What is phosphogluconate pathway?
What is phosphogluconate pathway?
The pentose phosphate pathway (also called the phosphogluconate pathway and the hexose monophosphate shunt and the HMP Shunt) is a metabolic pathway parallel to glycolysis. It generates NADPH and pentoses (5-carbon sugars) as well as ribose 5-phosphate, a precursor for the synthesis of nucleotides.
What is the significance of the pentose phosphate pathway?
The pentose phosphate pathway (PPP) is a fundamental component of cellular metabolism. The PPP is important to maintain carbon homoeostasis, to provide precursors for nucleotide and amino acid biosynthesis, to provide reducing molecules for anabolism, and to defeat oxidative stress.
What regulates the pentose phosphate pathway?
The regulation of the pentose phosphate pathway is at the level of its first enzyme, namely, glucose-6-phosphate dehydrogenase, which is controlled by the redox state of the NADP couple, NADPH having a powerful feedback inhibition on this enzyme.
What is the fate of glucose 6-phosphate glycolytic intermediates?
Most glucose-6-phosphate enters the glycolytic pathway and is converted to fructose-6-phosphate and glyceraldehydes-3-phosphate.
Does the pentose phosphate pathway require oxygen?
The PPP does not consume or produce ATP and does not require molecular oxygen. In the early ‘oxidative phase’ of the PPP, during which the first carbon of the glucose skeleton is lost as carbon dioxide, nicotinamide adenine dinucleotide phosphate (NADP+) is converted to NADPH.
Is Phosphoglucomutase a liver?
Glucose 1-phosphate is isomerized to G-6-P by phosphoglucomutase. G-6-P is dephosphorylated to glucose by glucose-6-phosphatase (G6Pase), which is present in the liver, but not muscle. G6Pase is a key regulatory enzyme in gluconeogenesis.
What are the fates of glucose-6-phosphate?
Glucose 6-phosphate derived from glycogen can (1) be used as a fuel for anaerobic or aerobic metabolism as in, for instance, muscle; (2) be converted into free glucose in the liver and subsequently released into the blood; (3) be processed by the pentose phosphate pathway to generate NADPH or ribose in a variety of …
What is the fate of glucose 6 phosphate glycolytic intermediates?
