Abcam's Phosphoglucose Isomerase Activity Assay Kit (Colorimetric) (ab155897) is an assay where PGI
(phosphoglucose isomerase) converts fructose-6-phosphate to glucose-6-phosphate; the glucose-6-phosphate is
oxidized by glucose-6-phosphate dehydrogenase to form a product, which reacts with a colorless probe to give
strong absorbance at 450 nm. The PGI assay is simple, sensitive and rapid and can detect phosphoglucose isomerase
activity less than 0.1 mU/reaction.This product is manufactured by BioVision, an Abcam company and was previously
called K775 Phosphoglucose Isomerase Activity Colorimetric Assay Kit. K775-100 is the same size as the 100 test size
of ab155897.
Phosphoglucose isomerase (glucose-6-phosphate isomerase or PGI, EC 5.3.1.9) is an important housekeeping
enzyme. PGI catalyzes the interconversion of glucose-6- phosphate to fructose-6-phosphate. PGI performs multiple
functions & intracellularly plays key role in both glycolysis and gluconeogenesis. Extracellularly, PGI [also called
Autocrine Motility Factor (AMF)] functions as a cytokine, which stimulates cell motility and is associated with tumor
development and metastasis. In humans, PGI deficiency causes hemolytic anemia, whereas increased PGI activity is
observed in many cancers such as gastrointestinal, kidney and breast cancer. Early detection of abnormal
phosphoglucose isomerase activity is crucial for diagnosis, prediction and therapeutic strategy.