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Martín-González N, Guérin Darvas SM, Durana A, Marti GA, Guérin DMA, de Pablo PJ. Exploring the role of genome and structural ions in preventing viral capsid collapse during dehydration. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:104001. [PMID: 29350623 PMCID: PMC7104708 DOI: 10.1088/1361-648x/aaa944] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 01/12/2018] [Accepted: 01/19/2018] [Indexed: 06/07/2023]
Abstract
Even though viruses evolve mainly in liquid milieu, their horizontal transmission routes often include episodes of dry environment. Along their life cycle, some insect viruses, such as viruses from the Dicistroviridae family, withstand dehydrated conditions with presently unknown consequences to their structural stability. Here, we use atomic force microscopy to monitor the structural changes of viral particles of Triatoma virus (TrV) after desiccation. Our results demonstrate that TrV capsids preserve their genome inside, conserving their height after exposure to dehydrating conditions, which is in stark contrast with other viruses that expel their genome when desiccated. Moreover, empty capsids (without genome) resulted in collapsed particles after desiccation. We also explored the role of structural ions in the dehydration process of the virions (capsid containing genome) by chelating the accessible cations from the external solvent milieu. We observed that ion suppression helps to keep the virus height upon desiccation. Our results show that under drying conditions, the genome of TrV prevents the capsid from collapsing during dehydration, while the structural ions are responsible for promoting solvent exchange through the virion wall.
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Affiliation(s)
- Natalia Martín-González
- Departamento de Física de la Materia Condensada C-III and Instituto de Física de la Materia Condensada (IFIMAC), Universidad Autónoma de Madrid, Cantoblanco 28049 Madrid, Spain
| | - Sofía M Guérin Darvas
- Department of Biochemistry and Molecular Biology, University of the Basque Country (UPV/EHU), Barrio Sarriena S/N, 48940, Leioa, Vizcaya, Spain
| | - Aritz Durana
- Instituto Biofisika (IBF, UPV/EHU, CSIC), Parque Científico de la UPV/EHU, Barrio Sarriena S/N, 48940, Leioa, Vizcaya, Spain
- Fundación Biofísica Bizkaia, Edificio Biblioteca Central UPV/EHU, Bº Sarriena S/N, 48940, Leioa, Vizcaya, Spain
| | - Gerardo A Marti
- Centro de Estudios Parasitológicos y de Vectores (CEPAVE-CCT-La Plata-CONICET-UNLP), Boulevard 120 e/61 y 62, 1900 La Plata, Argentina
| | - Diego M A Guérin
- Department of Biochemistry and Molecular Biology, University of the Basque Country (UPV/EHU), Barrio Sarriena S/N, 48940, Leioa, Vizcaya, Spain
- Instituto Biofisika (IBF, UPV/EHU, CSIC), Parque Científico de la UPV/EHU, Barrio Sarriena S/N, 48940, Leioa, Vizcaya, Spain
| | - Pedro J de Pablo
- Departamento de Física de la Materia Condensada C-III and Instituto de Física de la Materia Condensada (IFIMAC), Universidad Autónoma de Madrid, Cantoblanco 28049 Madrid, Spain
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Douas M, Marqués MI, Serena PA. Optical image contrast enhancement in near-field optics induced by water condensation. Ultramicroscopy 2013; 135:50-5. [DOI: 10.1016/j.ultramic.2013.05.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 05/31/2013] [Accepted: 05/31/2013] [Indexed: 10/26/2022]
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Douas M, Marqués MI, Serena PA. Identification of water content in nanocavities. NANOSCALE RESEARCH LETTERS 2013; 8:171. [PMID: 23587406 PMCID: PMC3673901 DOI: 10.1186/1556-276x-8-171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 04/01/2013] [Indexed: 06/02/2023]
Abstract
: A tapered dielectric waveguide that scans, at constant height, a sample containing a viral capsid is studied by combining a lattice gas model to simulate water meniscus formation and a finite difference time domain algorithm for light propagation through the media involved. Our results show different contrasts related to different water contents and different meniscus orientations. We propose this method as a way to study water content and evaporation process in nanocavities being either biological, like viral capsides, or nonbiological, like photonic crystals.
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Affiliation(s)
- Maysoun Douas
- Departamento de Física de Materiales C-04, Universidad Autónoma de Madrid, Madrid 28049, Spain
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Madrid 28049, Spain
| | - Manuel I Marqués
- Departamento de Física de Materiales C-04, Universidad Autónoma de Madrid, Madrid 28049, Spain
- Instituto de Ciencia de Materiales ‘Nicolás Cabrera’, Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Pedro A Serena
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Madrid 28049, Spain
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Mateu MG. Mechanical properties of viruses analyzed by atomic force microscopy: A virological perspective. Virus Res 2012; 168:1-22. [DOI: 10.1016/j.virusres.2012.06.008] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Revised: 06/05/2012] [Accepted: 06/05/2012] [Indexed: 10/28/2022]
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