Single-Protein Identification by Simultaneous Size and Charge Imaging Using Evanescent Scattering Microscopy.

Single-Protein Identification by Simultaneous Size and Charge Imaging Using Evanescent Scattering Microscopy.
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DOI:
10.1021/acssensors.2c01008
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发表时间:
2022-09-23
期刊:
影响因子:
8.9
通讯作者:
Wang, Shaopeng
Wang, Shaopeng
中科院分区:
化学1区
文献类型:
--
作者:
Wan, Zijian;Ma, Guangzhong;Zhang, Pengfei;Wang, Shaopeng

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Separation and identification of different proteins is one of the most fundamental tasks in biochemistry that is typically achieved by electrophoresis and western blot. Yet, it is challenging to perform such analysis with small sample size. Using a principle analogous to these conventional approaches, we present a label-free, single-molecule technique to identify different proteins based on the difference in their size, charge, and antibody binding. We tether single protein molecules to a sensor surface with a flexible polymer and drive them into oscillation by applying an alternating electric field. By tracking the nanometer-scale oscillation of each protein molecule via a high-resolution scattering microscopy, the size and charge of each protein molecule can be determined simultaneously. Changes induced by varying the buffer pH and antibody binding are also investigated, which allows us to further expand the separation ability and identify two different proteins in a mixture. We anticipate our technique will contribute to single protein analysis and biosensing.
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