This is a eukaryotic/eumetazoan PIN like domain found in the C-terminal region of bilateral ZNF451 proteins such as isoform 1 of human ZNF451. ZNF451 was shown to interact with p300 by the PIN-like domain and to negatively regulate TGF-beta signalling in a p300-dependent and sumoylation-independent manner. This domain is suggested to posses a potential active nuclease due to the presence of at least four conserved Asp residues in the predicted active site. Furthermore, it contains several conserved Cys and His residues, which may suggest stabilization of the domain structure with an embedded short zinc-binding loop [1].

1: Comprehensive classification of the PIN domain-like superfamily. Matelska D, Steczkiewicz K, Ginalski K; Nucleic Acids Res. 2017;45:6995-7020. PMID:28575517