<p>This family of sequences represent sucrose phosphate phosphohydrolase (SPP) from plants and cyanobacteria [<cite idref="PUB00010220"/>]. SPP is a member of the Class IIB subfamily of the haloacid dehalogenase (HAD) superfamily of aspartate-nucleophile hydrolases. SPP catalyzes the final step in the biosynthesis of sucrose, a critically important molecule for plants. Sucrose phosphate synthase (SPS), the prior step in the biosynthesis of sucrose contains a domain which exhibits considerable similarity to SPP albeit without conservation of the catalytic residues. The catalytic machinery of the synthase resides in another domain. It seems likely that the phosphatase-like domain is involved in substrate binding, possibly binding both substrates in a "product-like" orientation prior to ligation by the synthase catalytic domain.</p>