This enzyme occurs as a bifunctional enzyme with fructose-2,6-bisphosphatase. The bifunctional enzyme catalyses both the synthesis and degradation of fructose-2,6-bisphosphate, a potent regulator of glycolysis [1]. This enzyme contains a P-loop motif.

1: The crystal structure of the bifunctional enzyme 6-phosphofructo-2- kinase/fructose-2,6-bisphosphatase reveals distinct domain homologies. Hasemann CA, Istvan ES, Uyeda K, Deisenhofer J; Structure 1996;4:1017-1029. PMID:8805587