Which amino acid of a polypeptide would become labeled when the polypeptide is treated with 2,4-dinitrofluorobenzene in base,even though the amino acid is not a terminal amino acid?

Question

Quizplus · Accepted Answer

2,4-dinitrofluorobenzene reacts with the ε-amino group of lysine residues in the presence of a base. Therefore, lysine would become labeled even if it is not a terminal amino acid in the polypeptide. The other amino acids listed do not have an ε-amino group available for labeling with this reagent.

Which Amino Acid of a Polypeptide Would Become Labeled When