This antibody is specific for histone H3 tri-methylated at K27. The antibody is blocked in Western blot by tri methyl K27 peptide and slightly by di methyl K27 peptide (there is <12% cross reactivity with di methyl K27 as determined by ELISA). It is not blocked by mono methyl K4, di methyl K4, tri methyl K4, mono methyl K9, di methyl K9, tri methyl K9, mono methyl K27 or unmodified K27 peptides (see the peptide blocking assay blot below).
Synthetic peptide within Human Histone H3 aa 1-100 (tri methyl K27) conjugated to keyhole limpet haemocyanin (Sulfosuccinimidyl 4-N-maleimidomethyl-cyclohexane-1-carboxylate (Sulfo-SMCC)). The exact sequence is proprietary. Clones were positively screened by ELISA against the immunising peptide. Clones were negatively screened against both the unmodified peptide and also against tri methyl K9 Histone H3 peptide. (Peptide available as ab1782)
Western blot protocol advice:
For the blocking step, we recommend using 3% milk for 1 hour at room temperature. This step may need to be optimized depending on your experimental conditions.
This antibody clone [mAbcam 6002] is manufactured by Abcam. We have the following conjugates available:
Blocking: we recommend using 3% milk block for 1 hour at room temperature. This step may need to be optimized for your experiments.
Use at an assay dependent concentration.
Use a concentration of 5 µg/ml.
Core component of nucleosome. 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.
Belongs to the histone H3 family.
Expressed during S phase, then expression strongly decreases as cell division slows down during the process of differentiation.
Acetylation is generally linked to gene activation. Acetylation on Lys-10 (H3K9ac) impairs methylation at Arg-9 (H3R8me2s). Acetylation on Lys-19 (H3K18ac) and Lys-24 (H3K24ac) favors methylation at Arg-18 (H3R17me). Citrullination at Arg-9 (H3R8ci) and/or Arg-18 (H3R17ci) by PADI4 impairs methylation and represses transcription. Asymmetric dimethylation at Arg-18 (H3R17me2a) by CARM1 is linked to gene activation. Symmetric dimethylation at Arg-9 (H3R8me2s) by PRMT5 is linked to gene repression. Asymmetric dimethylation at Arg-3 (H3R2me2a) by PRMT6 is linked to gene repression and is mutually exclusive with H3 Lys-5 methylation (H3K4me2 and H3K4me3). H3R2me2a is present at the 3' of genes regardless of their transcription state and is enriched on inactive promoters, while it is absent on active promoters. Methylation at Lys-5 (H3K4me), Lys-37 (H3K36me) and Lys-80 (H3K79me) are linked to gene activation. Methylation at Lys-5 (H3K4me) facilitates subsequent acetylation of H3 and H4. Methylation at Lys-80 (H3K79me) is associated with DNA double-strand break (DSB) responses and is a specific target for TP53BP1. Methylation at Lys-10 (H3K9me) and Lys-28 (H3K27me) are linked to gene repression. Methylation at Lys-10 (H3K9me) is a specific target for HP1 proteins (CBX1, CBX3 and CBX5) and prevents subsequent phosphorylation at Ser-11 (H3S10ph) and acetylation of H3 and H4. Methylation at Lys-5 (H3K4me) and Lys-80 (H3K79me) require preliminary monoubiquitination of H2B at 'Lys-120'. Methylation at Lys-10 (H3K9me) and Lys-28 (H3K27me) are enriched in inactive X chromosome chromatin. Phosphorylated at Thr-4 (H3T3ph) by GSG2/haspin during prophase and dephosphorylated during anaphase. Phosphorylation at Ser-11 (H3S10ph) by AURKB is crucial for chromosome condensation and cell-cycle progression during mitosis and meiosis. In addition phosphorylation at Ser-11 (H3S10ph) by RPS6KA4 and RPS6KA5 is important during interphase because it enables the transcription of genes following external stimulation, like mitogens, stress, growth factors or UV irradiation and result in the activation of genes, such as c-fos and c-jun. Phosphorylation at Ser-11 (H3S10ph), which is linked to gene activation, prevents methylation at Lys-10 (H3K9me) but facilitates acetylation of H3 and H4. Phosphorylation at Ser-11 (H3S10ph) by AURKB mediates the dissociation of HP1 proteins (CBX1, CBX3 and CBX5) from heterochromatin. Phosphorylation at Ser-11 (H3S10ph) is also an essential regulatory mechanism for neoplastic cell transformation. Phosphorylated at Ser-29 (H3S28ph) by MLTK isoform 1, RPS6KA5 or AURKB during mitosis or upon ultraviolet B irradiation. Phosphorylation at Thr-7 (H3T6ph) by PRKCBB is a specific tag for epigenetic transcriptional activation that prevents demethylation of Lys-5 (H3K4me) by LSD1/KDM1A. At centromeres, specifically phosphorylated at Thr-12 (H3T11ph) from prophase to early anaphase, by DAPK3 and PKN1. Phosphorylation at Thr-12 (H3T11ph) by PKN1 is a specific tag for epigenetic transcriptional activation that promotes demethylation of Lys-10 (H3K9me) by KDM4C/JMJD2C. Phosphorylation at Tyr-42 (H3Y41ph) by JAK2 promotes exclusion of CBX5 (HP1 alpha) from chromatin. Monoubiquitinated by RAG1 in lymphoid cells, monoubiquitination is required for V(D)J recombination (By similarity). Ubiquitinated by the CUL4-DDB-RBX1 complex in response to ultraviolet irradiation. This may weaken the interaction between histones and DNA and facilitate DNA accessibility to repair proteins.
In mice, the X-inactivation process is reversed naturally by X-reactivation in blastocysts and germ cells and in culture in pluripotent stem cells. The image shows late blastocyst-stage mouse embryos consisting of three cell types: epiblast (NANOG-positive, cyan), primitive endoderm (GATA4-positive, red) and trophectoderm (CDX2-positive, green). The inactive X-chromosome (H3K27me3-positive, yellow dots) is reactivated only in the epiblast (cells without yellow spots), which will form the embryo. The germ cell factor PRDM14 and the long noncoding RNA Tsix collaborate during the X-reactivation process in blastocysts and pluripotent stem cells and thereby link epigenetic with cellular reprogramming events.
Image is courtesy of Bernhard Payer, runner-up of the immunofluorescence imaging competition 2017.
Chromatin was prepared from Hela cells according to the Abcam X-ChIP protocol. Cells were fixed with formaldehyde for 10min. The ChIP was performed with 25µg of chromatin, 5µg of ab6002 (blue), and 20µl of Protein A/G sepharose beads. No antibody was added to the beads control (yellow). The immunoprecipitated DNA was quantified by real time PCR (Taqman approach for active and inactive loci, Sybr green approach for heterochromatic loci). Primers and probes are located in the first kb of the transcribed region.
ChIP - Anti-Histone H3 (tri methyl K27) antibody [mAbcam 6002] - ChIP Grade (ab6002)This image is courtesy of Steve Bilodeau
Chromatin was prepared from nuclear lysate of the mouse embryonic stem cells. The cross-linking (X-ChiP) technique was used, crosslinking was performed for 15 minutes in 1% formaldehyde. The primary antibody was diluted to 0.0133µg/µg chromatin and incubated in ChIP Sonication Buffer with the sample for 24 hours at 4°C. The immunoprecipitated DNA was quantified by real time PCR.
Cdx2: PCR primers situated in the promoter regions of Caudal type homeobox transcription factor 2
Nef3: PCR primers situated in the promoter regions of neurofilament 3
All batches of ab6002 are tested in ELISA against peptides to different Histone H3 modifications. Results show strong binding to Histone H3 - tri methyl K27 immunising peptide (ab1782), indicating that this antibody specifically recognises the Histone H3 - tri methyl K27 modification. Weak binding is also detected against the Histone H3 - di methyl K27 modification (<12%) (ab1781).
This blot was produced using a 4-12% Bis-tris gel under the MES buffer system. The gel was run at 200V for 35 minutes before being transferred onto a Nitrocellulose membrane at 30V for 70 minutes. The membrane was then blocked for an hour using 3% milk before being incubated with ab6002 overnight at 4°C. Antibody binding was detected using an anti-mouse antibody conjugated to HRP, and visualised using ECL development solution ab133406.
Western blot - Anti-Histone H3 (tri methyl K27) antibody [mAbcam 6002] - ChIP Grade (ab6002)
Lane 1 : HeLa (Human epithelial carcinoma cell line) Nuclear Lysate Lane 2 : EED-/- mouse ES Whole Cell Lysate Lane 3 : WT mouse ES Whole Cell Lysate Lane 4 : HeLa (Human epithelial carcinoma cell line) Nuclear Lysate Lane 5 : EED-/- mouse ES Whole Cell Lysate Lane 6 : WT mouse ES Whole Cell Lysate
Lysates/proteins at 10 µg per lane.
Secondary Goat Anti-Mouse IgG H&L (HRP) preadsorbed (ab97040) at 1/50000 dilution Developed using the ECL technique
This blot was produced using a 4-12% Bis-tris gel under the MES buffer system. The gel was run at 200V for 35 minutes before being transferred onto a Nitrocellulose membrane at 30V for 70 minutes. The membrane was then blocked for an hour using 2% Bovine Serum Albumin (lanes 1-3) and 3% milk (lanes 4-6) before being incubated with ab6002 overnight at 4°C. Antibody binding was detected using an anti-mouse antibody conjugated to HRP, and visualised using ECL development solution ab133406.
ICC/IF image of ab6002 stained HeLa cells. The cells were 4% PFA fixed (10 min) and then incubated in 1%BSA / 10% normal goat serum / 0.3M glycine in 0.1% PBS-Tween for 1h to permeabilise the cells and block non-specific protein-protein interactions. The cells were then incubated with the antibody (ab6002, 5µg/ml) overnight at +4°C. The secondary antibody (green) was Alexa Fluor® 488 goat anti-mouse IgG (H+L) used at a 1/1000 dilution for 1h. Alexa Fluor® 594 WGA was used to label plasma membranes (red) at a 1/200 dilution for 1h. DAPI was used to stain the cell nuclei (blue) at a concentration of 1.43µM. This antibody also gave a positive result in 4% PFA fixed (10 min) Hek293, HepG2 and MCF7 cells at 5µg/ml, and in 100% methanol fixed (5 min) HeLa, Hek293, HepG2 and MCF7 cells at 5µg/ml.
Interphase 10T1/2 mouse fibroblasts were paraformaldehyde fixed (4%), immunofluorescently labeled with anti-trimethyl K27 antibody (ab6002) and counterstained with DAPI. The merge image presents the DAPI and ab6002 channels as red and green, respectively. The scale bar represents 3µm.
Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-Histone H3 (tri methyl K27) antibody [mAbcam 6002] - ChIP Grade (ab6002)This image is courtesy of an anonymous Abreview
Paraformaldehyde-fixed, paraffin-embedded human invasive breast carcinoma tissue stained for Histone H3 (tri methyl K27) using ab6002 at 1/200 dilution in immunohistochemical analysis.
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Ye Y et al. Chromatin remodeling during in vivo neural stem cells differentiating to neurons in early Drosophila embryos. Cell Death Differ24:409-420 (2017).
Read more (PubMed: 27858939) »