The oxidative photosynthetic carbon cycle or C2cycle

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Abstract
The oxidative photosynthetic carbon cycle (or C2 cycle) is the metabolic pathway responsible for photosynthetic oxygen uptake and the light‐dependent production of carbon dioxide that is termed photorespiration. The C2 and reductive C3 cycles coexist, and combined, represent total photosynthetic carbon metabolism. A brief historical review is presented beginning with the early observations of the oxygen inhibition of photosynthesis up to the discovery of the oxygenase activity associated with ribulose 1,5‐bisphosphate carboxylase/oxygenase. The properties and the role of the compartmentalization of the enzymes involved with the pathway and the transport of C2 cycle intermediates are reviewed. The relationship of the C2 cycle to photorespiratory nitrogen metabolism and other associated metabolic pathways and the properties and regulation of the C2 cycle in diverse photosynthetic organisms are discussed.

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