Question

In: Chemistry

If a histidine sidechain in a binding site is protonated in the free protein, but deprotonated...

If a histidine sidechain in a binding site is protonated in the free protein, but deprotonated in the ligand-bound state, how would pH affect the interaction?

A.) No effect

B.) Lower Kd at lower pH

C.) Higher Kd at lower pH

D.) Only ΔH would change with pH

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