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G6P G6P G6P OXIDATIVE NADPH (NADPH co, 2 (NADPH PHASE 6PG 6PG RUSP NADPH NADPH F6P GAP co, RUSP RUSP FBP Glycolysis NONOXIDATIVE PHASE DHAP GAP R5P 2 (ATP G6P Nucleotides Pyruvate GAP F6P co, (a) Nucleotide synthesis. When the primary need is for nucleotide biosynthesis, the primary product is ribose-5-phosphate. Acetyl-CaA DHAP FBP Citric acid cycle (b) NADPH synthesis. When the primary need is for reducing power (NADPH), fructose FADH co, phosphates are reconverted to glucose-6-phosphate for reaxidation in the oxidative phase. (NADH ABBREVIATIONS G6P = glucose-6-phosphate 6PG = 6-phosphogluconate RSP = ribose-5-phosphate RUSP - ribulose-5-phosphate GAP = glyceraldehyde-3-phosphate F6P = fructose-6-phosphate DHAP = dihydroxyacetone phosphate FBP = fructose-1,6-bisphosphate (b) Energy generation. When only moderate quantities of pentose phosphates and NADPH are needed, the pathway can also be used to supply energy, with the reaction products being oxidized through glycolysis and the citric acid cycle.

G6P G6P G6P OXIDATIVE NADPH (NADPH co, 2 (NADPH PHASE 6PG 6PG RUSP NADPH NADPH F6P GAP co, RUSP RUSP FBP Glycolysis NONOXIDATIVE PHASE DHAP GAP R5P 2 (ATP G6P Nucleotides Pyruvate GAP F6P co, (a) Nucleotide synthesis. When the primary need is for nucleotide biosynthesis, the primary product is ribose-5-phosphate. Acetyl-CaA DHAP FBP Citric acid cycle (b) NADPH synthesis. When the primary need is for reducing power (NADPH), fructose FADH co, phosphates are reconverted to glucose-6-phosphate for reaxidation in the oxidative phase. (NADH ABBREVIATIONS G6P = glucose-6-phosphate 6PG = 6-phosphogluconate RSP = ribose-5-phosphate RUSP - ribulose-5-phosphate GAP = glyceraldehyde-3-phosphate F6P = fructose-6-phosphate DHAP = dihydroxyacetone phosphate FBP = fructose-1,6-bisphosphate (b) Energy generation. When only moderate quantities of pentose phosphates and NADPH are needed, the pathway can also be used to supply energy, with the reaction products being oxidized through glycolysis and the citric acid cycle.

Introduction to General, Organic and Biochemistry
Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter23: Enzymes
Section: Chapter Questions
Problem 23.88P
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Write a balanced chemical equation for the pentose phosphate pathway in the first two modes depicted in Figure , where

(a) ribose-5-phosphate synthesis is maximized and

(b) NADPH production is maximized, by conversion of the sugar phosphate products to glucose-6-phosphate for repeated operations of the pathway

G6P G6P G6P OXIDATIVE NADPH (NADPH co, 2 (NADPH PHASE 6PG 6PG RUSP NADPH NADPH F6P GAP co, RUSP RUSP FBP Glycolysis NONOXIDATIVE PHASE DHAP GAP R5P 2 (ATP G6P Nucleotides Pyruvate GAP F6P co, (a) Nucleotide synthesis. When the primary need is for nucleotide biosynthesis, the primary product is ribose-5-phosphate. Acetyl-CaA DHAP FBP Citric acid cycle (b) NADPH synthesis. When the primary need is for reducing power (NADPH), fructose FADH co, phosphates are reconverted to glucose-6-phosphate for reaxidation in the oxidative phase. (NADH ABBREVIATIONS G6P = glucose-6-phosphate 6PG = 6-phosphogluconate RSP = ribose-5-phosphate RUSP - ribulose-5-phosphate GAP = glyceraldehyde-3-phosphate F6P = fructose-6-phosphate DHAP = dihydroxyacetone phosphate FBP = fructose-1,6-bisphosphate (b) Energy generation. When only moderate quantities of pentose phosphates and NADPH are needed, the pathway can also be used to supply energy, with the reaction products being oxidized through glycolysis and the citric acid cycle.
Transcribed Image Text:G6P G6P G6P OXIDATIVE NADPH (NADPH co, 2 (NADPH PHASE 6PG 6PG RUSP NADPH NADPH F6P GAP co, RUSP RUSP FBP Glycolysis NONOXIDATIVE PHASE DHAP GAP R5P 2 (ATP G6P Nucleotides Pyruvate GAP F6P co, (a) Nucleotide synthesis. When the primary need is for nucleotide biosynthesis, the primary product is ribose-5-phosphate. Acetyl-CaA DHAP FBP Citric acid cycle (b) NADPH synthesis. When the primary need is for reducing power (NADPH), fructose FADH co, phosphates are reconverted to glucose-6-phosphate for reaxidation in the oxidative phase. (NADH ABBREVIATIONS G6P = glucose-6-phosphate 6PG = 6-phosphogluconate RSP = ribose-5-phosphate RUSP - ribulose-5-phosphate GAP = glyceraldehyde-3-phosphate F6P = fructose-6-phosphate DHAP = dihydroxyacetone phosphate FBP = fructose-1,6-bisphosphate (b) Energy generation. When only moderate quantities of pentose phosphates and NADPH are needed, the pathway can also be used to supply energy, with the reaction products being oxidized through glycolysis and the citric acid cycle.
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