The regeneration phase of photosynthesis is the second phase of the Calvin cycle, also known as the light-independent reactions. The purpose of this phase is to regenerate the starting molecule of the Calvin cycle, ribulose-1,5-bisphosphate (RuBP), so that the cycle can continue.
The key enzyme involved in the regeneration phase is called phosphoribulokinase (PRK). PRK catalyzes the phosphorylation of ribulose-5-phosphate (Ru-5-P) using ATP, resulting in RuBP. This enzyme is essential for replenishing RuBP in the Calvin cycle, as RuBP is a crucial molecule in the carbon fixation process.
The product of the regeneration phase is ribulose-1,5-bisphosphate (RuBP), which is then used as the starting molecule for the carbon fixation process in the Calvin cycle. RuBP combines with carbon dioxide (CO2) to form a six-carbon compound, which goes through a series of enzymatic reactions to produce glucose and other organic molecules.
Overall, the regeneration phase of photosynthesis ensures the continuous regeneration of RuBP, which is essential for the fixation and subsequent conversion of carbon dioxide into energy-rich organic molecules.
Regeneration phase of photosynthesis and it’s substrate enzyme and product
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