In photorespiration, what is the function of RuBisCO?

In photorespiration, RuBisCO catalyses the oxygenation of RuBP to one molecule of PGA and phosphoglycolate. PGA move into the Calvin cycle, while the phosphoglycolate is hydrolysed to form glycolate. Glycolate then passes to the peroxisome, where it is oxidised to glyoxylate, which in turn is aminated to form glycine. Glycine enters the mitochondria where two molecules of glycine condense to form a molecule of serine with the release of CO2 and ammonia. Serine moves back to the peroxisome, where it is deaminated to glycerate, which passes to the chloroplast for synthesis of photosynthetic product and photorespiration, thus completing the cycle.

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