Enzymatically enhanced collisions on ultramicroelectrodes for specific and rapid detection of individual viruses
- 23 May 2016
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 113 (23), 6403-6408
- https://doi.org/10.1073/pnas.1605002113
Abstract
We report the specific collision of a single murine cytomegalovirus (MCMV) on a platinum ultramicroelectrode (UME, radius of 1 μm). Antibody directed against the viral surface protein glycoprotein B functionalized with glucose oxidase (GOx) allowed for specific detection of the virus in solution and a biological sample (urine). The oxidation of ferrocene methanol to ferrocenium methanol was carried out at the electrode surface, and the ferrocenium methanol acted as the cosubstrate to GOx to catalyze the oxidation of glucose to gluconolactone. In the presence of glucose, the incident collision of a GOx-covered virus onto the UME while ferrocene methanol was being oxidized produced stepwise increases in current as observed by amperometry. These current increases were observed due to the feedback loop of ferrocene methanol to the surface of the electrode after GOx reduces ferrocenium methanol back to ferrocene. Negative controls (i) without glucose, (ii) with an irrelevant virus (murine gammaherpesvirus 68), and (iii) without either virus do not display these current increases. Stepwise current decreases were observed for the prior two negative controls and no discrete events were observed for the latter. We further apply this method to the detection of MCMV in urine of infected mice. The method provides for a selective, rapid, and sensitive detection technique based on electrochemical collisions.Keywords
Funding Information
- NSF (CHE- 1405248)
- Welch Foundation (F-0021)
- NSF Graduate Research Fellowship (DGE-1110007)
- Cancer Prevention Research Institute of Texas (R1202)
This publication has 23 references indexed in Scilit:
- Monitoring the Electrophoretic Migration and Adsorption of Single Insulating Nanoparticles at UltramicroelectrodesThe Journal of Physical Chemistry B, 2012
- DAI/ZBP1/DLM-1 Complexes with RIP3 to Mediate Virus-Induced Programmed Necrosis that Is Targeted by Murine Cytomegalovirus vIRACell Host & Microbe, 2012
- Stochastic electrochemistry with electrocatalytic nanoparticles at inert ultramicroelectrodes—theory and experimentsPhysical Chemistry Chemical Physics, 2011
- Electrochemistry of Single Nanoparticles via Electrocatalytic AmplificationIsrael Journal of Chemistry, 2010
- Electrochemical Glucose Sensors and Their Applications in Diabetes ManagementChemical Reviews, 2008
- Observing Single Nanoparticle Collisions at an Ultramicroelectrode by Electrocatalytic AmplificationJournal of the American Chemical Society, 2007
- Time-Resolved Electrochemical Detection of Discrete Adsorption EventsJournal of the American Chemical Society, 2004
- Antigens and immunoevasins: opponents in cytomegalovirus immune surveillanceNature Reviews Immunology, 2002
- A fully active monolayer enzyme electrode derivatized by antigen-antibody attachmentJournal of the American Chemical Society, 1993
- New insights into the enzymic catalysis of the oxidation of glucose by native and recombinant glucose oxidase mediated by electrochemically generated one-electron redox cosubstrates.Journal of the American Chemical Society, 1993