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Controllable Biosynthesis and Properties of Gold Nanoplates Using Yeast Extract

Nano-Micro Letters 2017年第1期9卷 76-88页

作者： Zhi Yang Zhaohui Li Xuxing Lu Fengjiao He Xingzhong Zhu Yujie Ma Rong He Feng Gao Weihai Ni Yasha Yi Key Laboratory for Thin Film and Micro Fabrication of Ministry of Education Department of Micro/Nano ElectronicsSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Division of i-Lab Key Laboratory of Nano-Bio Interface and Collaborative Innovation Center of Suzhou Nano Science and TechnologySuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuPeople’s Republic of China Integrated Nano Optoelectronics Laboratory Department of Electrical and Computer EngineeringUniversity of MichiganDearbornMI 48128USA Energy Institute University of MichiganAnn ArborMI 48109USA

Biosynthesis of gold nanostructures has drawn increasing concerns because of its green and sustainable synthetic process. However, biosynthesis of gold nanoplates is still a challenge because of the expensive source and difficulties of controllable formation of morphology and size. Herein, one-pot biosynthesis of gold nanoplates is proposed, in which cheap yeast was extracted as a green precursor. The morphologies and sizes of the gold nanostructures can be controlled via varying the ph value of the biomedium. In acid condition, gold nanoplates with side length from 1300 ± 200 to 300 ± 100 nm and height from 18 to 15 nm were obtained by increasing the ph value. Whereas, in neutral or basic condition, only gold nanoflowers and nanoparticles were obtained. It was determined that organic molecules, such as succinic acid, lactic acid, malic acid, and glutathione, which are generated in metabolism process, played important role in the reduction of gold ions. Besides, it was found that the gold nanoplates exhibited plasmonic property with prominent dipole infrared resonance in near-infrared region, indicating their potential in surface plasmon-enhanced applications, such as bioimaging and photothermal therapy.

关键词： Yeast Gold nanoplates Biosynthesis ph dependent Plasmonic property

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ph-induced conformational isomerization of colicin A pore forming domain

pH-induced conformational isomerization of colicin A pore fo...

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中国化学会-生物物理化学专业委员会第四届全国生物物理化学会议

作者：黄艳樊俊鹏 LakeyJeremy 刘义武汉大学 University of Newcastle upon Tyne

Colicin A is a bacterial toxin which kills colicin-sensitive bacteria by forming a voltage-gated channel in the cytoplasmic membrane. The pore forming domain of colicin A(ColA-P) is consisting of two hydrophobic helices and eight tightly surrounded amphipathic helices. It requires acidic phospholipids in the target inner membrane to enables it to form an insertion competent state and penetrate the membrane during the voltage-gate formation process. Earlier studies have shown that ColA-p adopt a range of conformational changes depending on the ph of the solution in vitro. In this study we have characterized the near and far UV CD spectra of ColA-P at different ph. And the results show that the ph dependent molten globule state can be formed at ph 3.0 in vitro. The absence of thermal transitions of ColA-P detected by DSC at ph 3.0 also indicate that the protein need less energy to transform from its molten globule state to its unfolded stage. However, the intrinsic fluorescence spectra shown that the tryptophan residues of ColA-P are less exposure to the hydrophilic environment at low ph. This result means that the helix rotates during its molten globule state formation process and the tryptophan residues turn to the hydrophobic interface at low ph. However, the near UV CD spectra shows that the protein loses its tertiary structure at low ph. Thus, I conjectured that parts of the surrounded helices extend away from the hydrophobic core and some of the helices, such as the helices contain tryptophan residues shrink towards the hydrophobic core at low ph.

关键词： ColA-P insertion competent state molten globule state ph dependent

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