A two-component 'double-click' approach to peptide stapling

Nature Protocols
Yu Heng LauDavid R Spring

Abstract

Peptide cyclization is a useful strategy for the stabilization of short flexible peptides into well-defined bioactive conformations, thereby enhancing their ability to interact with proteins and other important biomolecules. We present an optimized procedure for the stabilization of linear diazido peptides in an α-helical conformation upon reaction with dialkynyl linkers under Cu(I) catalysis. As this procedure generates side chain-cyclized peptides bearing a bis-triazole linkage, it is referred to as 'double-click' stapling. Double-click stapling can enhance the binding affinity, proteolytic stability and cellular activity of a peptide inhibitor. A distinguishing feature of double-click stapling is the efficiency with which peptides bearing different staple linkages can be synthesized, thus allowing for modular control over peptide bioactivity. This protocol describes the double-click reaction between a 1,3-dialkynylbenzene linker and peptides that contain azidoornithine. Subsequent peptide purification and confirmation steps are also described. The entire double-click stapling protocol can be completed in ∼48 h, including two overnight lyophilization steps.

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Feb 6, 2016·Bioconjugate Chemistry·Mohammad R JafariRatmir Derda
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