Which amino acid component is most likely to serve as a proton donor in an enzyme's active site?

Name: Which amino acid component is most likely to serve as a proton donor in an enzyme's active site?
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Question

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Among the given options, glutamic acid has a carboxylic acid side chain which is capable of donating a proton during the enzyme-catalyzed reactions. This property of glutamic acid makes it a common amino acid residue in the active sites of many enzymes.

Which Amino Acid Component Is Most Likely to Serve as a Proton