Phosphoglucose isomerase
Phosphoglucose isomerase is an enzyme that catalyses the reversible isomerization of glucose-6-phosphate and fructose-6-phosphate . In many complex organisms it is involved in glycolysis. In mammals it is involved in gluconeogenesis and carbohydrate biosynthesis in plants. [1]
http://biology.kenyon.edu/BMB/Chime2/2001/phosphoglucose%20isomerase/FRAMES/text.htm