Anti-Human, Mouse, Rat Histone H2A.x - IMG-6593A

Background
H2A.x is a human histone H2A isoprotein containing 143 amino acid residues. H2A.x is considered a basal histone, being synthesized in G1 as well as in S-phase, and its mRNA contains polyA addition motifs and a polyA tail along with the conserved stem-loop and U7 binding sequences involved in the processing and stability of replication type histone mRNAs. There are two forms of H2A.x mRNA, one about 1600 bases long and contains polyA; the other about 575 bases long, lacking polyA. The short form behaves as a replication type histone mRNA, while the longer behaves as a basal type histone mRNA. H2A.x becomes extensively phosphorylated within 1-3 minutes of DNA damage and forms foci at break sites. It is required for checkpoint-mediated arrest of cell cycle progression in response to low doses of ionizing radiation and for efficient repair of DNA double strand breaks (DSBs) specifically when modified by C-terminal phosphorylation. It maps to the 11q23.2-q23.3 region of the human chromosome. Histone H2A.x contributes to histone-formation and therefore the structure of DNA. Histone H2A variant H2A.x specifically regulates the interaction of MDC1 (mediator of DNA damage checkpoint protein 1), a DNA repair protein to the sites of DNA damage.

Antigen
A portion of amino acids 50-100 of human Histone H2A.x was used as the immunogen.

Application Notes
The amino acid sequence used as immunogen is 100% homologous in human, mouse and rat.

Genebank Info (Protein)
P16104