catalyzed by the enzymeribulose biphosphate carboxylase. The reduction Of C02 tocarbohydrate (fructose diphosphate) is completed via several more steps of thecycle. Finally, RUBP is regenerated sothat the cycle may continue.由ATP和NADPH驱动的暗反应中,二氧化碳转化成碳水化合物。即卡尔文循环。二磷酸核酮糖固定二氧化碳,由二磷酸核酮糖羧化酶催化。