Abstract
Kinetic properties of pig heart citrate synthase immobilized on Sepharose were determined. Compared to the free enzyme the Km values for both acetyl-CoA and oxalacetate were increased. The kinetic pattern of the Lineweaver-Burk plots of both substrates for the immobilized enzyme was that of lines intersecting on thex axis. This is the same as that obtained for the free enzyme and indicates that there is no change in the kinetic mechanism of the reaction. The pH response and the Arrhenius plot of both the immobilized and free enzyme were the same. The enzymes show a break in their Arrhenius plots. The immobilized enzyme exhibits greater heat stability than does the free enzyme.
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