One of the most extensively characterized of these factors is PIF3, a basic helix-loophelix (bHLH) transcription factor that interacts with both phyA and phyB.

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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). 

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#Unit 6. System Physiology – Plant

The products of the catalytic cycle are either two molecules of 3-phosphoglycerate (carboxylase activity) or one molecule each of 3-phosphoglycerate and 2-phosphoglycolate (oxygenase activity).

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#Unit 6. System Physiology – Plant

Prior to CO2 fixation, Activation of RUBISCO/Carbamylation of RUBISCO takes place

1. Two protons are released. 

2. Binding of CO2 molecule on NH2 group

3. Binding of Mg2+ concentration upon illumination