The binding of a compound to an enzyme is observed to slow down or stop the rate of the reaction catalyzed by the enzyme. increasing the substrate concentration reduces the inhibitory effects of this compound. which of the following could account for this observation?
a) the compound reduces disulfide bonds, causing the enzyme molecules to partially unfold.
b) the compound causes a cofactor to be lost from the enzyme.
c) the compound forms a covalent bond with one of the amino acid residues needed for enzyme activity.
d) the compound is a negative allosteric regulator.
e) the compound is a competitive inhibitor.
The correct answer is e. The compound is a competitive inhibitor.
An enzyme is a biologic catalyzer, it means a macromolecule that facilitates the occurrence of a particular reaction (conversion of reactants to products).
The rate at which an enzyme catalyze a reaction is affected by other compounds that interferes in the enzyme activity, leading to different degrees of inhibition, that can be reversible or irreversible. In the case of reversible inhibition, when there is a change in a condition, the activity of the enzyme and the rate of reaction are reestablished. A competitive inhibitor is a compound that competes with the enzyme for the substrate, causing a rate reduction. When you increase the amount of substrate, the activity and rate at which the enzyme usually acts, is reestablished.
A competitive inhibitor slows down the enzyme by competing with the substrate for binding at the active site. Increasing substrate concentrations will reduce the effectiveness of a competitive inhibitor.
The correct answer is A the compound is a competitive inhibitor
Competitive inhibitor competes with the substrate to bind to the active site of the target enzyme and after binding to the active site the inhibitor slow down or stop the reaction catalyzed by that enzyme.
Competitive inhibitor basically effects the Km value of the enzyme thus decreasing the activity of the later.
Increasing the substrate concentration displace the inhibitor from the enzyme"s active site thus reducing the inhibitory effects of the later thus increasing the activity of the enzyme.
The correct answer is option e) "The compound is a competitive inhibitor".
A competitive inhibitor is a compound that resembles the normal substrate of an enzyme, resulting in the enzyme binding to the inhibitor and preventing that the enzyme catalyzes the reaction. The effect of the inhibitor is to slow down or stop the rate of the reaction catalyzed by the enzyme. Usually the action of this type of inhibitor is reduced by an increase in the substrate's concentration. Therefore, the compound described in the question belongs to a competitive inhibitor.
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