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Phosphoenolpyruvate carboxylase (ortho-phosphate: oxaloacetate carboxylase, EC 4.11.31, PEPCase), an enzyme widely occurringin bacteria, algae and plants, is an importantcarboxylating enzyme serving a variety of func-tions ranging from photosynthetic carbon dioxidefixation to nitrogen assimilation (Latzko andKelly 1983, O’Leary 1982). It is a key regula-tory enzyme in both C_4 and CAM photosyn-thesis. In C_4 plants, PEPCase is localized inthe mesophyll-cell cytoplasm and catalyzesthe conversion of PEP and bicarbonate to
Phosphoenolpyruvate carboxylase (ortho-phosphate: oxaloacetate carboxylase, EC 4.11.31, PEPCase), an enzyme widely occurring in bacteria, algae and plants, is an important carboxyboxylating enzyme serving a variety of func-tions ranging from photosynthetic carbon dioxide fixation to nitrogen assimilation (Latzko and Kelly 1983, O’Leary 1982). It is a key regula-tory enzyme in both C_4 and CAM photosyn-thesis. In C_4 plants, PEPCase is localized in mesophyll-cell cytoplasm and catalyzesthe transformation of PEP and bicarbonate to