Enzyme Inhibitors
9 important questions on Enzyme Inhibitors
What is an irreversible inhibitor?
*Penicillin
What is Reversible inhibition and which forms are there?
1. Competitive
2. Uncompetitive
3. Noncompetitive
4. Mixed
What is competitive inhibition?
The competitive inhibitor often resembles the substrate and binds to the active site of the enzyme, leaving it blocked for the substrate.
A competitive inhibitor diminishes the rate of catalysis by reducing the proportion of enzyme molecules bound to a substrate.
Competitive inhibition can be relieved by increasing the substrate concentration. Then the substrate successfully competes with the inhibitor for the active site.
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What is uncompetitive inhibition?
Binds only to ES-complex
* cannot be overcome by the addition of more substrate
What is noncompetitive inhibition?
A noncompetitive inhibitor acts by decreasing the concentration of functional enzyme rather than by diminishing the proportion of enzyme molecules that are bound to the substrate.
Decreases the turnover number.
What is mixed inhibition?
What happens with the Km and Vmax when a competitive inhibitor is used?
What is the effect of uncompetitive inhibtion on the Km and Vmax?
Km is lower because the inhibitor binds to ES to form ESI, depleting ES.
What happens with Km and Vmax when a noncompetitive inhibitor is used?
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