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Copper-free Huisgen Cycloaddition for the 14-3-3-Templated Synthesis of Fusicoccin-Peptide Conjugates.

Ryoma Masuda,Yuuya Kawasaki,Kazunobu Igawa,Y. Manabe,H. Fujii,N. Kato,K. Tomooka,J. Ohkanda

Published 2020 in Chemistry - An Asian Journal

ABSTRACT

Mid-sized molecules have emerged as an attractive chemical space and potentially provide a robust basis for the development of synthetic agents to control intracellular protein interactions. However, the limited cell permeability and chemical tractability of such agents remain to be addressed. We envisioned that target-templated synthesis of such mid-sized molecules might provide a solution. Here, we exploited copper-free Huisgen cycloaddition for template synthesis using a peptide fragment containing a 4,8-diazacyclononyne (DACN) moiety and an azide-containing fusicoccin derivative in the presence or absence of recombinant 14-3-3ζ protein in vitro. Time-course changes in the yield of products demonstrated that the reaction was accelerated in the presence of 14-3-3 and one of the regioisomers was generated predominantly, supporting the template effect.

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