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• W2796438278 abstract "Selectivity and sensitivity are two key parameters utilized to describe the performance of a sensor. In order to investigate selectivity and sensitivity of the aerolysin nanosensor, we manipulated its surface charge at different locations via single site-directed mutagenesis. To study the selectivity, we replaced the positively charged R220 at the entrance of the pore with negatively charged glutamic acid, resulting in barely no current blockages for sensing negatively charged oligonucleotides. For the sensitivity, we substituted the positively charged lumen-exposed amino acid K238 located at trans-ward third of the β-barrel stem with glutamic acid. This leads to a surprisingly longer duration time at +140 mV, which is about 20 times slower in translocation speed for Poly(dA)4 compared to that of wild-type aerolysin, indicating the stronger pore-analyte interactions and enhanced sensitivity. Therefore, it is both feasible and understandable to rationally design confined biological nanosensors for single molecule detection with high selectivity and sensitivity." @default.
• W2796438278 created "2018-04-13" @default.
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• W2796438278 date "2018-04-05" @default.
• W2796438278 modified "2023-10-14" @default.
• W2796438278 title "Rationally Designed Sensing Selectivity and Sensitivity of an Aerolysin Nanopore via Site-Directed Mutagenesis" @default.
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• W2796438278 doi "https://doi.org/10.1021/acssensors.8b00021" @default.
• W2796438278 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29619834" @default.
• W2796438278 hasPublicationYear "2018" @default.
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