Fructose bisphosphatase (EC 3.1.3.11) is an enzyme that converts fructose-1,6-bisphosphate to fructose 6-phosphate in gluconeogenesis and the Calvin cycle which are both anabolic pathways.Fructose bisphosphatase catalyses the reverse of the reaction which is catalysed by phosphofructokinase in glycolysis.one of these groups have been found in archaea so far, though a new group of FBPases (FBPase IV) which also show inositol monophosphatase activity has recently been identified in archaea. A new group of FBPases (FBPase V) is found in thermophilic archaea and the hyperthermophilic bacterium Aquifex aeolicus.