Ribosomal Synthesis of Macrocyclic Peptides in Vitro and in Vivo Mediated by Genetically Encoded Aminothiol Unnatural Amino Acids

Overview

Journal ACS Chem Biol

Publisher American Chemical Society

Specialties Biochemistry
Biology

Date 2015 May 2

PMID 25933125

Citations 24

Authors

John R Frost

Nicholas T Jacob

Louis J Papa

Andrew E Owens

Rudi Fasan

Affiliations

Soon will be listed here.

Abstract

A versatile method for orchestrating the formation of side chain-to-tail cyclic peptides from ribosomally derived polypeptide precursors is reported. Upon ribosomal incorporation into intein-containing precursor proteins, designer unnatural amino acids bearing side chain 1,3- or 1,2-aminothiol functionalities are able to promote the cyclization of a downstream target peptide sequence via a C-terminal ligation/ring contraction mechanism. Using this approach, peptide macrocycles of variable size and composition could be generated in a pH-triggered manner in vitro or directly in living bacterial cells. This methodology furnishes a new platform for the creation and screening of genetically encoded libraries of conformationally constrained peptides. This strategy was applied to identify and isolate a low-micromolar streptavidin binder (KD = 1.1 μM) from a library of cyclic peptides produced in Escherichia coli, thereby illustrating its potential toward aiding the discovery of functional peptide macrocycles.

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