Interpretation of the kinetics of consecutive enzyme-catalysed reactions: studies on the arginase-ornithine carbamoyltransferase system.
A method that permits the use of measurements on the concentration of the intermediate in a coupled enzymic assay in determining the presence or absence of an interaction between the enzymes is presented. The method is shown to be closely analogous to a previously formulated procedure involving the determination of the rate of production of the final product of such a sequence and is shown to be applicable regardless of the complexity of the operative kinetic mechanisms, provided it may be assumed that all enzyme-substrate complexes are in the steady-state. Kinetic results obtained with the arginase-ornithine carbamoyltransferase couple, in which the intermediate ornithine is monitored, are examined in these terms to conclude that no heterogeneous association is operative between the enzymes.
D000818:Animals; D001119:Arginase / Q000378:metabolism*; D002417:Cattle; D007700:Kinetics; D008099:Liver / Q000201:enzymology; D008433:Mathematics; D009097:Multienzyme Complexes / Q000378:metabolism*; D009954:Ornithine Carbamoyltransferase / Q000378:metabolism*
D009097:Multienzyme Complexes; D009954:Ornithine Carbamoyltransferase; D001119:Arginase