DNA-activated serine/threonine protein kinase (DNA-PK) is a nuclear protein kinase that is involved in DNA nonhomologous end joining (NHEJ) required for double- strand brake repair and V(D)J recombination. DNA-PK is composed of a large catalytic subunit of ~470 kDa (DNA-PKcs) and a DNA binding heterodimer of approximately 70- and 80-kDa subunits called Ku. (1-2). Autophosphorylation of DNA-PK correlates with loss of protein kinase activity and dissociation of the DNA-PKcs-Ku complex. DNA-PK phosphorylates Hsp90, p53 and c-Jun (3-4).
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