What is the reverse citric acid cycle (reductive TCA cycle)?
A pathway of CO2 fixation. It requires 4 NADH, 2 reduced ferredoxins, and 10 ATP to synthesize 1 glucose from 6 CO2. Therefore it's more efficient than the Calvin cycle. Most of the reactions are catalyzed by reverse reactions of enzymes of the citric acid cycle, but it requires the activity of unique enzymes. Also, citrate synthase is replaced by citrate lyase, and succinate dehydrogenase by fumarate reductase.