PyFzPEP Bicarbonate Pyr Oxaloacetate ruvate C-CHo-C- Ho-C CH2-C-C Guanosine0-P-0-P-0-P-0 GTP ∠ATP 丙酮酸羧化酶 PEP羧激酶 pyruvate GDP PEP carboxylase carboxykinase 线 ADP+P 粒 O--PO 体 Oxaloacetate CHo=C--CO0 胞质 Phosphoenolpyruvate (b)Py生成PEP 线 粒 体 丙酮酸羧化酶 胞 质 PEP羧激酶