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Platinum-Ion-Mediated Self-Assembly of Hairpin Peptides and Synthesis of Platinum Nanostructures

Author:
Wang, Jiqian, Zhang, Liyan, Yang, Jingge, Yan, Hongyu, Li, Xiran, Wang, Chengdong, Wang, Dong, Sun, Yawei, Xu, Hai
Source:
Langmuir 2019 v.35 no.16 pp. 5617-5625
ISSN:
1520-5827
Subject:
atomic force microscopy, calorimetry, circular dichroism spectroscopy, histidine, ions, nanofibers, nanorods, peptides, platinum, titration, ultraviolet-visible spectroscopy
Abstract:
Nanostructures and nanomaterials based on peptide self-assembly have attracted tremendous interests due to the functionalities of peptide molecules. Furthermore, the self-assembled peptide nanostructures are also adopted to fabricate nanomaterials and nanodevices. In this work, the intramolecular folding and self-assembly of a β-hairpin peptide CBHH were first studied under the regulation of platinum ion. And then, platinum nanostructures were synthesized through the reduction of platinum ions templated with peptide self-assemblies. The results of circular dichroism spectroscopy, UV–vis spectroscopy, isothermal titration calorimetry, and atomic force microscopy observation showed that platinum ions could promote the conversion of peptide CBHH secondary structure from a random coil to a β-sheet through coordination with histidine residues. Platinum nanostructures including nanorods and one dimensionally aligned nanorods were synthesized through in situ reduction with CBHH self-assembled nanofiber as the templates. And the synthesized platinum nanostructures showed excellent electrocatalytic activities.
Agid:
6377111