Tuning Protein Discrimination Through Altering the Sampling Interface Formed between the Analyte and the OmpG Nanopore.
Tuning Protein Discrimination Through Altering the Sampling Interface Formed between the Analyte and the OmpG Nanopore.
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通过改变分析物和OMPG纳米孔之间形成的采样界面来调整蛋白质歧视。
DOI:
10.1021/acssensors.0c02580
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发表时间:
2021-03-26
期刊:
影响因子:
8.9
通讯作者:
Chen M
中科院分区:
文献类型:
--
作者:
Fahie MA;Candido J;Andree G;Chen M
Nanopore sensors capable of distinguishing homologous protein analytes are highly desirable tools for proteomics research and disease diagnostics. Recently, an engineered outer membrane protein G (OmpG) nanopore with a high-affinity ligand attached to a gating loop 6 showed specificity for distinguishing homologous proteins in complex mixtures. Here we report the development of OmpG nanopores with the other six loops used as the anchoring point to host an affinity ligand for protein sensing. We investigated how the analyte binding to the affinity ligand located at different loops affects the detection sensitivity, selectivity and specificity. Our results reveal that analytes weakly attracted to the OmpG nanopore surface are only detectable when the ligand is tethered to loop 6. In contrast, protein analytes that form strong interaction with the OmpG surface via electrostatic attractions are distinguishable by all seven OmpG nanopore constructs. In addition, the same analyte can generate distinct binding signals with different OmpG nanopore constructs. The ability to exploit all seven OmpG loops will aid the design of a new generation of OmpG sensors with increased sensitivity, selectivity and specificity for biomarker sensing.
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DOI:
10.1073/pnas.0705466104
发表时间:
2007-10-09
影响因子:
11.1
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通讯作者:
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