Chromatin was prepared from U2OS cells according to the Abcam X-ChIP protocol. Cells were fixed with formaldehyde for 10min. The  ChIP was performed with 25 µg of chromatin, 5 µg of  ab1012 (blue), and 20 µl 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). Primers and probes are located in the first kb of the transcribed region.

SK-N-SK cells were fixed in 4% paraformaldehdye, permeabilized in 0.5% Triton X-100 and incubated with ab1012 (1/100). The antibody clearly stains the nucleus (red). The cells were counterstained with DAPI (blue). 100x magnification.

ELISA using ab1012 at varying antibody concentrations.

Curve_SPL1 indicates binding to the Human Histone H3 (tri methyl K4) peptide (ab1342). Curve_SPL4 indicates partial binding to the Human Histone H3 (di methyl K4) peptide (ab7768). There is very weak cross-reactivity with the Human Histone H3 (mono methyl K4) peptide (ab1340) (Curve_SPL3).

Binding to the following peptides was not seen: SPL2 unmodified Histone H3, SPL5 Histone H3 mono methyl K9, SPL6 Histone H3 di methyl K9, SPL7 Histone H3 tri methyl K9, SPL8 Histone H3 mono methyl K27, SPL9 Histone H3 di methyl K27, SPL10 Histone H3 tri methyl K27.

All batches of ab1012 are tested in Peptide Array against peptides to different Histone modifications. Six dilutions of each peptide are printed on to the Peptide Array in triplicate and results are averaged before being plotted on to a graph. Results show strong binding to Histone H3 - tri methyl K4 peptide (ab92374), indicating that this antibody specifically recognises the Histone H3 - tri methyl K4 modification.

ab92374 - Histone H3 - tri methyl K4

ab7768 - Histone H3 - di methyl K4

ab179150 - Histone H3 - asymmetric di methyl R2

ab179142 - Histone H3 - mono methyl R2

ab1784 - Histone H3 - di methyl K36

ab179146 - Histone H3 - symmetric di methyl R2

ab36927 - Histone H2A - phospho S122

ab46854 - Histone H3 - tri methyl K18

ab179021 - Histone H2A - symmetric di methyl R29

ab17632 - Histone H4 - biotinylated K5

ab179159 - Histone H3 - phospho T3

ab14103 - Histone H3 - phopsho T6

ab1783 - Histone H3 - mono methyl K36

ab179177 - Histone H3 - mono methyl K4 + Histone H3 di methyl K9

Lane 1 : Anti-Histone H3 (tri methyl K4) antibody [mAbcam1012] - ChIP Grade (ab1012) at 1 µg/ml (Blocked in 5% BSA)
Lane 2 : Anti-Histone H3 (tri methyl K4) antibody [mAbcam1012] - ChIP Grade (ab1012) at 1 µg/ml (Blocked in 5% MILK)

All lanes : Calf Thymus Histone Preparation Nuclear Lysate

Lysates/proteins at 0.5 µg per lane.

Secondary
All lanes : Goat polyclonal to Mouse IgG - H&L - Pre-Adsorbed (HRP) at 1/3000 dilution

Performed under reducing conditions.

Predicted band size: 15 kDa
Observed band size: 17 kDa why is the actual band size different from the predicted?


Exposure time: 10 minutes

ICC/IF image of ab1012 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 (ab1012, 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) HepG2, Hek293 and MCF7 cells at 5µg/ml, and in 100% methanol fixed (5 min) HeLa, Hek293, HepG2 and MCF7 cells at 5µg/ml.

Overlay histogram showing HeLa cells stained with ab1012 (red line). The cells were fixed with 80% methanol (5 min) and then permeabilized with 0.1% PBS-Triton X-100 for 15 min. The cells were then incubated in 1x PBS / 10% normal goat serum to block non-specific protein-protein interactions followed by the antibody (ab1012, 1µg/1x10⁶) for 30 min at 22°C.  The secondary antibody used was Goat Anti-Mouse IgG H&L (Alexa Fluor® 488) preadsorbed (ab150117) at 1/2000 dilution for 30 min at 22°C.

Isotype control antibody (black line) was Mouse IgG2b [7E10G10] isotype control (ab170192) used at the same concentration and conditions as the primary antibody. Unlabelled sample (blue line) was also used as a control.

Acquisition of >5,000 events were collected using a 50 mW Blue laser (488nm) and 530/30 bandpass filter.

This antibody gave a positive signal in HeLa cells fixed with 4% formaldehyde (10 min)/permeabilized with 0.1% PBS-Triton X-100 for 15 min used under the same conditions.