Volume 127, Issue 7 pp. 2273-2278
Zuschrift

Chirality-Assisted Ring-Like Aggregation of Aβ(140) at Liquid–Solid Interfaces: A Stereoselective Two-Step Assembly Process

Guanbin Gao

Guanbin Gao

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (PR China)

These authors contributed equally to this work.

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Prof. Mingxi Zhang

Prof. Mingxi Zhang

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (PR China)

These authors contributed equally to this work.

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Dr. Pei Lu

Dr. Pei Lu

Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (PR China)

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Dr. Guanlun Guo

Dr. Guanlun Guo

Hubei Key Laboratory of Advanced Technology of Automotive Components, Wuhan University of Technology, Wuhan 430070 (PR China)

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Prof. Dong Wang

Prof. Dong Wang

Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (PR China)

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Prof. Taolei Sun

Corresponding Author

Prof. Taolei Sun

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (PR China)

School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070 (PR China)

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (PR China)Search for more papers by this author
First published: 22 December 2014
Citations: 12

This work was supported by National Natural Science Foundation of China (91127027, 51173142, 21105078), the China National Funds for Distinguished Young Scientists (51325302), the Major State Basic Research Development Program of China (973 Program: 2013CB933002), the Program for Changjiang Scholars and Innovative Research Team in University (IRT1169), and the Program of Introducing Talents of Discipline to Universities (B13035).

Abstract

Molecular chirality is introduced at liquid–solid interfaces. A ring-like aggregation of amyloid Aβ(1–40) on N-isobutyryl-L-cysteine (L-NIBC)-modified gold substrate occurs at low Aβ(1–40) concentration, while D-NIBC modification only results in rod-like aggregation. Utilizing atomic force microscope controlled tip-enhanced Raman scattering, we directly observe the secondary structure information for Aβ(1–40) assembly in situ at the nanoscale. D- or L-NIBC on the surface can guide parallel or nonparallel alignment of β-hairpins through a two-step process based on electrostatic-interaction-enhanced adsorption and subsequent stereoselective recognition. Possible electrostatic interaction sites (R5 and K16) and a chiral recognition site (H14) of Aβ(1–40) are proposed, which may provide insight into the understanding of this effect.

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