UAA crosslinker 1 HCl is tailored for amber?codon suppression, enabling in vivo incorporation of non-canonical amino acids via wild-type or engineered aminoacyl-tRNA synthetases. Its azide moiety supports copper-catalyzed azide–alkyne cycloaddition (CuAAC) with alkynes and strain-promoted azide–alkyne cycloaddition (SPAAC) with DBCO or BCN reagents.
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