Rabbit Polyclonal Histone H2A.X (Phospho-Ser139) antibody (STJ97186)


Reactivity: Human, Mouse, Rat
Applications: WB
Conjugation: Unconjugated
Supplier: St John’s Laboratory Ltd.

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Rabbit Polyclonal Histone H2A.X (Phospho-Ser139) antibody (STJ97186)

Supplier: St John’s Laboratory Ltd.

Recommended applications: WB

Recommended dilution: WB 1:1000-2000

Recommended protocols: check protocols

Image descriptions:

Click or hover above images to see image description for Histone H2A.X (Phospho Ser139) Polyclonal Antibody.

Alternative names:

Check alternative names for the antibody


H2AFX antibody, H2AX antibody,|AW228881 antibody|H2A histone family member X antibody|H2A.FX antibody|H2A.X antibody|H2a/x antibody|H2AFX antibody|H2AX antibody|H2AX histone antibody|H2AX_HUMAN antibody|Hist5.2ax antibody|Histone 2A antibody|Histone 2AX antibody|Histone H2A.X antibody|Histone H2AX antibody|RGD1566119 antibody|Anti-Histone H2A.X antibody – ChIP Grade (ab11175)
SCBT cat No: sc-54607|



Histone H2A.X (Phospho Ser139) Polyclonal Antibody

Catalogue No.



Human, Mouse, Rat


The antibody detects endogenous Histone H2A.X (PhosphoSer139) protein.


Synthetic Peptide





Recommended dilution

WB 1:1000-2000








Histone H2A.X (Phospho Ser139) Antibody was tube-contained. PBS, pH 7.4, containing 0.02% sodium azide as Preservative and 50% Glycerol.


Histone H2A.X (Phospho Ser139) Antibody was affinity-purified from rabbit antiserum by affinity-chromatography using specific immunogen.


-20 Celsius degree. Avoid repeated freeze/thaw cycles.

Alternative antibody names

Histone H2AX antibody, H2a/x antibody, Histone H2A.X antibody

Database links

Human UniProt/Swiss-Prot:P16104;Mouse UniPort/Swiss-Prot: P27661;Rat UniProt/Swiss-Port: D3ZXP3;Human Entrez Gene: 3014;Mouse Entrez Gene: 15270;Rat Entrez Gene: Rn.2850

Protein names

Histone H2AX , H2a/x , Histone H2A.X

Protein function

Variant histone H2A which replaces conventional H2A in a subset of nucleosomes. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling. Required for checkpoint-mediated arrest of cell cycle progression in response to low doses of ionizing radiation and for efficient repair of DNA double strand breaks (DSBs) specifically when modified by C-terminal phosphorylation.

Protein tissue specificity

Synthesized in G1 as well as in S-phase.

Protein sequence and domain

The [ST]-Q motif constitutes a recognition sequence for kinases from the PI3/PI4-kinase family. / Belongs to the histone H2A family.

Protein post-translational modifications

Phosphorylated on Ser-140 (to form gamma-H2AX or H2AX139ph) in response to DNA double strand breaks (DSBs) generated by exogenous genotoxic agents and by stalled replication forks, and may also occur during meiotic recombination events and immunoglobulin class switching in lymphocytes. Phosphorylation can extend up to several thousand nucleosomes from the actual site of the DSB and may mark the surrounding chromatin for recruitment of proteins required for DNA damage signaling and repair. Widespread phosphorylation may also serve to amplify the damage signal or aid repair of persistent lesions. Phosphorylation of Ser-140 (H2AX139ph) in response to ionizing radiation is mediated by both ATM and PRKDC while defects in DNA replication induce Ser-140 phosphorylation (H2AX139ph) subsequent to activation of ATR and PRKDC. Dephosphorylation of Ser-140 by PP2A is required for DNA DSB repair. In meiosis, Ser-140 phosphorylation (H2AX139ph) may occur at synaptonemal complexes during leptotene as an ATM-dependent response to the formation of programmed DSBs by SPO11. Ser-140 phosphorylation (H2AX139ph) may subsequently occurs at unsynapsed regions of both autosomes and the XY bivalent during zygotene, downstream of ATR and BRCA1 activation. Ser-140 phosphorylation (H2AX139ph) may also be required for transcriptional repression of unsynapsed chromatin and meiotic sex chromosome inactivation (MSCI), whereby the X and Y chromosomes condense in pachytene to form the heterochromatic XY-body. During immunoglobulin class switch recombination in lymphocytes, Ser-140 phosphorylation (H2AX139ph) may occur at sites of DNA-recombination subsequent to activation of the activation-induced cytidine deaminase AICDA. Phosphorylation at Tyr-143 (H2AXY142ph) by BAZ1B/WSTF determines the relative recruitment of either DNA repair or pro-apoptotic factors. Phosphorylation at Tyr-143 (H2AXY142ph) favors the recruitment of APBB1/FE65 and pro-apoptosis factors such as MAPK8/JNK1, triggering apoptosis. In contrast, dephosphorylation of Tyr-143 by EYA proteins (EYA1, EYA2, EYA3 or EYA4) favors the recruitment of MDC1-containing DNA repair complexes to the tail of phosphorylated Ser-140 (H2AX139ph). / Monoubiquitination of Lys-120 (H2AXK119ub) by RING1 and RNF2/RING2 complex gives a specific tag for epigenetic transcriptional repression (By similarity). Following DNA double-strand breaks (DSBs), it is ubiquitinated through ‘Lys-63’ linkage of ubiquitin moieties by the E2 ligase UBE2N and the E3 ligases RNF8 and RNF168, leading to the recruitment of repair proteins to sites of DNA damage. Ubiquitination at Lys-14 and Lys-16 (H2AK13Ub and H2AK15Ub, respectively) in response to DNA damage is initiated by RNF168 that mediates monoubiquitination at these 2 sites, and ‘Lys-63’-linked ubiquitin are then conjugated to monoubiquitin; RNF8 is able to extend ‘Lys-63’-linked ubiquitin chains in vitro. H2AK119Ub and ionizing radiation-induced ‘Lys-63’-linked ubiquitination (H2AK13Ub and H2AK15Ub) are distinct events. / Acetylation at Lys-37 increases in S and G2 phases. This modification has been proposed to play a role in DNA double-strand break repair (By similarity).

Protein cellular localization

Nucleus / Chromosome

Research area

All research areas>Transcription Regulators>Histone
(View all antibody categories related to Transcription Regulators)


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St John’s Laboratory Ltd.

Product type

Primary antibody


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Antibody customer reviews & validation data - 109

Validation data ID: 109

Submission date: 2017-02-08

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Result figure:
Result figure

Figure description:

The figure provided shows the bands obtained from MDA-MB-468, H1299 and DCIS cells. Only the control cells were indicated in the names because of the confidentiality. The bands appear to be specific. An incresae in the protein was detected in lane 4 and lane 8 as expected.

Product name

Anti-histone H2A.X (Phospho-Ser139) antibody (Rabbit Polyclonal)

Product catalog No.


Product type

Primary antibody


St John's Laboratory Ltd

Application type

Western Blot

Antibody specificity rating


Antibody overall rating


Your comments

Breast and lung cancer cell lines with various treatments were tested for this antibody. With regular ECL a band was barely detected at 20 minutes. With super signal pretty clean bands were obtained.

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