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Phosphoenolpyruvate carboxylase (PEPC) catalyzes the first step in the fixation of atmospheric CO 2 during C 4 photosynthesis. The crystal structure of C 4 form maize PEPC (ZmPEPC), the first structure of the plant PEPCs, has been determined at 3.0 A resolution. The structure includes a sulfate ion at the plausible binding site of an allosteric activator, glucose 6-phosphate...
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