PEP carboxylase



An enzyme in the carboxylases responsible for the formation of the four-carbon compound oxaloacetate by catalyzing the binding of one molecule of carbon dioxide to the three-carbon compound phosphoenolpyruvate.


PEP carboxylase is vital in CAM and C4 plants during photosynthesis. It serves as the catalyst for the following chemical reaction:

PEP + CO2oxaloacetate + Pi

Word origin: from the abbreviation of phosphoenolpyruvate carboxylase

Variant: PEPC, PEPCase

See also: CAM plant, C4 plant

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