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Glucose-6-phosphate isomerase (GPI), alternatively known as phosphoglucose isomerase/phosphoglucoisomerase (PGI) or phosphohexose isomerase (PHI), is an enzyme ( EC 5.3.1.9) that in humans is encoded by the GPI gene on chromosome 19. [4] This gene encodes a member of the glucose phosphate isomerase protein family.
In enzymology, a glucuronate isomerase (EC 5.3.1.12) is an enzyme that catalyzes the chemical reaction D-glucuronate ⇌ {\displaystyle \rightleftharpoons } D-fructuronate Hence, this enzyme has one substrate , D-glucuronate , and one product , D-fructuronate .
The isomerase has now been observed in nearly a hundred species of bacteria. [2] Xylose-isomerases are also commonly called glucose isomerase or fructose isomerases due to their ability to interconvert glucose and fructose. The systematic name of this enzyme class is α-D-xylopyranose aldose-ketose-isomerase. Other names in common use include D ...
Glucose isomerase (also known as xylose isomerase) catalyzes the conversion of D-xylose and D-glucose to D-xylulose and D-fructose. Like most sugar isomerases, glucose isomerase catalyzes the interconversion of aldoses and ketoses. [24] The conversion of glucose to fructose is a key component of high-fructose corn syrup production.
Hyperglycemic clamp technique: The plasma glucose concentration is acutely raised to 125 mg/dl above basal levels by a continuous infusion of glucose. This hyperglycemic plateau is maintained by adjustment of a variable glucose infusion, based on the rate of insulin secretion and glucose metabolism. Because the plasma glucose concentration is ...
Glucose 6-phosphatase-β is a ubiquitously expressed, 346-amino acid membrane protein that shares 36% sequence identity with glucose 6-phosphatase-α. Within the glucose 6-phosphatase-β enzyme, sequence alignments predict that its active site contains His167, His114, and Arg79.
Hence, this enzyme has one substrate, alpha-D-glucose 6-phosphate, and one product, beta-D-glucose 6-phosphate. This enzyme belongs to the family of isomerases, specifically those racemases and epimerases acting on carbohydrates and derivatives. The systematic name of this enzyme class is D-glucose-6-phosphate 1-epimerase.
In enzymology, a D-lyxose ketol-isomerase (EC 5.3.1.15) is an enzyme that catalyzes the chemical reaction D-lyxose ⇌ {\displaystyle \rightleftharpoons } D-xylulose Hence, this enzyme has one substrate , D-lyxose , and one product , D-xylulose .
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