How do plants renew the RuBisCO used in photosynthesis?

Question

The RuBisCO in photosynthesis is an enzyme used to take the hydrogen and carbon from H2O and CO2 to leave out the oxygen and form glucose... But how does the plant keep restoring the RuBisCO for the gas exchange?

Answer 1

It is produced is such massive quantities during the hours of peak sunlight that it never really runs out. Plus, compared with other enzymes, RuBisCo is kind of slow. It is heavily controlled by inhibitors, not only to make sure that photosynthesis doesn't get out of control, but also to make sure the plant doesn't use up all of its stores of it. I seem to remember something about it being reused many, many times afterwards, but I am not sure about that. An interesting fact is that it is the most abundant protein in plants, and thus maybe the most abundant protein in the world.