TPP is a coenzyme for transketolase, the enzyme that catalyzes the conversion of a ketopentose (xylulose-5-phosphate) and an aldopentose (ribose-5-phosphate) into an aldotriose (glyceraldehyde-3-phosphate) and a ketoheptose (sedoheptulose-7-phosphate). Notice that the total number of carbon atoms in the reactants and products does not change Propose a mechanism for this reaction.

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сњон сњон HOH transketolase 2- 2- H2OPO3 H20PO3 ribose-5-P H2OPO3 CH-OP03 xylulose-5-P glyceraldehyde-3-P sedoheptulose-7-P