This entry includes a group of putative nuclease, including hypothetical protein TT1808 (also known as Uma2 or TTHA1514), an AT-rich DNA-binding protein from Thermus thermophilus. This domain has a 3-layer alpha/beta/alpha topology similar to that found in restriction endonucleases [1]. The nuclease domain is ubiquitously found in enzymes involved in metabolism of nucleic acids, mostly in nucleases with diverse biological functions [2].

1: Crystal structure of TTHA1657 (AT-rich DNA-binding protein; p25) from Thermus thermophilus HB8 at 2.16 A resolution. Nakamura A, Sosa A, Komori H, Kita A, Miki K; Proteins. 2007;66:755-759. PMID:17154156

2: Identification of a new family of putative PD-(D/E)XK nucleases with unusual phylogenomic distribution and a new type of the active site. Feder M, Bujnicki JM; BMC Genomics. 2005;6:21-21. PMID:15720711