Inositol-3-phosphate synthase

In enzymology, an inositol-3-phosphate synthase is an enzyme that catalyzes the chemical reaction


 * D-glucose 6-phosphate $$\rightleftharpoons$$ 1D-myo-inositol 3-phosphate

Hence, this enzyme has one substrate, D-glucose 6-phosphate, and one product, 1D-myo-inositol 3-phosphate.

This enzyme belongs to the family of isomerases, specifically the class of intramolecular lyases. The systematic name of this enzyme class is 1D-myo-inositol-3-phosphate lyase (isomerizing). Other names in common use include myo-inositol-1-phosphate synthase, D-glucose 6-phosphate cycloaldolase, inositol 1-phosphate synthatase, glucose 6-phosphate cyclase, inositol 1-phosphate synthetase, glucose-6-phosphate inositol monophosphate cycloaldolase, glucocycloaldolase, and 1L-myo-inositol-1-phosphate lyase (isomerizing). This enzyme participates in streptomycin biosynthesis and inositol phosphate metabolism. It employs one cofactor, NAD+.

Structural studies
As of late 2007, 12 structures have been solved for this class of enzymes, with PDB accession codes, , , , , , , , , , , and.