This entry represents a region that forms part of a larger HD domain [1,2].According to the original paper describing the HD domain this family represents cluster 1 [3].

1: Structure of O67745_AQUAE, a hypothetical protein from Aquifex aeolicus. Oganesyan V, Adams PD, Jancarik J, Kim R, Kim SH; Acta Crystallogr Sect F Struct Biol Cryst Commun. 2007;63:369-374. PMID:17565173

2: Characterization of the deoxynucleotide triphosphate triphosphohydrolase (dNTPase) activity of the EF1143 protein from Enterococcus faecalis and crystal structure of the activator-substrate complex. Vorontsov II, Minasov G, Kiryukhina O, Brunzelle JS, Shuvalova L, Anderson WF; J Biol Chem. 2011;286:33158-33166. PMID:21757692

3: The HD domain defines a new superfamily of metal-dependent phosphohydrolases. Aravind L, Koonin EV; Trends Biochem Sci 1998;23:469-472. PMID:9868367