Imperial College London
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Professor Joshua B. Edel

Faculty of Natural Sciences, Department of Chemistry

Professor of Biosensing & Analytical Sciences
 
 
 
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Contact

 

+44 (0)20 7594 0754joshua.edel Website

 
 
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Assistant

 

Mr John Murrell +44 (0)20 7594 2845

 
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Location

 

110cMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Freedman:2014:10.1021/nn5062645,
author = {Freedman, KJ and Haq, SR and Fletcher, MR and Foley, JP and Jemth, P and Edel, JB and Kim, MJ},
doi = {10.1021/nn5062645},
journal = {ACS Nano},
pages = {12238--12249},
title = {Nonequilibrium Capture Rates Induce Protein Accumulation and Enhanced Adsorption to Solid-State Nanopores},
url = {http://dx.doi.org/10.1021/nn5062645},
volume = {8},
year = {2014}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Single molecule capturing of analytes using an electrically biased nanopore is the fundamental mechanism in which nearly all nanopore experiments are conducted. With pore dimensions being on the order of a single molecule, the spatial zone of sensing only contains approximately a zeptoliter of volume. As a result, nanopores offer high precision sensing within the pore but provide little to no information about the analytes outside the pore. In this study, we use capture frequency and rate balance theory to predict and study the accumulation of proteins at the entrance to the pore. Protein accumulation is found to have positive attributes such as capture rate enhancement over time but can additionally lead to negative effects such as long-term blockages typically attributed to protein adsorption on the surface of the pore. Working with the folded and unfolded states of the protein domain PDZ2 from SAP97, we show that applying short (e.g., 3–25 s in duration) positive voltage pulses, rather than a constant voltage, can prevent long-term current blockades (i.e., adsorption events). By showing that the concentration of proteins around the pore can be controlled in real time using modified voltage protocols, new experiments can be explored which study the role of concentration on single molecular kinetics including protein aggregation, folding, and protein binding.
AU  - Freedman,KJ
AU  - Haq,SR
AU  - Fletcher,MR
AU  - Foley,JP
AU  - Jemth,P
AU  - Edel,JB
AU  - Kim,MJ
DO  - 10.1021/nn5062645
EP  - 12249
PY  - 2014///
SN  - 1936-086X
SP  - 12238
TI  - Nonequilibrium Capture Rates Induce Protein Accumulation and Enhanced Adsorption to Solid-State Nanopores
T2  - ACS Nano
UR  - http://dx.doi.org/10.1021/nn5062645
UR  - http://pubs.acs.org/doi/abs/10.1021/nn5062645
UR  - http://hdl.handle.net/10044/1/23848
VL  - 8
ER  -
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