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photorespiration. In a plant cell, the breakdown of a two-carbon compound produced by the Calvin cycle. The Calvin cycle produces the two-carbon compound, instead of its usual three-carbon product G3P, when leaf cells fix O2, instead of CO2. Photorespiration produces no sugar molecules or ATP.
The main steps go this way 1  -. Glucose is phosphorylated. Glucose has 5 carbons in its ring, and a side-chain carbon. 2  Glucose is symmetrically rearranged. The molecule becomes a 4-carbon ring, with another side-chain carbon on the other side of the oxygen bridge. 3  The new side-chain carbon is phosphorylated.