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  • Name the two important enzymes of C_3 and C_4 pathway, respectively What important role do they play in fixing CO_2?

Name the two important enzymes of C3 and C4 pathway, respectively? What important role do they play in fixing CO2 ?

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The two vital enzymes of C3 and C4 pathways are RuBisCo and PEPcase, respectively. RuBisCo acts as a carbon dioxide acceptor in C3 plants, whereas PEPcase performs the same function in C4 plants. RuBisCo is known as RUBP Carboxylase Oxygenase. The enzyme possesses a better affinity towards CO2 than O2 .
Although, during the process of photorespiration, the enzyme binds with oxygen. The resultant products are of no value to the plant and result in low carbon fixation in C 3 plants.
PEPcase helps in the accepting CO 2 molecules in the C 4 plants. It combines with carbon dioxide to result in the formation of a 4-carbon compound called OAA or oxaloacetic acid. This is further converted into carbon dioxide. The CO2 formed produced carbohydrates in the Calvin cycle.

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