FUNCTION: SwissProt: P09874 # Involved in the base excision repair (BER) pathway, by catalyzing the poly(ADP-ribosyl)ation of a limited number of acceptor proteins involved in chromatin architecture and in DNA metabolism. This modification follows DNA damages and appears as an obligatory step in a detection/signaling pathway leading to the reparation of DNA strand breaks.
SIZE: 1014 amino acids; 113084 Da
SUBUNIT: Component of a base excision repair (BER) complex, containing at least XRCC1, PARP2, POLB and LIG3. Homo- and heterodimer with PARP2. Interacts with PARP3, APTX and SRY. The SWAP complex consists of NPM1, NCL, PARP1 and SWAP70. Interacts with ZNF423 (By similarity).
SUBCELLULAR LOCATION: Nucleus.
PTM: Phosphorylated by PRKDC. Phosphorylated upon DNA damage, probably by ATM or ATR. & Poly-ADP-ribosylated by PARP2.
SIMILARITY: SwissProt: P09874 ## Contains 1 BRCT domain. & Contains 1 PARP alpha-helical domain. & Contains 1 PARP catalytic domain. & Contains 2 PARP-type zinc fingers.
MISCELLANEOUS: The ADP-D-ribosyl group of NAD(+) is transferred to an acceptor carboxyl group on a histone or the enzyme itself, and further ADP-ribosyl groups are transferred to the 2'-position of the terminal adenosine moiety, building up a polymer with an average chain length of 20-30 units.