A thiirane linker for isopeptide mimetics by peptide ligation

Abstract 2-Aminomethylthiirane was used to attach a 1,2-amino-thiol moiety at thiol groups of peptides for use in peptide ligation to produce isopeptide mimetics. To confirm the strategy, a ubiquitinated histone H3 peptide was prepared, and the ubiquitin was correctly folded judging from CD spectra with no influence by the random H3 peptide.