Question
What conditions enable RuBisCO to function as an oxygenase? Explain the ensuring process.
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Answer
Carboxylation is the most crucial step of the Calvin cycle, where $\mathrm{CO}_2$ is utilised for the carboxylation of RuBP. This reaction is catalysed by the enzyme RuBP carboxylase, which results in the formation of two molecules of 3-PGA. Since, this enzyme also has an oxygenation activity, it would be more correct to call it RuBP carboxylase oxygenase or RuBisCO.
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