XRCC6 (Acetyl-K338) polyclonal antibody

The Ku protein islocalized in the nucleus and iscomposed of subunits referred to as Ku-70 (or p70) and Ku-86 or (p86). Ku wasfirst described as an autoantigen to which antibodies were produced in a patient with scleroderma polymyositis overlap syndrome, and waslater found in the sera of patients with other rheumatic diseases. Both subunits of the Ku protein have been cloned, and a number of functions have been proposed for Ku, including cellsignaling, DNA replication and transcriptional activation. Ku is involved in Pol II-directed transcription byvirtue of its DNA binding activity,serving as the regulatory component of the DNA-associated protein kinase that phosphorylates Pol II and transcription factor Sp. Ku proteins also activate transcription from the U1 small nuclear RNA and the human transferrin receptor gene promoters. A Ku-related protein designated the enhancer binding factor (E1BF),composed of two subunits, has been identified as a positive regulator of RNA polymerase I transcription initiation.