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Explain the synthesis of serine in photorespiration

 

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Serine is generated during photorespiration by a process involving glycine. The process starts in the chloroplast, where RuBisCO interacting with oxygen rather than carbon dioxide generates phosphoglycolate. From this molecule, glycolate is produced and then passes to the peroxisome for further conversion to glycine.

Two glycine molecules mix in the mitochondrial matrix to generate one molecule of serine and concurrently release carbon dioxide, ammonia, and NADH. The serine returns to the peroxisome undergoes glycerate oxidation, and then finds use in the Calvin cycle. Especially in surroundings with plenty of oxygen, this mechanism helps nitrogen and carbon recycling in plants.

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