Technical Data
Heterochromatin Protein 1, gamma (HP1g, M32)
Chromatin assembly factor-1 (CAF-1) is a multisubunit protein complex that comprises three polypeptide subunits known as p150, p60, and p48. CAF-1 is a nucleosome assembly factor that deposits newly synthesized and acetylated histones H3/H4 into nascent chromatin during DNA replication. The p150 subunit of CAF-1 also supports the maintenance of heterochromatin, which requires the synthesis of both new histones and heterochromatin proteins and their orderly assembly during DNA replication. Heterochromatin is characterized as densely coiled chromatin that generally replicates late during S phase, has a low gene density, and contains large blocks of repetitive DNA that is relatively inaccessible to DNA-modifying reagents. In late S phase, p150 directly associates with heterochromatin associated proteins 1 (HP1alpha, HP1beta and HP1gamma). As cells prepare for mitosis, CAF-1 p150 and some HP1 progressively dissociate from heterochromatin, coinciding with the phosphorylation of histone H3. The HP1 proteins reassociate with chromatin at the end of mitosis, as histone H3 is dephosphorylated.

Suitable for use in Western Blot, Immunohistochemistry and Chromatin Immunoprecipitation. Other applications not tested.

Recommended Dilutions:
Western Blot: 0.01-0.1ug/ml detects HP1g protein in acid-extracted HeLa cell lysates.
Immunohistochemistry: Reported to detect HP1g positive cells in breast tissue.
Immunoprecipitation (Chromatin): Reported to immunoprecipitate HP1g from nuclear extracts and formalin-cross-linked chromatin.
Optimal dilutions to be determined by the researcher.

Positive Control:
HeLa acid extracts, HEK 293 nuclear extracts.

Storage and Stability:
May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
MabIgG15H14Affinity Purified
200ug-20CBlue IceHumanMouse
Fusion protein corresponding to aa17-173 of human Heterochromatin Protein 1 gamma with GST.
Purified by Protein G affinity chromatography.
Supplied as a liquid in 0.1M Tris-glycine, pH 7.4, 0.15M sodium chloride, 0.05% sodium azide, 30% glycerol.
Recognizes human HP1g protein, MW ~25kD. Species Crossreactivity: mouse.
Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.
1. Zhao, T., et al. (2001). J. Biol. Chem. 276: 9512-9518. 2. Eissenberg, J.C., et al. (2000). Curr. Opin. Genet. Dev. 10: 204-210.