This small group of proteins is a member of the IIB subfamily of the haloacid dehalogenase (HAD) superfamily of aspartate-nucleophile hydrolases (IPR005834). Nothing is known about the function of this group of proteins, however given that the other known enzymes of the IIB subfamily are sugar phosphatases or mutases, it would not be unreasonable to predict that these also acts on sugars.
Empadinhas N, Albuquerque L, Henne A, Santos H, da Costa MS.
The bacterium Thermus thermophilus, like hyperthermophilic archaea, uses a two-step pathway for the synthesis of mannosylglycerate.
Appl. Environ. Microbiol. 69 2003 3272-9
[PubMed: 12788726] http://dx.doi.org/10.1128/AEM.69.6.3272-3279.2003