Cell Signaling Technology

Product Pathways - Chromatin Regulation / Epigenetics

Di-Methyl-Histone H3 (Lys27) Antibody #9755

Applications Reactivity Sensitivity MW (kDa) Source
W IP H M R Mk Endogenous 17 Rabbit

Applications Key:  W=Western Blotting  IP=Immunoprecipitation
Reactivity Key:  H=Human  M=Mouse  R=Rat  Mk=Monkey
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Protocols

Specificity / Sensitivity

Di-Methyl-Histone H3 (Lys27) Antibody detects endogenous levels of histone H3 only when di-methylated on Lys27. The antibody does not cross-react with non-methylated, mono-methylated or tri-methylated Lys27. In addition, the antibody does not cross-react with di-methylated or tri-methylated histone H3 Lys9.

Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to the amino terminus of histone H3 in which lysine 27 is di-methylated. Antibodies are purified by protein A and peptide affinity chromatography.

Western Blotting

Western Blotting

Western blot analysis of whole cell lysates from HeLa, NIH/3T3, H-4-II-E and COS cells, using Di-Methyl-Histone H3 (Lys27) Antibody.

ELISA-Peptide

ELISA-Peptide

Di-Methyl-Histone H3 (Lys27) Antibody specificity was determined by peptide ELISA. The graph depicts the binding of the antibody to pre-coated di-methyl histone H3 (Lys27) peptide in the presence of increasing concentrations of various competitor peptides. As shown, only the di-methyl histone H3 (Lys27) peptide competed away binding of the antibody.

Background

The nucleosome, made up of four core histone proteins (H2A, H2B, H3, and H4), is the primary building block of chromatin. Originally thought to function as a static scaffold for DNA packaging, histones have now been shown to be dynamic proteins, undergoing multiple types of post-translational modifications, including acetylation, phosphorylation, methylation, and ubiquitination (1). Histone methylation is a major determinant for the formation of active and inactive regions of the genome and is crucial for the proper programming of the genome during development (2,3). Arginine methylation of histones H3 (Arg2, 17, 26) and H4 (Arg3) promotes transcriptional activation and is mediated by a family of protein arginine methyltransferases (PRMTs), including the co-activators PRMT1 and CARM1 (PRMT4) (4). In contrast, a more diverse set of histone lysine methyltransferases has been identified, all but one of which contain a conserved catalytic SET domain originally identified in the Drosophila Su(var)3-9, Enhancer of zeste, and Trithorax proteins. Lysine methylation occurs primarily on histones H3 (Lys4, 9, 27, 36, 79) and H4 (Lys20) and has been implicated in both transcriptional activation and silencing (4). Methylation of these lysine residues coordinates the recruitment of chromatin modifying enzymes containing methyl-lysine binding modules such as chromodomains (HP1, PRC1), PHD fingers (BPTF, ING2), tudor domains (53BP1), and WD-40 domains (WDR5) (5-8). The discovery of histone demethylases such as PADI4, LSD1, JMJD1, JMJD2, and JHDM1 has shown that methylation is a reversible epigenetic marker (9).

  1. Peterson, C.L. and Laniel, M.A. (2004) Curr. Biol. 14, R546-R551.
  2. Kubicek, S. et al. (2006) Ernst Schering Res. Found Workshop, 1-27.
  3. Lin, W. and Dent, S.Y. (2006) Curr. Opin. Genet. Dev. 16, 137-142.
  4. Lee, D.Y. et al. (2005) Endocr. Rev. 26, 147-170.
  5. Daniel, J.A. et al. (2005) Cell Cycle 4, 919-926.
  6. Shi, X. et al. (2006) Nature 442, 96-99.
  7. Wysocka, J. et al. (2006) Nature 442, 86-90.
  8. Wysocka, J. et al. (2005) Cell 121, 859-872.
  9. Trojer, P. and Reinberg, D. (2006) Cell 125, 213-217.

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