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une ch 29

pathways of sugar metabolism

pentose phosphate pathway function Functions: To make NADPH (used for detoxification [ie. glutathione synthesis] and Reductive Biosynthesis [ie. fatty acid synthesis]) and Ribose 5 phosphate (nucleotide synthesis) .
pentose phosphate pathway s/p Substrates: Glucose-6-phosphate and NADP+ Products: NADPH, CO2, ribose-5-phosphate, fructose-6-phosphate, and glyceraldehyde-3-phosphate
ppp pathways There are two routes the pathway can take, oxidative (irreversible) and nonoxidative (reversible).
ppp oxidative pathway The first pathway is the oxidative pathway. This is where NADPH, ribulose 5-phosphate, and CO2 are generated. This pathway is a substrate for glutathione reductase, fatty acid synthesis, cytochrome P450 monooxygenases, and deoxynucleotide synthesis.
ppp nonoxidative pathway The second pathway is the nonoxidative pathway. This pathway synthesizes ribose 5-phosphate.
ppp s/p/c/r Substrates: Glucose-6-phosphate and NADP+ Products: NADPH, CO2, ribose-5-phosphate, fructose-6-phosphate, and glyceraldehyde-3-phosphate Control Enzymes: Glucose-6-P dehydrogenase Regulation: Level of NADPH (product inhibition) (feedback inhibition)
ppp feedback inhibition Feedback inhibition: cells keep a high level of NADPH to push reactions forward, when levels of NADPH are high, oxidative pathway is inhibited. When NADPH levels are low, oxidative pathway is activated.
ppp compartment/tissues of interest Compartment(s): Cytosol Tissues of interest: Every cell in the body
Created by: carolanimal
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