3-hexulose-6-phosphate synthase

3-hexulose-6-phosphate synthase (,  D -arabino-3-hexulose 6-phosphate formaldehyde-lyase, 3-hexulosephosphate synthase, 3-hexulose phosphate synthase, HPS) is an enzyme with systematic name  D -arabino-hex-3-ulose-6-phosphate formaldehyde-lyase ( D -ribulose-5-phosphate-forming). This enzyme catalyses the following chemical reaction


 * D -arabino-hex-3-ulose 6-phosphate $$\rightleftharpoons$$ D -ribulose 5-phosphate + formaldehyde

This enzyme requires Mg2+ or Mn2+ for maximal activity.