Abstract
Atomic force microscopy employs a nanometric tip located at the end of a micro-cantilever to probe surface-mounted samples at nanometer resolution. Because the technique can also work in a liquid environment it offers unique possibilities to study individual viruses under conditions that mimic their natural milieu. Here, we review how AFM imaging can be used to study the surface structure of viruses including that of viruses lacking a well-defined symmetry. Beyond imaging, AFM enables the manipulation of single viruses by force spectroscopy experiments. Pulling experiments can provide information about the early events of virus–host interaction between the viral fibers and the cell membrane receptors. Pushing experiments measure the mechanical response of the viral capsid and its contents and can be used to show how virus maturation and exposure to different pH values change the mechanical response of the viruses and the interaction between the capsid and genome. Finally, we discuss how studying capsid rupture and self-healing events offers insight in virus uncoating pathways.
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Abbreviations
- AFM:
-
Atomic Force Microscopy
- Fl:
-
Lateral Force
- Fn:
-
Normal Force
- FZ:
-
Force vs. Distance
- HAdV:
-
human Adenovirus
- HIV:
-
Human Immunodeficiency Virus
- HOPG:
-
Highly Oriented Pyrolytic Graphite
- JM:
-
Jumping Mode
- nN:
-
nanoNewton
- pN:
-
picoNewton
- TIRFM:
-
Total Internal Reflection Fluorescence Microscopy
- TMV:
-
Tobacco Mosaic Virus
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Acknowledgements
We acknowledge our students, former students, collaborators, and projects FIS2014-59562-R, FIS2015-71108-REDT, FIS2017-89549-R. Fundación BBVA and “María de Maeztu” Program for Units of Excellence in R&D (MDM-2014-0377).
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de Pablo, P.J., Schaap, I.A.T. (2019). Atomic Force Microscopy of Viruses. In: Greber, U. (eds) Physical Virology. Advances in Experimental Medicine and Biology, vol 1215. Springer, Cham. https://doi.org/10.1007/978-3-030-14741-9_8
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