The quantitative relations between diffusion-controlled reaction rate and characteristic parameters in enzyme-substrate reactions systems. II. Charged substrates.

The quantitative relationship between the spatial factor and the force-range factor on the one hand and the ionic strength and the charges of reactants on the other has been calculated for non-spherically symmetric reaction systems. New upper limits of combination reactions between enzymes and charged substrates have been obtained. Applying the calculated results to the reactions catalyzed by fumarase and D-glyceraldehyde-3 phosphate dehydrogenase, we have been able to interpret experimental phenomena which could not be accounted for by the conventional theory of the diffusion-controlled reaction. Furthermore, the conditions under which the Bronsted equation is valid in the non-equilibrium steady state reaction system have been discussed.