KDC shows Divergent evolution, in which the genes for an enzyme with one substrate specificity give rise, during evolution, to closely related enzymes with different substrate specificities but the same enzymatic mechanism.

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#Unit 6. System Physiology – Plant

Reduction of 3-phosphoglycerate. The 3-phosphoglycerate is converted to three-carbon carbohydrates (triose phosphates) by enzymatic reactions driven by photochemically generated ATP and NADPH.

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#Unit 6. System Physiology – Plant

Regeneration of the CO2 acceptor ribulose 1,5-bisphosphate. 

The cycle is completed by regeneration of ribulose 1,5-bisphosphate through a series of ten enzyme-catalyzed reactions, one requiring ATP.

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#Unit 6. System Physiology – Plant

Carboxylation is catalyzed by

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#Unit 6. System Physiology – Plant

Reduction of 3-phosphoglycerate is catalyzed

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#Unit 6. System Physiology – Plant

Regeneration is catalyzed by

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#Unit 6. System Physiology – Plant

The fixation of three molecules of CO2 into one molecule of triose phosphate requires six molecules of NADPH and nine of ATP (3 CO2 : 6 NADPH : 9 ATP ≡ CO2 : 2 NADPH : 3 ATP).