NTR (N-terminal region) domain of poly [ADP-ribose] polymerase 2 (PARP-2) and similar proteins
PARP-2 is also called ADP-ribosyltransferase diphtheria toxin-like 2 (ARTD2), DNA ADP-ribosyltransferase PARP2, NAD(+) ADP-ribosyltransferase 2 (ADPRT-2), poly[ADP-ribose] synthase 2 (pADPRT-2), or protein poly-ADP-ribosyltransferase PARP2. It is a poly-ADP-ribosyltransferase that mediates poly-ADP-ribosylation of proteins and plays a key role in DNA repair. It mainly mediates glutamate and aspartate ADP-ribosylation of target proteins. PARP-2 can also ADP-ribosylate DNA; it preferentially acts on 5'-terminal phosphates at DNA strand break termini in nicked duplex. This model corresponds to the NTR (N-terminal region) domain of PARP-2, which contains a nucleolar localization sequence (NoLS) and a putative nuclear localization signal (NLS). The NTR domain has a helical SAF-A/B, Acinus, and PIAS (SAP) domain fold and may participate in protein-protein interactions.