Experimental Research of Protein Translocation Using Solid-state Nanopore

doi:10.6023/A17060271

Acta Chim. Sinica ›› 2017, Vol. 75 ›› Issue (11): 1121-1125.DOI: 10.6023/A17060271 Previous Articles

Special Issue: 纳米传感分析

Article

固态纳米孔对蛋白质易位的实验研究

沙菁㛃^a,b, 徐冰^a,b, 陈云飞^a,b, 杨颜菁^c,d

a 东南大学江苏省微纳生物医疗器械设计与制造重点实验室南京 211189;
b 东南大学机械工程学院南京 211189;
c 南京医科大学口腔疾病研究江苏省重点实验室南京 210029;
d 南京医科大学附属口腔医院口腔预防科南京 210029

投稿日期:2017-06-16 发布日期:2017-09-04
通讯作者: 沙菁? E-mail:major212@seu.edu.cn
基金资助:
项目受国家自然科学基金（Nos.51375092，51435003，51675101）和中央高校基本科研业务费专项资金（No.2242015R30002）资助.

Experimental Research of Protein Translocation Using Solid-state Nanopore

Sha Jingjie^a,b, Xu Bing^a,b, Chen Yunfei^a,b, Yang Yanjing^c,d

a Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189;
b School of Mechanical Engineering, Southeast University, Nanjing 211189;
c Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing 210029;
d Department of Preventive Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing 210029

Received:2017-06-16 Published:2017-09-04
Contact: 10.6023/A17060271 E-mail:major212@seu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 51375092, 51435003 and 51675101) and the Fundamental Research Funds for the Central Universities (No. 2242015R30002).

For proteins' diverse range of structural and functional features, they are important populations of biomolecules within organisms. Common methods to detect proteins are with the help of fluorescence or enzyme. Due to the advantages like lable-free and single-molecule detection, nanopore technology provides a novel platform for proteins' characterization. In this experiment, the patch clamp amplifier is used to apply the voltage and acquire the tiny current blockage. The Si₃N₄ membrane drilled with a nanopore separated the buffer solution into two sides:cis and trans. When the voltage applied into the buffer solution, charged proteins would been driven through the pore from one side to the other. Then, a series of current blockages could be obtained. By analysing these data, the size and conformation of the biomolecules could be acquired. In this paper, we using solid-state nanopore detected single protein and protein-protein complexes. The nanopore was characterized firstly. Then, both the applied voltage and the pH of the electrolyte solution were regulated. Under the low voltage, the sample proteins could be regarded as a rigid spheroid, and the dwell time is decreased with the voltage increasing. It was found that, the charges carried by proteins could be improved by higher pH of buffer solution, so that the dwell time would been shortened. Furthermore, based on the high specific between the antigen and antibody which are proteins, the translocation events before and after the addition of specific antigen into the solution with antibody were compared. Results showed that the relative current drop of the complex is larger than the pure antibody, implying that the antigen has been bound into the antibody. Due to the difference of excluded volume, the antibody and antigen-antibody complexes could be distinguished by the solid-state nanopore. In the future, the nanopore technology is promising to be applied into the recognition of multiply proteins and protein-protein interaction.

Key words: Bovine serum Albumin (BSA), antigen, antibody, solid-state nanopore, single-molecule detection

Cite this article

Sha Jingjie, Xu Bing, Chen Yunfei, Yang Yanjing. Experimental Research of Protein Translocation Using Solid-state Nanopore[J]. Acta Chim. Sinica, 2017, 75(11): 1121-1125.

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固态纳米孔对蛋白质易位的实验研究

Experimental Research of Protein Translocation Using Solid-state Nanopore

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