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Issue 40, 2018
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Dielectric constant of flagellin proteins measured by scanning dielectric microscopy

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Abstract

The dielectric constant of flagellin proteins in flagellar bacterial filaments ∼10–20 nm in diameter is measured using scanning dielectric microscopy. We obtained for two different bacterial species (Shewanella oneidensis MR-1 and Pseudomonas aeruginosa PAO1) similar relative dielectric constant values εSo = 4.3 ± 0.6 and εPa = 4.5 ± 0.7, respectively, despite their different structure and amino acid sequence. The present results show the applicability of scanning dielectric microscopy to nanoscale filamentous protein complexes and to general 3D macromolecular protein geometries, thus opening new avenues to study the relationship between the dielectric response and protein structure and function.

Graphical abstract: Dielectric constant of flagellin proteins measured by scanning dielectric microscopy

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Supplementary files

Article information


Submitted
01 Aug 2018
Accepted
15 Sep 2018
First published
17 Sep 2018

Nanoscale, 2018,10, 19188-19194
Article type
Paper

Dielectric constant of flagellin proteins measured by scanning dielectric microscopy

H. Lozano, R. Fabregas, N. Blanco-Cabra, R. Millán-Solsona, E. Torrents, L. Fumagalli and G. Gomila, Nanoscale, 2018, 10, 19188
DOI: 10.1039/C8NR06190D

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