【摘 要】
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Dear Editor,Phosphoenolpyruvate carboxylase (PEPC;EC 4.1.1.31) is located at an important branch point in the carbohydrate metabolism of plants.The enzyme is a
【机 构】
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Institute of Biochemical Plant Physiology, Cluster of Excellence on Plant Sciences(CEPLAS), Heinrich
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Dear Editor,Phosphoenolpyruvate carboxylase (PEPC;EC 4.1.1.31) is located at an important branch point in the carbohydrate metabolism of plants.The enzyme is a homotetramer and catalyzes the addition of bicarbonate to phosphoenolpyruvate (PEP) to form oxaloacetate and phosphate.PEPC is regulated by metabolites and phosphorylation.AIIosteric feedback inhibition is mainly regulated by L-malate and L-aspartate which bind to a site separated from the active center (Kai et al.,1999;Paulus et al.,2013).Structure analysis of PEPC from Escherichia coli (Kai et al.,1999;Matsumura et al.,2002),Zea mays (Matsumura et al.,2002),Flaveria trinervia,and F.pringlei (Paulus et al.,2013) revealed that the substrate PEP and the feedback inhibitors bind to separate sites within each monomer.
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