Poly ADP Ribose Polymerase (PARP)

Poly (ADP-ribose) polymerase is a protein involved in a number of cellular processes involving mainly DNA repair and programmed cell death.RP, a 116 kDa nuclear poly (ADP-ribose) polymerase, appears to be involved in DNA repair in response to environmental stress . This protein can be cleaved by many ICE-like caspases in vitro and is one of the main cleavage targets of caspase-3 in vivo . In human PARP, the cleavage occurs between Asp214 and Gly215, which separates the PARP amino-terminal DNA binding domain (24 kDa) from the carboxy-terminal catalytic domain (89 kDa) .
PARP1 is a chromatin-associated enzyme, poly-ADP ribose polymerase-1, which modifies various nuclear proteins by poly(ADP-ribosyl)ation. PARP1 has a role in repair of single-stranded DNA (ssDNA) breaks.