“…1,2 Consequently, such bioconjugated materials have played an essential role in advancing biotechnology and medical applications, which has led to more effective therapies as well as diagnostics. 2,3 To access bioconjugate materials, various click chemical reactions have been key, involving the reaction of synthetic groups with those present in proteins. 4−6 In proteins, amino acids like cysteine, serine, or lysine are, therefore, attractive target groups, with lysine exhibiting both the highest nucleophilicity and average surface accessibility on larger peptides and proteins.…”