Use at a concentration of 1 µg/ml in enriched samples (ie. immunoprecipitates). Predicted molecular weight: 402 kDa. Not suitable for WB in crude samples.

    Not yet tested in other applications.
    Optimal dilutions/concentrations should be determined by the end user.
  • Target

    • Relevance

      SPEN is an essential corepressor protein, which probably regulates different key pathways such as the Notch pathway. It is a negative regulator of the Notch pathway via its interaction with RBPSUH, which prevents the association between NOTCH1 and RBPSUH, and therefore suppresses the transactivation activity of Notch signaling. SPEN blocks the differentiation of precursor B-cells into marginal zone B-cells. It probably represses transcription via the recruitment of large complexes containing histone deacetylase proteins. SPEN may bind both to DNA and RNA.
    • Cellular localization

      Nuclear. Associates with chromatin.
    • Database links

    • Alternative names

      • MINT antibody
      • Nuclear receptor transcription cofactor antibody
      • RBM15C antibody
      • SHARP antibody
      • SPEN homolog antibody
      • Spen homolog transcriptional regulator antibody
      see all


    • Immunoprecipitation/ Western Blot of SPEN.
      Lane 1: ab72266 at 3µg/mg whole cell lysate.
      Lane 2: Control IgG.
      ab72266 at 1µg/ml for WB.
      Whole cell lysate from Hela cells at 1mg for IP, 20% of IP loaded.
      Chemiluminescence with an exposure time of 3 minutes.


    ab72266 has not yet been referenced specifically in any publications.

    Customer reviews and Q&As

    1-2 of 2 Abreviews or Q&A


    I have copied the protocols for IP and WB below. Please note these are a guideline only and may require some individual optimization.

    I am happy to answer any further questions you have.

    Immunoprecipitation Protocol

    Reagents Needed:

    Immunoprecipitation (IP) lysis buffer

    Protease Inhibitors

    Primary Antibodies made in Rabbit

    Normal IgG, negative control

    Protein A Sepharose Beads

    Cell Lysate

    Sample Buffer

    IP lysis Buffer

    12.5 ml 1M NaCl (250mM)

    2.5 ml 1M Tris (50mM)

    500ul 0.5M EDTA (5mM)

    2.5ml 10% NP-40

    32 ml dH20

    Protein A Beads

    Resuspend 400 mg of Protein A beads in 10 ml of distilled H2O. Mix well to resuspend. Spin at 250 rpm for 5 minutes. Wash 3X in 10 ml IP Lysis buffer. Resuspend to 10 ml with IP lysis buffer for a 20% solution. Use 100 mcl per IP reaction.

    4X Sample Buffer

    Glycerol 4.0 g

    Tris Base 0.68 g

    Tris HCL 0.67 g

    LDS 0.80 g

    EDTA 6 mg

    Brilliant Blue G250 2.5 mg

    Phenol red 2.5 mg

    Adjust volume to 10 ml with ultra pure water.

    Store at 4oC.

    1X Sample Buffer

    4X sample buffer 150 mcl

    1M DTT 60 mcl

    Distilled water 390 mcl

    Make fresh for each use.


    1. Prepare cell lysate according to protocol. Place 500 mcl of the prepared cell lysate (1-3 mg/ml) into a 1.5 ml micro-centrifuge tube.

    2. To this tube add 2 to 10 mcg of the primary antibody (If using neat sera or an IgG fraction such as Protein-A purified antibody, larger amounts are likely to be required. For best results, optimal amounts of antibody should be empirically defined.)

    3. To a negative control reaction, add an equivalent amount of normal rabbit IgG.

    4. Add 100 mcl of a 20% Protein A suspension.(Amersham Biosciences, Cat# 17-0780-01) to the mixture of antibody and cell lysate. Rotate the immunoprecipitation reactions (end-to-end) for 3 hours at room temperature or overnight at 4 C.

    5. Centrifuge (200 x g; 5 minutes) to pellet the complex.

    6. Remove the supernatant and add 500 mcl cold cell lysis buffer. Centrifuge (200 x g; 5 minutes).

    7. Repeat wash step 6 twice more. After each centrifugation remove as much of the supernatant as possible.

    8. After removing the supernatant from the third wash, add 40 mcl of freshly prepared 1X sample buffer to each tube and heat at 90 C for 5 minutes.

    9. Continue with electrophoresis and immunoblotting as described under western blotting protocol. Load 8 to 16 mcl (20 to 40% of the IP reaction) to a polyacrylamide gel.

    Note: For optimal results, complete reduction of the sample is required. We recommend the use of 0.1 M DTT in SDS-PAGE sample buffer and immediately heating samples, loading and running gels.

    Western Blot Protocol

    Reagents Needed:

    20X Running Buffer

    Tricine (free base) 71.7 g

    Tris (free base) 72.6 g

    SDS 10.0 g

    Sodium Bisulfite 2.5 g

    Adjust to 500 ml with ultra pure water.

    Store at 4oC. For 1X Running Buffer, add 10 ml of 20X Running Buffer to 190 ml of distilled water.

    10X Transfer Buffer

    Tris (free base) 15.2 g

    Glycine 72.1 g

    SDS 5.0 g

    Ultra pure water to 500 ml

    Store at 4oC.

    1X Transfer Buffer

    10X Transfer Buffer 50 ml

    Methanol 100 ml

    Distilled water 350 ml

    Make fresh for each use.

    5% non-fat dry milk in TBSTCarnation non-fat dry milk 50 g

    TBST 1 liter

    TBST (Tris Buffered Saline with Tween 20, pH8.0)

    Tris 6.1 g

    NaC l 8.68 g

    Tween-20 500 mcl

    Adjust the volume to 1 liter with distilled water. Adjust pH to 8.0 with HCL.

    Store at 4-25oC.

    Electrophoresis in SDS-Polyacrylamide Gel and Transfer to Nitrocellulose:

    Many of the reagents for these procedures are commercially available. Sources that are preferred by Bethyl Laboratories, Inc. are:

    Polyacrylamide gels (4-12% Tricine), running buffer and transfer buffer from PAGEgel

    Nitrocellulose membranes

    1. Cut open the package that contains the gel cassette and drain away the buffer.

    2. Rinse the wells with distilled water.

    3. Rinse the wells with fresh 1x running buffer.

    4. Place the gels on the buffer core so that the shorter plates face inward. If only using one gel, use a buffer dam to seal the other side.

    5. Fill the inner core with fresh 1X running buffer. If there are no leaks, fill the outer core with running buffer. Load samples.

    6. Run the gels at 150V until the dye front reaches the bottom of the gel (approximately 60 minutes).

    7. Soak nitrocellulose membrane and blotting paper in 1X transfer buffer for at least 5 minutes prior to opening gel cassette.

    8. Open gel cassettes and place the gel on the nitrocellulose membrane sandwiched between two pieces of blotting paper.

    9. Place in transfer apparatus and fill with fresh 1X transfer buffer.

    10. Run transfer apparatus for 60-75 minutes on 35V.

    Western Blotting:

    1. Remove the membrane from the transfer apparatus and place in 20 ml of 5% non-fat dry milk in TBST for one hour, with gentle shaking.

    2. Dilute the primary antibody in 15 ml of 5% non-fat dry milk in TBST. For best results, the optimal dilution of antibody should be empirically defined.

    3. Incubate the membrane in diluted primary antibody for two hours to overnight with gentle shaking at room temperature.

    4. Wash the membrane three times, 10 minutes each time in TBST.

    5. Dilute the secondary HRP conjugated antibody in 15 ml of reconstituted 5% non-fat dry milk in TBST. For best results, the optimal concentration of the secondary HRP conjugated antibody should be empirically defined.

    6. Incubate the membrane in diluted anti-Rabbit IgG-HRP Conjugate or anti-Goat IgG-HRP Conjugate for 60 minutes.

    Wash as directed in step 4.

    7. Develop blots with substrate solution and place in plastic membrane protector.

    8. Expose membrane to film or CCD camera.

    Read More


    Thank you very much for your interest in ab72266. The immunogen for this antibody is 86% homologous with the mouse SPEN protien (UniProt: Q62504). Based on this information, there is a good chance that ab72266 will detect mouse SPEN, but this has not been validated. Therefore, I can offer a discount off a future purchase if you buy ab72266 now, test it in mouse and submit feedback to us in the form of an Abreview. It doesn’t matter whether the Abreview is positive or negative, we would just really like to receive your feedback. The discount would be to the value of: 1 free primary antibody.
    If you are interested in this offer, please follow these steps:
    1. Reply to this e-mail to let me know that you would like to proceed and test ab72266 in mouse. I will then send a discount code. This code must be issued before purchasing ab72266 so please wait for my reply before ordering.
    2. Purchase ab72266 either by phone, fax, or online (www.abcam.com).
    3. Test it in mouse.
    4. Let us know the results, positive or negative, using our Abreview system (this will take about 10 minutes and images are great if you have them!). To find out how to submit an Abreview, please visit: https://www.abcam.com/abreviews.
    5. After the review is submitted to us, the discount code becomes active. Simply place your new order by phone, fax, or on the web and mention the discount code. The discount can be redeemed for any primary antibody ordered and the discount code is valid for 4 months after issue.
    Please remember that submission of the Abreview is sufficient for the discount code to become active.
    We are always pleased to obtain feedback about our products and any information is greatly appreciated! Even if ab72266 turns out to be unsuitable for mouse, you will still receive the discount on your next purchase after your Abreview has been submitted.
    Please let me know if you have any questions about this offer and I would be happy to help you further.
    The Terms and Conditions of this offer can be found at: www.abcam.com/collaborationdiscount.

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