Terminal repeats impact collagen triple-helix stability through hydrogen bonding

被引:21
作者
Qi, Yingying [1 ,2 ,3 ,4 ]
Zhou, Daoning [1 ,2 ]
Kessler, Julian L. [5 ]
Qiu, Rongmao [1 ,2 ]
Yu, S. Michael [5 ]
Li, Gang [3 ]
Qin, Zhao [6 ]
Li, Yang [1 ,2 ]
机构
[1] Sun Yat Sen Univ, Affiliated Hosp 5, Guangdong Prov Key Lab Biomed Imaging, Zhuhai 519000, Peoples R China
[2] Sun Yat Sen Univ, Affiliated Hosp 5, Guangdong Prov Engn Res Ctr Mol Imaging, Zhuhai 519000, Peoples R China
[3] Sun Yat Sen Univ, Affiliated Hosp 5, Cardiac Surg & Struct Heart Dis Unit, Cardiovasc Ctr, Zhuhai 519000, Peoples R China
[4] Sun Yat Sen Univ, Affiliated Hosp 5, Dept Radiol, Zhuhai 519000, Peoples R China
[5] Univ Utah, Dept Biomed Engn, Salt Lake City, UT 84112 USA
[6] Syracuse Univ, Dept Civil & Environm Engn, Coll Engn & Comp Sci, Syracuse, NY 13244 USA
基金
中国国家自然科学基金;
关键词
SIDE-CHAIN CONFORMATION; COMPUTATIONAL DESIGN; MOLECULAR-STRUCTURE; STRUCTURAL BASIS; PROTEIN; PEPTIDE; SEQUENCE; RESIDUES; DYNAMICS; CRYSTAL;
D O I
10.1039/d2sc03666e
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nearly 30% of human proteins have tandem repeating sequences. Structural understanding of the terminal repeats is well-established for many repeat proteins with the common alpha-helix and beta-sheet foldings. By contrast, the sequence-structure interplay of the terminal repeats of the collagen triple-helix remains to be fully explored. As the most abundant human repeat protein and the most prevalent structural component of the extracellular matrix, collagen features a hallmark triple-helix formed by three supercoiled polypeptide chains of long repeating sequences of the Gly-X-Y triplets. Here, with CD characterization of 28 collagen-mimetic peptides (CMPs) featuring various terminal motifs, as well as DSC measurements, crystal structure analysis, and computational simulations, we show that CMPs only differing in terminal repeat may have distinct end structures and stabilities. We reveal that the cross-chain hydrogen bonding mediated by the terminal repeat is key to maintaining the triple-helix's end structure, and that disruption of it with a single amide to carboxylate substitution can lead to destabilization as drastic as 19 degrees C. We further demonstrate that the terminal repeat also impacts how strong the CMP strands form hybrid triple-helices with unfolded natural collagen chains in tissue. Our findings provide a spatial profile of hydrogen bonding within the CMP triple-helix, marking a critical guideline for future crystallographic or NMR studies of collagen, and algorithms for predicting triple-helix stability, as well as peptide-based collagen assemblies and materials. This study will also inspire new understanding of the sequence-structure relationship of many other complex structural proteins with repeating sequences.
引用
收藏
页码:12567 / 12576
页数:10
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