A non-competitive enzyme inhibitor does not block the substrate from binding to

Question

A non-competitive enzyme inhibitor does not block the substrate from binding to the active site. Instead, it binds at another site and blocks the enzyme from catalyzing the reaction. Which of the following is true for this inhibition mechanism? A. Only the substrate or the inhibitor can be bound to the enzyme. B. The inhibitor reacts with the substrate and prevents binding of the substrate to the enzyme. C. The substrate and inhibitor can be bound at the same time. D. A non-competitive inhibitor changes the reaction from endergonic to exergonic. 62

Explanation / Answer

The answer is C. Both substrate and inhibitor can be bound to enzyme but this does not lead to product formation rather it must be converted back to enzyme-inhibitor or enzyme-substrate complex.

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