This is the catalytic C-terminal domain of trehalose-6-phosphate phosphatase from parasitic nematodes such as Brugia malayi. This domain adopts a C2B-type HAD phosphatase fold [1]. In C. elegans, T6PP is essential for survival due to the toxic effect(s) of the accumulation of trehalose 6-phosphate.

1: Structure of the trehalose-6-phosphate phosphatase from Brugia malayi reveals key design principles for anthelmintic drugs. Farelli JD, Galvin BD, Li Z, Liu C, Aono M, Garland M, Hallett OE, Causey TB, Ali-Reynolds A, Saltzberg DJ, Carlow CK, Dunaway-Mariano D, Allen KN; PLoS Pathog. 2014;10:e1004245. PMID:24992307