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Can arginine form a salt bridge to the side chain of a different amino acid, and if so, what kind of amino acid?
Can those negatively charged amino acid side chains bind protons?
I would not focus on the whole enzyme. The negatively charged amino acid side chains can form salt bridges to positively charged side chains such as arginine. What happens to the salt bridge if the negatively charged group accepts a proton?
If an aspartate in a salt bridge to an arginine becomes protonated, the interaction will weaken. Try to connect this to the rotary motion of the enzyme.
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