Abstract
Initial reaction rates for the hydrolysis of nucleic acids with micrococcal endonuclease (EC 3.1.31.1) insolubilized on Sepharose are strongly influenced by diffusional limitations. Although the absolute values are low, they can be increased substantially by changing particle and pore size of the support, or enzyme concentration in the insoluble derivative. As a result of steric and diffusional limitations, the course of the reaction and selectivity to hydrolysis products for the insoluble derivatives are different to those of the native enzyme; the former produces mainly large and small fragments but few of intermediate size. Because of these differences in course and selectivity of the reaction, diffusional limitations become less important when high initial reaction rates are not required.
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