Peptoid Residues Make Diverse, Hyperstable Collagen Triple-Helices

Julian L. Kessler, Grace Kang, Zhao Qin, Helen Kang, Frank G. Whitby, Thomas E. Cheatham, Christopher P. Hill, Yang Li, S. Michael Yu

Research output: Contribution to journalArticlepeer-review

Abstract

As the only ribosomally encoded N-substituted amino acid, proline promotes distinct secondary protein structures. The high proline content in collagen, the most abundant protein in the human body, is crucial to forming its hallmark structure: the triple-helix. For over five decades, proline has been considered compulsory for synthetic designs aimed at recapitulating collagen's structure and properties. Here we describe that N-substituted glycines (N-glys), also known as peptoid residues, exhibit a general triple-helical propensity similar to or greater than proline, enabling synthesis of stable triple-helical collagen mimetic peptides (CMPs) with unprecedented side chain diversity. Supported by atomic-resolution crystal structures as well as circular dichroism and computational characterizations spanning over 30 N-gly-containing CMPs, we discovered that N-glys stabilize the triple-helix primarily by sterically preorganizing individual chains into the polyproline-II helix. We demonstrated that N-glys with exotic side chains including a "click"-able alkyne and a photosensitive side chain enable CMPs for functional applications including the spatiotemporal control of cell adhesion and migration. The structural principles uncovered in this study open up opportunities for a new generation of collagen-mimetic therapeutics and materials.

Original languageEnglish (US)
Pages (from-to)10910-10919
Number of pages10
JournalJournal of the American Chemical Society
Volume143
Issue number29
DOIs
StatePublished - Jul 28 2021

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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