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Immunohistochemical analysis of paraffin-embedded human breast carcinoma using HP1α (C7F11) Rabbit mAb #2623 in the presence of control peptide (left) or HP1α Blocking Peptide (right).

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Product Description

This peptide is used to block HP1α Antibody #2616 and HP1α (C7F11) Rabbit mAb #2623 reactivity in immunohistochemistry protocols.


Quality Control

The quality of the peptide was evaluated by reversed-phase HPLC and by mass spectrometry. The peptide blocks HP1α Antibody #2616 and HP1α (C7F11) Rabbit mAb #2623 by immunohistochemistry.

Product Usage Information

For immunohistochemistry, add twice the volume of peptide as volume of antibody used in 100 µl total volume. Incubate for a minimum of 30 minutes prior to adding the entire volume to the slide. Recommended antibody dilutions can be found on the relevant product data sheet.


Storage: Supplied in 20 mM potassium phosphate (pH 7.0), 50 mM NaCl, 0.1 mM EDTA, 1 mg/ml BSA and 5% glycerol. Store at –20°C.

Heterochromatin protein 1 (HP1) is a family of heterochromatic adaptor molecules involved in both gene silencing and higher order chromatin structure (1). All three HP1 family members (α, β, and γ) are primarily associated with centromeric heterochromatin; however, HP1β and γ also localize to euchromatic sites in the genome (2,3). HP1 proteins are approximately 25 kDa in size and contain a conserved amino-terminal chromodomain, followed by a variable hinge region and a conserved carboxy-terminal chromoshadow domain. The chromodomain facilitates binding to histone H3 tri-methylated at Lys9, a histone "mark" closely associated with centromeric heterochromatin (4,5). The variable hinge region binds both RNA and DNA in a sequence-independent manner (6). The chromoshadow domain mediates the dimerization of HP1 proteins, in addition to binding multiple proteins implicated in gene silencing and heterochromatin formation, including the SUV39H histone methyltransferase, the DNMT1 and DNMT3a DNA methyltransferases, and the p150 subunit of chromatin-assembly factor-1 (CAF1) (7-9). In addition to contributing to heterochromatin formation and propagation, HP1 and SUV39H are also found complexed with retinoblastoma (Rb) and E2F6 proteins, both of which function to repress euchromatic gene transcription in quiescent cells (10,11). HP1 proteins are subject to multiple types of post-translational modifications, including phosphorylation, acetylation, methylation, ubiquitination, and sumoylation, suggesting multiple means of regulation (12-14).


1.  Maison, C. and Almouzni, G. (2004) Nat. Rev. Mol. Cell Biol. 5, 296-304.

2.  Minc, E. et al. (2000) Cytogenet. Cell Genet. 90, 279-284.

3.  Nielsen, A.L. et al. (2001) Mol. Cell 7, 729-739.

4.  Lachner, M. et al. (2001) Nature 410, 116-120.

5.  Bannister, A. J. et al. (2001) Nature 410, 120-123.

6.  Muchardt, C. et al. (2002) EMBO Rep. 3, 975-981.

7.  Yamamoto, K. and Sonoda, M. (2003) Biochem. Biophys. Res. Commun. 301, 287-292.

8.  Fuks, F. et al. (2003) Nucleic Acids Res. 31, 2305-2312.

9.  Murzina, N. et al. (1999) Mol. Cell 4, 529-540.

10.  Nielsen, S.J. et al. (2001) Nature 412, 561-565.

11.  Ogawa, H. et al. (2002) Science 296, 1132-1136.

12.  Minc, E. et al. (1999) Chromosoma 108, 220-234.

13.  Zhao, T. et al. (2001) J. Biol. Chem. 276, 9512-9518.

14.  Lomberk, G. et al. (2006) Nat. Cell Biol. 8, 407-415.


Entrez-Gene Id 23468
Swiss-Prot Acc. P45973


For Research Use Only. Not For Use In Diagnostic Procedures.
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