Detecting Photoactivation of Phosphoenolpyruvate Carboxylase in C(4) Plants : An Effect of pH.

@article{Karabourniotis1985DetectingPO,
  title={Detecting Photoactivation of Phosphoenolpyruvate Carboxylase in C(4) Plants : An Effect of pH.},
  author={George Karabourniotis and Yiannis Manetas and Nikos A. Gavalas},
  journal={Plant physiology},
  year={1985},
  volume={77 2},
  pages={
          300-2
        }
}
Photoactivation of phosphoenolpyruvate carboxylase in C(4) plants is detected more efficiently when activity is assayed at suboptimum pH (e.g. 7.2); the magnitude of the light effect is often larger at low phosphoenolpyruvate concentration.Darkness and low assay pH induce an allosteric behavior (positive cooperativity with phosphoenolpyruvate) which is relieved in light or by higher pH; thus, normal Michaelis-Menten kinetics are exhibited only when the enzyme is extracted during the day and… CONTINUE READING
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