Peptoid Residues Make Diverse, Hyperstable Collagen Triple-Helices.

Peptoid Residues Make Diverse, Hyperstable Collagen Triple-Helices.
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DOI:
10.1021/jacs.1c00708
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发表时间:
2021-07-28
影响因子:
15
通讯作者:
Yu, S. Michael
Yu, S. Michael
中科院分区:
化学1区
文献类型:
--
作者:
Kessler, Julian L.;Kang, Grace;Qin, Zhao;Kang, Helen;Whitby, Frank G.;Cheatham, Thomas E., III;Hill, Christopher P.;Li, Yang;Yu, S. Michael

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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 recapitulate collagen’s structures 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 sidechain 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 sidechains including a ‘click’-able alkyne and a photo-sensitive sidechain enable CMPs for functional applications including spatio-temporal 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.
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