What is the most abundant protein enzyme found in plants?

✅Explanation:
RuBisCO, or RuBP carboxylase/oxygenase, is the most abundant protein enzyme in plants. It plays a critical role in photosynthesis, the process by which plants capture energy from sunlight and convert it into food (glucose). RuBisCO fixes carbon dioxide from the atmosphere into organic molecules that the plant can use for growth and development.

🛑 Additional Information:
-RuBisCO stands for Ribulose-1,5-biphosphate carboxylase-oxygenase.
-It is a chief enzyme of the Calvin cycle in photosynthesis. It is present in the stroma.

• RuBisCO is called the most abundant enzyme in the world because:
-Its active site can bind with both CO2 and O2 i.e. RuBisCO can act as both carboxylase as well as oxygenase.
-It acts as carboxylase at a lower concentration of oxygen and a higher concentration of carbon dioxide. It catalyzes the process of carboxylation of 5C compound Ribulose-1,5-bisphosphate into a 6C compound 3-phosphoglycerate in the Calvin cycle
-It acts as an oxygenase at a higher concentration of oxygen and a low concentration of carbon dioxide. This causes photorespiration in C3 plants which is a wasteful process.
      2. RuBisCO comprises about 15-50% of total chloroplast proteins.