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Overview[edit] A carbonic anhydrase, or carbonate dehydratase, is a type of enzyme that rapidly catalyzes the conversion of carbon dioxide into a proton and the bicarbonate ion (HCO3-).
Carbon dioxide diffuses into the stroma of chloroplasts and combines with a five-carbon sugar, ribulose1,5-biphosphate (RuBP). The enzyme that catalyzes this reaction is referred to as RuBisCo, a large molecule that may be the most abundant organic molecule on the Earth.