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Question

What is RuBisCo? Explain its role in C3 and C4 photosynthesis.

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Solution

C3 and C4 plants have Ribulose 1, 5- bisphosphate carboxylase/oxygenase (RuBisCO) enzyme present in the mesophyll cells of the leaves. It is a key enzyme which catalyzes carboxylation reaction during photosynthesis. It is the most abundant protein on earth.
In C3 plants it occurs in the mesophyll cells. It causes photorespiration. In C4 plants, it occurs in the bundle sheath cells. Instead of RuBisCO, they have another enzyme called phosphoenolpyruvate carboxylase (PEP carboxylase).

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