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Lagunas A, Belloir C, Briand L, Gorostiza P, Samitier J. Determination of the nanoscale electrical properties of olfactory receptor hOR1A1 and their dependence on ligand binding: Towards the development of capacitance-operated odorant biosensors. Biosens Bioelectron 2022; 218:114755. [PMID: 36191583 DOI: 10.1016/j.bios.2022.114755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 09/09/2022] [Accepted: 09/23/2022] [Indexed: 12/30/2022]
Abstract
The transduction of odorant binding into cellular signaling by olfactory receptors (ORs) is not understood and knowing its mechanism would enable developing new pharmacology and biohybrid electronic detectors of volatile organic compounds bearing high sensitivity and selectivity. The electrical characterization of ORs in bulk experiments is subject to microscopic models and assumptions. We have directly determined the nanoscale electrical properties of ORs immobilized in a fixed orientation, and their change upon odorant binding, using electrochemical scanning tunneling microscopy (EC-STM) in near-physiological conditions. Recordings of current versus time, distance, and electrochemical potential allows determining the OR impedance parameters and their dependence with odorant binding. Our results allow validating OR structural-electrostatic models and their functional activation processes, and anticipating a novel macroscopic biosensor based on ORs.
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Affiliation(s)
- Anna Lagunas
- Biomedical Research Networking Center in Bioengineering, Biomaterials, and Nanomedicine (CIBER-BBN), av. Monforte de Lemos, 3-5. Pabellón 11. Planta 0, 28029, Madrid, Spain; Institute for Bioengineering of Catalonia (IBEC), Barcelona Institute of Science and Technology, c/Baldiri i Reixac 10-12, 08028, Barcelona, Spain.
| | - Christine Belloir
- Centre des Sciences du Goût et de l'Alimentation, CNRS, INRAE, Institut Agro Dijon, Université Bourgogne Franche-Comté, 9E Bd Jeanne d'Arc, 21000, Dijon, France
| | - Loïc Briand
- Centre des Sciences du Goût et de l'Alimentation, CNRS, INRAE, Institut Agro Dijon, Université Bourgogne Franche-Comté, 9E Bd Jeanne d'Arc, 21000, Dijon, France
| | - Pau Gorostiza
- Biomedical Research Networking Center in Bioengineering, Biomaterials, and Nanomedicine (CIBER-BBN), av. Monforte de Lemos, 3-5. Pabellón 11. Planta 0, 28029, Madrid, Spain; Institute for Bioengineering of Catalonia (IBEC), Barcelona Institute of Science and Technology, c/Baldiri i Reixac 10-12, 08028, Barcelona, Spain; Catalan Institution for Research and Advanced Studies (ICREA), pg. Lluís Companys 23, Barcelona, 08010, Spain
| | - Josep Samitier
- Biomedical Research Networking Center in Bioengineering, Biomaterials, and Nanomedicine (CIBER-BBN), av. Monforte de Lemos, 3-5. Pabellón 11. Planta 0, 28029, Madrid, Spain; Institute for Bioengineering of Catalonia (IBEC), Barcelona Institute of Science and Technology, c/Baldiri i Reixac 10-12, 08028, Barcelona, Spain; Department of Electronics and Biomedical Engineering, Faculty of Physics, University of Barcelona (UB), c/Martí i Franquès 1, 08028, Barcelona, Spain.
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