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Aug 29, 2017 - Abstract and Figures. A shift in primary carbon metabolism is the fastest response to oxidative stress. Induced within seconds, it precedes transcriptional regulation, and produces reducing equivalents in form of NADPH within the pentose phosphate pathway (PPP). PDF | There is a paradox in the oxidizing phase of the phosphate pentose pathway that has not yet been solved. The flow through the pathway is reduced. Mar 5, 2018 - In this process, ribulose-5-phosphate isomerizes to form two different sugars i.e., xylulose-5-phosphate and ribose-5-phosphate. These two sugars combine in the Jul 16, 2015 - 7.04.5.3.3 Pentose phosphate pathway The pentose isomers ribose-6-phosphate and xylulose-5 phosphate then combine under the enzyme transketolase toIt generates NADPH and pentoses (5-carbon sugars) as well as ribose 5-phosphate, a precursor for the synthesis of nucleotides. While the pentose phosphate pathway does involve oxidation of glucose, its primary role is anabolic rather than catabolic. The pathway is especially important in red blood cells (erythrocytes). 7.04.5.3.3 Pentose phosphate pathway The pentose isomers ribose-6-phosphate and xylulose-5 phosphate then combine under the enzyme transketolase toIt generates NADPH and pentoses (5-carbon sugars) as well as ribose 5-phosphate, a precursor for the synthesis of nucleotides. While the pentose phosphate pathway does involve oxidation of glucose, its primary role is anabolic rather than catabolic. The pathway is especially important in red blood cells (erythrocytes).