Regulation of Pyruvate,Orthophosphate Dikinase From Maize Leaves.Magnesium-dependent Dimer-tetramer Interconversion

  • Hitoshi Nakamoto


Pyruvate, orthophosphate dikinase(PPDK, EC, a key enzyme in the C4 pathway of photosynthesis, catalyzes the formation of phosphoenolpyruvate(PEP) as follows: Pyruvate + MgATP + Pi = PEP + AMP + MgPPi The amount of magnesium ion required for the reaction appears to be much more than that required for the formation of MgATP and MgPPi complexes(1). The plant enzyme is a homotetramer and dissociates to inactive dimer or monomer in the absence of magnesium ion or under cold treatment(1).


Closed Circle Elution Profile Incubation Mixture Quaternary Structure Basic Buffer 
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  1. 1.
    Edwards, G.E.,Nakamoto, H.,Burnell, J.N. and Hatch, M.D. (1985) Ann.Rev. Plant Physiol. 36, 255–286.CrossRefGoogle Scholar
  2. 2.
    Nakamoto, H. and Edwards, G.E. (1987) Biochim.Biophys.Acta 924,360–368.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Hitoshi Nakamoto
    • 1
  1. 1.Dept of Biochemistry, Faculty of ScienceSaitama UniversityUrawa, Saitama 338Japan

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