Anti-Histone H1o/H5 Antibody, clone 3H9

Histone H1/H5 (UniProt: P02259) are linker histones that are involved in the organization and maintenance of chromatin higher order structure and they play an active role in the control of DNA replication and cell proliferation. Linker histones are essential for chromatin filament formation, and they play key roles in the regulation of gene expression. Histone H1o is a histone H5-like protein found in mammalian species. It is present in the linker region of chromatin and replaces H1 there. Up to one third of the H1 can be replaced in some tissues. Histone H5 performs the same function as H1, being necessary for the condensation of nucleosome chains into higher order structures, and replaces histone H1 in certain cells. Histone H5 is found in erythroid cells in avian species. Histone H5 consists of a central globular domain (GH5) that is essential for nucleosome binding and is flanked by basic N- and C-terminal tails. It is reported that binding of either histone H5 or GH5 to nucleosomes protects an additional 20 bp of linker DNA from micrococcal nuclease digestion. Globular domain of linker histone H5 (GH5) contains three distinct DNA-binding sites, through which GH5 contacts the DNA at the nucleosome dyad and the linker DNA strands entering and exiting the nucleosome. (Ref.: Segers, A et al (1991). J. Biol. Chem. 266(3); 1502-1508; Fan, L., and Roberts, VA (2006). Proc. Natl. Acad. Sci. USA. 113 (22); 8384 8389; Smith, BH and Jones, EW (1980). Nucleic Acids Res. 8(24); 6069-6079).