• Product name

    Anti-KDM4A / JHDM3A / JMJD2A antibody
    See all KDM4A / JHDM3A / JMJD2A primary antibodies
  • Description

    Rabbit polyclonal to KDM4A / JHDM3A / JMJD2A
  • Host species

  • Tested applications

    Suitable for: ICC/IF, IP, ChIP, WBmore details
  • Species reactivity

    Reacts with: Human
    Predicted to work with: Rat
  • Immunogen

    Recombinant fragment, corresponding to amino acids 592-720 of Human JMJD2A

  • Positive control

    • HeLa cell nuclear lysate.



Our Abpromise guarantee covers the use of ab24545 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 at an assay dependent concentration.
IP Use at an assay dependent dilution.
ChIP Use at an assay dependent dilution.
WB 1/2000. Detects a band of approximately 130 kDa (predicted molecular weight: 120 kDa).


  • Function

    Histone demethylase that specifically demethylates 'Lys-9' and 'Lys-36' residues of histone H3, thereby playing a central role in histone code. Does not demethylate histone H3 'Lys-4', H3 'Lys-27' nor H4 'Lys-20'. Demethylates trimethylated H3 'Lys-9' and H3 'Lys-36' residue, while it has no activity on mono- and dimethylated residues. Demethylation of Lys residue generates formaldehyde and succinate. Participates in transcriptional repression of ASCL2 and E2F-responsive promoters via the recruitment of histone deacetylases and NCOR1, respectively.
    Isoform 2: Crucial for muscle differentiation, promotes transcriptional activation of the Myog gene by directing the removal of repressive chromatin marks at its promoter. Lacks the N-terminal demethylase domain.
  • Tissue specificity

  • Sequence similarities

    Belongs to the JHDM3 histone demethylase family.
    Contains 1 C2HC pre-PHD-type zinc finger.
    Contains 1 JmjC domain.
    Contains 1 JmjN domain.
    Contains 2 PHD-type zinc fingers.
    Contains 2 Tudor domains.
  • Domain

    The 2 Tudor domains recognize and bind methylated histone H3 'Lys-4' residue (H3K4me). Double Tudor domain has an interdigitated structure and the unusual fold is required for its ability to bind methylated histone tails. Trimethylated H3 'Lys-4' (H3K4me3) is bound in a cage of 3 aromatic residues, 2 of which are from the Tudor domain 2, while the binding specificity is determined by side-chain interactions involving residues from the Tudor domain 1. The Tudor domains are also able to bind trimethylated histone H3 'Lys-9' (H3K9me3), di- and trimethylated H4 'Lys-20' (H4K20me2 and H4K20me3). Has high affinity for H4K20me2, blocking recruitment of proteins such as TP53BP1.
  • Post-translational

    Ubiquitinated by RNF8 and RNF168 following DNA damage, leading to its degradation. Degradation promotes accessibility of H4K20me2 mark for DNA repair protein TP53BP1, which is then recruited.
  • Cellular localization

  • Information by UniProt
  • Database links

  • Alternative names

    • JHDM3A antibody
    • JmjC domain containing histone demethylation protein 3A antibody
    • JmjC domain-containing histone demethylation protein 3A antibody
    • JMJD2 antibody
    • JMJD2A antibody
    • jumonji C domain containing histone demethylase 3A antibody
    • Jumonji domain containing 2 antibody
    • Jumonji domain containing 2A antibody
    • Jumonji domain containing protein 2A antibody
    • Jumonji domain-containing protein 2A antibody
    • KDM4A antibody
    • KDM4A_HUMAN antibody
    • KIAA0677 antibody
    • Lysine (K) specific demethylase 4A antibody
    • Lysine-specific demethylase 4A antibody
    • TDRD14A antibody
    • Tudor domain containing 14A antibody
    see all



This product has been referenced in:

  • Dobrynin G  et al. KDM4A regulates HIF-1 levels through H3K9me3. Sci Rep 7:11094 (2017). Read more (PubMed: 28894274) »
  • Garcia J & Lizcano F KDM4C Activity Modulates Cell Proliferation and Chromosome Segregation in Triple-Negative Breast Cancer. Breast Cancer (Auckl) 10:169-175 (2016). ICC/IF ; Human . Read more (PubMed: 27840577) »
See all 12 Publications for this product

Customer reviews and Q&As

1-6 of 6 Abreviews or Q&A

Immunocytochemistry/ Immunofluorescence
Human Cell (HeLa)
Yes - 0.5% Triton-X100 in PBS

Dr. Kirk Mcmanus

Verified customer

Submitted Feb 27 2015


I'm sorry to hear that ab24545 did not work for you in western blot.

As you requested, I have set up an Order 1217875 for ab70786 free of charge. The only vial in stock is being transported to the US, and the expected delivery date to you is ***

Please do not hesitate to contact us with any further questions.

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Thank you for your response and detailed protocol description.

Did you try lowering the exposure time of the film until the background luminescence was gone? Also, please respond if you would like a replacement vial of the same antibody, a different antibody, or a refund.

I look forward to your reply, your information will be added to our internal notes and is greatly appreciated.

Read More


Thank you for contacting Abcam.

Based on the image sent for ab24545, there is definitely non-specific binding occurring. In order to block some of the non-specific binding, please attempt the troubleshooting steps listed below, so we can determine whether the antibody is properly recognizing its immunogen. If you have already performed these troubleshooting steps, please reply with details regarding your sample, protocol and troubleshooting steps that have been taken. These will not only help me to fully understand the problem but are essential should further testing of this product be needed as well. Could you also provide the Abcam order confirmation number or the PO and date of purchase for this product?

Blocking of non-specific binding might be absent or insufficient.
Increase the blocking incubation period and consider changing blocking agent. Abcam recommends 5% non-fat dry milk, 3% BSA, or normal serum for 30 min. These can be included in the antibody buffers as well.

The primary antibody concentration may be too high.
Titrate the antibody to the optimal concentration, incubate for longer but in more dilute antibody (a slow but targeted binding is best).

Incubation temperature may be too high.
Incubate blot at 4°C.

The secondary antibody may be binding non-specifically or reacting with the blocking reagent.
Run a secondary control without primary antibody. This is probably not the issue since I'm assuming you used the same secondary antibody for ab17721 which worked well.

Cross-reaction between blocking agent and primary or secondary.
Add a mild detergent such as Tween20 to the incubation and washing buffer (phospho-specific protein). Milk contains casein which is a phosphoprotein; this is why it causes high background because the phospho-specific antibody detects the casein present in the milk. Use BSA as a blocking reagent instead of milk.

Washing of unbound antibodies may be insufficient.
You have already attempted this troubleshooting step which did not solve the problem.

Your choice of membrane may give high background.
Your background for the other antibody looks fine, so it should not be the membrane.

The membrane has dried out.
Probably not the case since your other antibody staining was clean.

If these troubleshooting steps do not solve the problem we will refund or replace your product as stated in our AbPromise guarantee if the antibody is being used in the applications / species listed on the datasheet.

I hope this information is helpful to you. Please do not hesitate to contact us if you need any more advice or information.

Free Rabbit monoclonal antibody with any purchase of a primary antibody, while stocks last! Quote “RABMAB-XBSMG” in your next primary antibody order. For more information, visit the following link:

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Western blot
Human Cell lysate - nuclear (HL60 and HeLa)
Loading amount
100 µg
HL60 and HeLa
Blocking step
BSA as blocking agent for 2 hour(s) and 0 minute(s) · Concentration: 5% · Temperature: 25°C

Abcam user community

Verified customer

Submitted Oct 23 2007


Thank you for your enquiry. I am sorry to hear that you have been experiencing problems with ab24545 in western blot. Often it is possible to make suggestions that help resolve problems. We will happily offer technical support and in the event that a product is not functioning in the applications cited on the product data sheet (and the problem has been reported within 120 days of purchase), and if it appears that the antibody is at fault, a free replacement/credit note/refund will be offered. I can confirm that this product will work well in human samples. However, it has yet to be tested in mouse samples and we can not guarantee you will obtain good results. I have looked through the protocols you used and have a few questions and suggestions that might help you resolve the problem. - One of the most common cause of non-specific bands is there is an over loading of protein. We recommend using 20-40ug per well. This will eliminate the non-specific bands. One other reason is that the protein target may form multimers. Try boiling in SDS-Page for 10 minutes rather than 5 minutes to disrupt multimers. - The target in your protein sample might have been digested (more likely if the bands are of lower molecular weight). Please make sure that you incorporate sufficient and fresh protease inhibitors in your sample buffer. - As this antibody is supposed to detect a band of approximately 120-130kDa, using an 8% gel is recommended so that the proper molecular weight proteins can be separated accordingly. - At Abcam, almost all of our products has been tested with 5% BSA. Sometimes, a different blocking buffer might cause cross reaction between the blocking agent and antibodies, therefore causing weak bands or no bands at all. I would recommend trying 5% BSA, if you have not already done so. - Can you confirm that the second antibody you used also managed to produce good results with other primary antibodies? Could it be causing the weak signal? Are the non-specific bands weak or strong? If the non-specific bands are stronger, then the protein of interest is not abundantly present in the cell extract. - How much Tween was in the TBST solution? In general, a 0.05% TBST would be sufficient as a washing buffer. Also, was the washing done 15min x 3 times? This is because over washing will eventually cause you to lose signals and insufficient washes will not be able to rid the non-specific bands. I am sorry for the string of questions but I hope the above recommendations may already help you. If you have already tried the above suggestions and still experience problems, please do not hesitate to contact me with the answers to the above (including an image), and details of your order (contact information, shipping address/purchasing agent, etc.). Also, please advice me on how you would like to proceed with your enquiry, so that I can immediately arrange for a replacement or refund for you.

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