Glucose isomerase

Phosphoglucose isomerase is an enzyme that catalyzes the conversion of glucose-6-phosphate into fructose-6-phosphate in the second step of glycolysis. An unrelated enzyme, D-xylose isomerase catalyzes the isomerization of glucose to fructose, and is sometimes called "glucose isomerase".

Other functions
There is evidence that phosphoglucose isomerase acts as a molecular messenger. It is produced and secreted by white blood cells, and acts to regulate the growth of several different cell types.

Glucose isomérase 磷酸葡糖异构酶