This domain is found in 2',5'-phosphodiesterase 12 from humans (PDE12) and similar animal proteins. Pde12 cleaves 2',5'- phosphodiester bond linking adenosines of oligoadenylates. It plays a role as a negative regulator of the 2-5A system that is one of the major pathways for antiviral and antitumour functions induced by interferons (IFNs). PDE12 is organised into two clear domains: an N-terminal domain (this entry) and a C-terminal domain (Pfam:PF03372). This domain is primarily composed of extended loop regions around a core composed of a six beta-strand meander that forms a two-layer beta-sandwich, showing an immunoglobulin-like fold [1-2].

1: The Role of Phosphodiesterase 12 (PDE12) as a Negative Regulator of the Innate Immune Response and the Discovery of Antiviral Inhibitors. Wood ER, Bledsoe R, Chai J, Daka P, Deng H, Ding Y, Harris-Gurley S, Kryn LH, Nartey E, Nichols J, Nolte RT, Prabhu N, Rise C, Sheahan T, Shotwell JB, Smith D, Tai V, Taylor JD, Tomberlin G, Wang L, Wisely B, You S, Xia B, Dickson H; J Biol Chem. 2015;290:19681-19696. PMID:26055709

2: PDE12 removes mitochondrial RNA poly(A) tails and controls translation in human mitochondria. Rorbach J, Nicholls TJ, Minczuk M; Nucleic Acids Res. 2011;39:7750-7763. PMID:21666256