期刊
ACS CHEMICAL NEUROSCIENCE
卷 2, 期 6, 页码 281-287出版社
AMER CHEMICAL SOC
DOI: 10.1021/cn200006h
关键词
GNNQQNY; thioflavin T; binding mode; amyloid; labeling molecule; scanning tunneling microscopy
资金
- National Basic Research Program of China [2009CB930100, 2011CB932800]
- Chinese Academy of Sciences [KJCX2-YW-M15]
- National Natural Science Foundation of China [209111-30229]
The widely used method to monitor the aggregation process of amyloid peptide is thioflavin T (ThT) assay, while the detailed molecular mechanism is still not clear. In this work, we report here the direct identification of the binding modes of ThT molecules with the prion peptide GNNQQNY by using scanning tunneling microscopy (STM). The assembly structures of GNNQQNY were first observed by STM on a graphite surface, and the introduction of ThT molecules to the surface facilitated the STM observations of the adsorption conformations of ThT with peptide strands. ThT molecules are apt to adsorb on the peptide assembly with beta-sheet structure and oriented parallel with the peptide strands adopting four different binding modes. This effort could benefit the understanding of the mechanisms of the interactions between labeling species or inhibitory ligands and amyloid peptides, which is keenly needed for developing diagnostic and therapeutic approaches.
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