The KM for the reaction of chymotrypsin with N -acetylvaline...

The $K_{M}$ for the reaction of chymotrypsin with $N$ -acetylvaline ethyl ester is $8.8 \times 10^{-2} \mathrm{M}$, and the $K_{M}$ for the reaction of chymotrypsin with $N$ -acetyltyrosine ethyl ester is $6.6 \times 10^{-4} \mathrm{M}$. (a) Which substrate has the higher apparent affinity for the enzyme? (b) Which substrate is likely to give a higher value for $V_{\max } ?$

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Key Concepts

Enzyme Kinetics

Enzyme kinetics is the study of the rates at which enzyme-catalyzed reactions proceed and how these rates change in response to variation in substrate concentration. This field utilizes mathematical models, most notably the Michaelis-Menten equation, to describe and predict the behavior of biochemical reactions under different conditions, aiding in the understanding of enzyme functionality.

Michaelis Constant (K?)

The Michaelis constant (K?) is a crucial parameter in enzyme kinetics that represents the substrate concentration at which the reaction velocity reaches half of its maximum value (V???). A lower K? value indicates a higher apparent affinity between the enzyme and its substrate, as it requires a lower concentration of substrate to achieve significant catalytic activity.

Maximum Velocity (V???)

V??? is the maximum rate of an enzyme-catalyzed reaction achieved when the enzyme is fully saturated with the substrate. It reflects the enzyme's catalytic capacity under optimal conditions and is influenced by the enzyme concentration and its catalytic efficiency, rather than the binding affinity between enzyme and substrate.

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