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Langmuir. 2017 Jul 11;33(27):6647-6656. doi: 10.1021/acs.langmuir.7b00414. Epub 2017 Jun 27.

Graphite-Templated Amyloid Nanostructures Formed by a Potential Pentapeptide Inhibitor for Alzheimer's Disease: A Combined Study of Real-Time Atomic Force Microscopy and Molecular Dynamics Simulations.

Author information

1
Agricultural Nanocenter, School of Life Science, Inner Mongolia Agricultural University , 306 Zhaowuda Road, Hohhot 010018, China.
2
Cancer and Inflammation Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, National Cancer Institute at Frederick , Frederick, Maryland 21702, United States.
3
Materials Science and Engineering Program and Department of Mechanical and Aerospace Engineering, University of California San Diego , 9500 Gilman Drive, La Jolla, California 92093, United States.
4
Department of Bioengineering, University of California San Diego , 9500 Gilman Drive, La Jolla, California 92093 United States.
5
Department of Human Molecular Genetics and Biochemistry, Sackler School of Medicine, Tel Aviv University , Tel Aviv 69978, Israel.
6
Department of Biomedical Engineering, School of Basic Medical Sciences, Guangzhou Medical University , Guangzhou 511436, China.

Abstract

Self-assembly of peptides is closely related to many diseases, including Alzheimer's, Parkinson's, and prion diseases. Understanding the basic mechanism of this assembly is essential for designing ultimate cure and preventive measures. Template-assisted self-assembly (TASA) of peptides on inorganic substrates can provide fundamental understanding of substrate-dependent peptides assemble, including the role of hydrophobic interface on the peptide fibrillization. Here, we have studied the self-assembly process of a potential pentapeptide inhibitor on the surface of highly oriented pyrolytic graphite (HOPG) using real time atomic force microscopy (RT-AFM) as well as molecular dynamics (MD) simulation. Experimental and simulation results show nanofilament formation consisting of β-sheet structures and epitaxial growth on HOPG. Height analysis of the nanofilaments and MD simulation indicate that the peptides adopt a lying down configuration of double-layered antiparallel β-sheets for its epitaxial growth, and the number of nanofilament layers is concentration-dependent. These findings provide new perspective for the mechanism of peptide-based fibrillization in amyloid diseases as well as for designing well-ordered micrometrical and nanometrical structures.

PMID:
28605901
DOI:
10.1021/acs.langmuir.7b00414
[Indexed for MEDLINE]

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