Assembly of branched ubiquitin oligomers by click chemistry

Ubiquitin monomers functionalized with an azide or multiple alkynes were utilized for the assembly of branched ubiquitin oligomers (K6/K11, K11/K48, K11/K63, K6/K11/K48) by click chemistry. The oligomers resist deubiquitylase-catalysed hydrolysis and exhibit stability in eukaryotic cell lysates.