This is the zinc ribbon fold of the PADR1 domain found in poly(ADP-ribose)-polymerases, referred to as the third zinc-binding domain of these proteins [1-5]. The PADR1 domain is involved in protein-protein interactions that orchestrate PARP-1 activation and are critical to the DNA-dependent stimulation of PARP-1. PADR1 consists of an N-terminal helical region, the central zinc ribbon fold and a C-terminal tail.

1: Insights into the evolution of the nucleolus by an analysis of its protein domain repertoire. Staub E, Fiziev P, Rosenthal A, Hinzmann B; Bioessays 2004;26:567-581. PMID:15112237

2: A third zinc-binding domain of human poly(ADP-ribose) polymerase-1 coordinates DNA-dependent enzyme activation. Langelier MF, Servent KM, Rogers EE, Pascal JM; J Biol Chem. 2008;283:4105-4114. PMID:18055453

3: Structural basis for DNA damage-dependent poly(ADP-ribosyl)ation by human PARP-1. Langelier MF, Planck JL, Roy S, Pascal JM; Science. 2012;336:728-732. PMID:22582261

4: Domain C of human poly(ADP-ribose) polymerase-1 is important for enzyme activity and contains a novel zinc-ribbon motif. Tao Z, Gao P, Hoffman DW, Liu HW; Biochemistry. 2008;47:5804-5813. PMID:18452307

5: Crystal structures of poly(ADP-ribose) polymerase-1 (PARP-1) zinc fingers bound to DNA: structural and functional insights into DNA-dependent PARP-1 activity. Langelier MF, Planck JL, Roy S, Pascal JM; J Biol Chem. 2011;286:10690-10701. PMID:21233213

6: Poly(ADP-Ribose) Polymerases in Plants and Their Human Counterparts: Parallels\tand Peculiarities. Rissel D, Peiter E; Int J Mol Sci. 2019;20:1638. PMID:30986964