A member of the deaminase fold that binds an unknown ligand in the crystal structure. The protein is ADP-ribosylated at a conserved aspartate [1]. Contextual analysis suggests that the domain is likely to bind NAD or ADP ribose either to sense redox states or to function as a regulatory ADP ribosyltransferase [2].

1: Crystal structure of an ADP-ribosylated protein with a cytidine deaminase-like fold, but unknown function (TM1506), from Thermotoga maritima at 2.70 A resolution. Xu Q, Kozbial P, McMullan D, Krishna SS, Brittain SM, Ficarro SB, DiDonato M, Miller MD, Abdubek P, Axelrod HL, Chiu HJ, Clayton T, Duan L, Elsliger MA, Feuerhelm J, Grzechnik SK, Hale J, Han GW, Jaroszewski L, Klock HE, Morse AT, Nigoghossian E, Paulsen J, Reyes R, Rife CL, van den Bedem H, White A, Hodgson KO, Wooley J, Deacon AM, Godzik A, Lesley SA, Wilson IA; Proteins. 2008;71:1546-1552. PMID:18275082

2: Evolution of the deaminase fold and multiple origins of eukaryotic editing and mutagenic nucleic acid deaminases from bacterial toxin systems. Iyer LM, Zhang D, Rogozin IB, Aravind L; Nucleic Acids Res. 2011; [Epub ahead of print] PMID:21890906