Kinetic analysis of a simplified scheme of autocatalytic zymogen activation

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Abstract

Proteolytic enzymes are usually biosynthesized as somewhat larger inactive precursors known as zymogens. These zymogens must undergo an activation process, usually a limited proteolysis, to attain their catalytic activity. When the activating enzyme and the activated enzyme coincide, the process is an autocatalytic zymogen activation. In the present study, a kinetic analysis of the entire progress curve for the autocatalytic zymogen activation reactions is presented. On the basis of the kinetic equations, a novel procedure is developed to evaluate the kinetic parameters of the reactions. This procedure is particularly useful for the fast zymogen autoactivation reactions. As two examples, the novel procedure is used to analyse the autocatalytic activation of bovine trypsinogen and human blood coagulation factor XII (Hageman factor).

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Wu, J. W., Wu, Y., & Wang, Z. X. (2001). Kinetic analysis of a simplified scheme of autocatalytic zymogen activation. European Journal of Biochemistry, 268(6), 1547–1553. https://doi.org/10.1046/j.1432-1327.2001.01914.x

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