Citation: Li Mengyin, Ying Yilun, Long Yi-Tao. Unveiling the Synergistic Effect from Key Sensing Regions in Aerolysin-Based Single Oligonucleotide Detection[J]. Acta Chimica Sinica, ;2019, 77(10): 984-988. doi: 10.6023/A19060202 shu

Unveiling the Synergistic Effect from Key Sensing Regions in Aerolysin-Based Single Oligonucleotide Detection

Li Mengyin ^a ,
Ying Yilun ^a,b ,
Long Yi-Tao ^a,b,,

a.
School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237
b.
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023

Corresponding author: Long Yi-Tao, yitaolong@nju.edu.cn
Received Date: 8 June 2019
Available Online: 11 October 2019
Fund Project: the National Natural Science Foundation of China 61871183Project supported by the National Natural Science Foundation of China (Nos. 21834001, 61871183)the National Natural Science Foundation of China 21834001

Figures(5)

Nanopore technology are being developed for large areas in life science, not only in DNA sequencing and protein sequencing, but also in biomolecule detection, bio-interaction measurement and drug screening. Aerolysin is regarded as new powerful tool for oligonucleotide sensing and peptide sensing due to its high charged pore lumen. Applied a transmembrane potential with a pair of Ag/AgCl electrodes, the negatively charged oligonucleotides are driven into the aerolysin nanopore, inducing a series of ionic current blockages, which could distinguish the oligonucleotides with different length or single base variation. However, due to the lack of high-resolution structure of aerolysin nanopore, the mechanism of its high sensing capability is not clear, limiting the further applications of aerolysin. Recently, we presented two sensing regions inside aerolysin, R1 (near R220) and R2 (near K238), having huge influences on oligonucleotide sensing. Especially, the R1 is responsible for distinguished all 4 bases and 2 modified based in the mixture. However, the detailed mechanism of synergistic effect for these two regions in detection of single nucleotides is still unclear. Here, we use dA₁₄-4-X, dA₁₄-11-X, dA₁₄-4-X-11-X (X=C, T, G) as probes to investigate the effects of base types on the sensing ability of R1 and R2. The results show that the A, C or T in R2 region did not change the sensing ability of R1 region, while G in R2 would hinder the base discrimination in R1 region. This may be caused by the large volume of G that would nearly fully occupy the R2 region and the stronger non-covalent interaction between G and R2 region, resulting in determining the residual current of the whole nanopore. Moreover, we evaluated the interaction between different bases with the sensing region. The results show that the interaction is independent with the volume of the bases, which is ordered by A > G > C > T, suggesting the interaction inside the aerolysin lumen is a considerable factor for its sensing capability. These results would guide us to directly design the mutant Aerolysin nanopore that aims for DNA sequencing and peptide sequencing.
- nanopore,
- single-molecule interface,
- electro confinement,
- aerolysin,
- oligonucleotide
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