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Sensors Based on Electrophysiology Measurements

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Chemical Sensors".

Deadline for manuscript submissions: closed (30 April 2021) | Viewed by 3009

Special Issue Editor


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Guest Editor
Department of Physics, Boise State University, Boise, ID, USA
Interests: Membrane Biophysics, Electrophysiology, Biosensors, Pore Forming Proteins, Single Molecule Detection and Characterization, Transmembrane Transport, Synthetic Nanopores, Kinetic Exclusion Assay, Liposomes, Controlled Drug Delivery, Microgravity

Special Issue Information

Dear Colleagues,

The past two decades have seen an exponential growth in investigations focused on developing analytical devices inspired from measurements typical to a traditional electrophysiology setups. The working principles rely on the ability to measure tiny changes in the ionic currents through a conducting pathway created in a supporting membrane upon specific or nonspecific interactions with analytes of interest. The large interest in this technology was fueled by the promise of fast and reliable DNA sequencing. However, this principle was extended for a large variety of sensing applications in which the changes in ionic currents result from analyte translocation, specific binding to biorecognition elements included into or near the conducting pathway, or conductance modulation by intrinsic or introduced regulatory mechanisms. The goal of this Special Issue is to present recent advancements in this field that employ unregulated synthetic nanopores, wild-type or modified pore-forming proteins reconstituted into bilayer lipid membranes, and natural or artificial channels that include conductance regulation mechanisms upon exposure to physical or chemical stimuli. Original research articles and reviews that address the most recent advancements in sensing approaches identical or similar to an electrophysiology setup are welcome.

Prof. Dr. Daniel Fologea
Guest Editor

Manuscript Submission Information

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Keywords

  • biosensors
  • electrophysiology
  • ion channels
  • pore forming proteins
  • regulated channels
  • synthetic nanopores
  • conducting pathways
  • patch clamp
  • macromoleculetranslocation
  • channel blockage
  • single molecule detection and characterization
  • resistive pulse technique
  • stochastic sensing
  • biorecognition

Published Papers (1 paper)

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Review

25 pages, 4815 KiB  
Review
Lysenin Channels as Sensors for Ions and Molecules
by Andrew Bogard, Gamid Abatchev, Zoe Hutchinson, Jason Ward, Pangaea W. Finn, Fulton McKinney and Daniel Fologea
Sensors 2020, 20(21), 6099; https://doi.org/10.3390/s20216099 - 27 Oct 2020
Cited by 6 | Viewed by 2611
Abstract
Lysenin is a pore-forming protein extracted from the earthworm Eisenia fetida, which inserts large conductance pores in artificial and natural lipid membranes containing sphingomyelin. Its cytolytic and hemolytic activity is rather indicative of a pore-forming toxin; however, lysenin channels present intricate regulatory [...] Read more.
Lysenin is a pore-forming protein extracted from the earthworm Eisenia fetida, which inserts large conductance pores in artificial and natural lipid membranes containing sphingomyelin. Its cytolytic and hemolytic activity is rather indicative of a pore-forming toxin; however, lysenin channels present intricate regulatory features manifested as a reduction in conductance upon exposure to multivalent ions. Lysenin pores also present a large unobstructed channel, which enables the translocation of analytes, such as short DNA and peptide molecules, driven by electrochemical gradients. These important features of lysenin channels provide opportunities for using them as sensors for a large variety of applications. In this respect, this literature review is focused on investigations aimed at the potential use of lysenin channels as analytical tools. The described explorations include interactions with multivalent inorganic and organic cations, analyses on the reversibility of such interactions, insights into the regulation mechanisms of lysenin channels, interactions with purines, stochastic sensing of peptides and DNA molecules, and evidence of molecular translocation. Lysenin channels present themselves as versatile sensing platforms that exploit either intrinsic regulatory features or the changes in ionic currents elicited when molecules thread the conducting pathway, which may be further developed into analytical tools of high specificity and sensitivity or exploited for other scientific biotechnological applications. Full article
(This article belongs to the Special Issue Sensors Based on Electrophysiology Measurements)
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