Non-competitive inhibition

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Non-Competitive Inhibition: Kinetic Impact

Parameter Change in Non-Competitive Inhibition
V_{max} Latex Decreases (The inhibitor reduces the concentration of functional enzyme, regardless of how much substrate is added).
K_m Latex Unchanged (The inhibitor does not interfere with the binding of substrate to the active site; affinity remains the same).
High-Yield Core Realities:

  • Binding Mechanism: The inhibitor binds to an allosteric site (a site other than the active site) on both the free enzyme ($E$) and the enzyme-substrate complex ($ES$) with equal affinity.
  • Lineweaver-Burk Plot: The y-intercept ($1/V_{max}$) increases, reflecting the decreased $V_{max}$. The x-intercept ($-1/K_m$) remains at the same position, reflecting the unchanged $K_m$.
  • Clinical Comparison: Increasing the concentration of substrate $[S]$ cannot overcome non-competitive inhibition because the inhibitor is not competing for the active site.