Multiple Choice
Below are kinetic data comparing aldehyde dehydrogenase activity in the absence and presence of Agent A. What type of inhibitor is Agent A?
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7. Enzyme Inhibition and Regulation
Recap of Reversible Inhibition
Multiple Choice
Which of the following statements are true about enzyme inhibitors?
A
Competitive inhibitors change the slope of the Lineweaver-Burk line but not the y-intercept.
B
Noncompetitive inhibitors are a type of mixed inhibitor.
C
Uncompetitive inhibitors change Km & Vmax in a way to create a parallel Lineweaver-Burk line.
D
Noncompetitive inhibitors result in lines with increasing [I] to share the same x-intercept.
E
All the above are true.
Verified step by step guidance1
Understand the role of enzyme inhibitors: Enzyme inhibitors are molecules that bind to enzymes and decrease their activity. They can be classified into different types based on their mechanism of action.
Examine competitive inhibitors: Competitive inhibitors bind to the active site of the enzyme, competing with the substrate. In a Lineweaver-Burk plot, they increase the slope but do not affect the y-intercept, as they do not change Vmax but increase Km.
Explore noncompetitive inhibitors: Noncompetitive inhibitors bind to an allosteric site, not the active site, and can affect both Km and Vmax. They are a type of mixed inhibitor, as they can bind to the enzyme whether or not the substrate is present.
Analyze uncompetitive inhibitors: Uncompetitive inhibitors bind only to the enzyme-substrate complex, decreasing both Km and Vmax proportionally, resulting in a parallel shift of the Lineweaver-Burk plot.
Consider the effect of noncompetitive inhibitors on the Lineweaver-Burk plot: Noncompetitive inhibitors result in lines with increasing inhibitor concentration ([I]) that share the same x-intercept, as they do not affect Km.
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