, Volume 169, Issue 3, pp 356–360

An efficient method for the determination of Km values for HCO3- of phosphoenolpyruvate carboxylase

  • H. Bauwe

DOI: 10.1007/BF00392131

Cite this article as:
Bauwe, H. Planta (1986) 169: 356. doi:10.1007/BF00392131


One of the most serious problems in obtaining estimates of the Km values for HCO3-of phosphoenolpyruvate carboxylase (PEPCase; EC by measurement of initial rates at varying HCO3-is the impossibility of completely excluding any contaminating HCO3-. A method is proposed which has no need for the careful control of HCO3-/CO2 contamination. The kinetic data are obtained by the evaluation of progress curves of HCO3-consumption. The method is discussed and the Km values for HCO3-of PEPCase from several C4-species are presented.

Key words

C4-species (PEPCase)Kinetic properties (PEPCase)Phosphoenolpyruvate carboxylase


C3, C4

assimilated CO2 initially found in 3-phosphoglycerate (C3) or malate and aspartate (C4)


oxaloacetic acid




phosphoenolpyruvate carboxylase

Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • H. Bauwe
    • 1
  1. 1.Zentralinstitut für Genetik und Kulturpflanzenforschung der Akademie der Wissenschaften der DDRGaterslebenGerman Democratic Republic