Enzyme Kinetics of Reversible Inhibition

This video provides a detailed explanation of the effects of reversible inhibitors on enzyme kinetics. It begins by distinguishing between irreversible and reversible inhibitors, and then subdivides reversible inhibitors into competitive, uncompetitive, and noncompetitive types. For each type, the presenter explains how the inhibitor affects the maximum velocity (Vmax), the turnover number (kcat), and the Michaelis constant (Km). Competitive inhibitors increase the apparent Km but do not change Vmax or kcat, because they can be overcome by increasing substrate concentration. Uncompetitive inhibitors decrease Vmax and Km, but do not change kcat, because they bind only to the enzyme-substrate complex. Noncompetitive inhibitors decrease Vmax and kcat, but do not change Km, because they bind to an allosteric site regardless of substrate binding. The explanations are supported by graphical representations and equations, making the concepts accessible to students of biochemistry.