Question

Derive Michaelis-Menten equation for a competitive inhibitor.

09 Jan 2025
Answer :
Word Count : 551

The Michaelis-Menten equation describes the kinetics of enzyme-catalyzed reactions and is fundamental in understanding enzyme-substrate interactions. It provides a relationship between the reaction rate (v) and the substrate concentration ([S]) for an enzyme-catalyzed reaction. In the presence of a competitive inhibitor, the equation is modified to account for the competition between the inhibitor and the substrate for the enzyme's active site.

Basic Enzyme Kinetics:

The standard Michaelis-Menten equation for an enzyme-catalyzed reaction is given by:

v=Vmax[S]Km+[S]v = \frac{{V_{\text{max}}[S]}}{{K_m + [S]}}

where:

  • vv is the reaction rate,
  • VmaxV_{\text{max}} is the maximum reaction rate,
  • [S][S] is the concentration of the substrate,
  • KmK_m is the Michaelis constant, representing the substrate concentration at half-maximal velocity.

This equation assumes that the enzyme binds to the substrate to form an enzyme-substrate complex (ES), which then proceeds to form product. The rate ___ ____ _____ ______ ___.
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