| Type: | Conserved_site | Name: | Fructose-bisphosphate aldolase class-I active site |
| Description: | Fructose-bisphosphate aldolase () [, ] is a glycolytic enzyme that catalyses the reversible aldol cleavage or condensation of fructose-1,6-bisphosphate into dihydroxyacetone-phosphate and glyceraldehyde 3-phosphate. There are two classes of fructose-bisphosphate aldolases with different catalytic mechanisms: class I enzymes [] do not require a metal ion, and are characterised by the formation of a Schiff base intermediate between a highly conserved active site lysine and a substrate carbonyl group, while the class II enzymes require an active-site divalent metal ion. This entry represents the class I enzymes.In vertebrates, three forms of this enzyme are found: aldolase A is expressed in muscle, aldolase B in liver, kidney, stomach and intestine, and aldolase C in brain, heart and ovary. The different isozymes have different catalytic functions: aldolases A and C are mainly involved in glycolysis, while aldolase B is involved in both glycolysis and gluconeogenesis. Defects in aldolase A cause Glycogen storage disease 12 (GSD12) [], while defects in aldolase B result in hereditary fructose intolerance [].This conserved site represents the sequence around the lysine involved in the Schiff-base. | Short Name: | Aldolase_I_AS |
