This is the Sucrose-6-phosphate phosphohydrolase (S6PP or SPP) C-terminal domain [1] as found in in plant sucrose phosphatases. These enzymes irreversibly catalyse the last step in sucrose synthesis following the formation of Sucrose-6-Phosphate via sucrose-phosphate synthase (SPS).

1: Purification, molecular cloning, and sequence analysis of sucrose-6F-phosphate phosphohydrolase from plants. Lunn JE, Ashton AR, Hatch MD, Heldt HW; Proc Natl Acad Sci U S A 2000;97:12914-12919. PMID:11050182