| Description | The haloacid dehydrogenase (HAD) superfamily includes phosphatases, phosphonatases, P-type ATPases, beta-phosphoglucomutases, phosphomannomutases, and dehalogenases, which are involved in a variety of cellular processes ranging from amino acid biosynthesis to detoxification [ ].Crystal structures of proteins from the HAD superfamily show that these proteins all share a conserved α/β-domain classified as a hydrolase fold, which is similar to the Rossmann fold [ ]. This conserved domain usually contains an insertion (sub)domain. For example, the crystal structure of a phosphoglycolate phosphatase from Thermoplasma acidophilum [] revealed two distinct domains, a larger core domain and a smaller cap domain. The large domain is composed of a centrally located five-stranded parallel β-sheet with strand order S10, S9, S8, S1, S2 and a small β-hairpin, strands S3 and S4. This central sheet is flanked by a set of three α-helices on one side and two helices on the other. The topology of the large domain is conserved; however, structural variation is observed in the smaller domain among the different functional classes of the haloacid dehalogenase superfamily. | Name | HAD superfamily |
| Short Name | HAD_sf | Type | Homologous_superfamily |
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