Open AccessDependence of the Calvin cycle activity on kinetic parameters for the interaction of non‐equilibrium cycle enzymes with their substrates
Author(s) -
PETTERSSON Gösta,
RYDEPETTERSSON Ulf
Publication year - 1989
Publication title -
european journal of biochemistry
Language(s) - English
Resource type - Journals
eISSN - 1432-1033
pISSN - 0014-2956
DOI - 10.1111/j.1432-1033.1989.tb15260.x
Subject(s) - catalytic cycle , enzyme , kinetic energy , saturation (graph theory) , kinetics , chemistry , thermodynamics , flux (metallurgy) , carbon dioxide , carbon cycle , biochemistry , biophysics , biology , physics , mathematics , ecology , organic chemistry , quantum mechanics , combinatorics , ecosystem
Kinetic model studies and control analyses of the Calvin photosynthesis cycle have been performed to characterize the dependence of the cycle activity on maximum velocities and K m values for the interaction of the non‐equilibrium cycle enzymes and ATP synthetase with their substrates under conditions of light and carbon dioxide saturation. The results show that K m values have no major influence on the cycle activity at optimal concentrations of external orthophosphate. The maximum cycle activity is controlled mainly by the catalytic capacities of ATP synthetase and sedoheptulose‐bisphosphatase, and is close to the maximum cycle flux that can be supported by these two enzymes.