Covalent linkage of bacterial voltage-gated sodium channels

Sun, Huaping and Zheng, Zeyu and Fedorenko, Olena and Roberts, Stephen Kenneth (2019) Covalent linkage of bacterial voltage-gated sodium channels. BMC Biophysics, 12 (1).

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Abstract

Abstract Background: Bacterial sodium channels are important models for understanding ion permeation and selectivity. However, their homotetrameric structure limits their use as models for understanding the more complex eukaryotic voltage-gated sodium channels (which have a pseudo-heterotetrameric structure formed from an oligomer composed of four domains). To bridge this gap we attempted to synthesise oligomers made from four covalently linked bacterial sodium channel monomers and thus resembling their eukaryotic counterparts. Results: Western blot analyses revealed NaChBac oligomers to be inherently unstable whereas intact expression of NavMs oligomers was possible. Immunodectection using confocal microscopy and electrophysiological characterisation of NavMs tetramers confirmed plasma membrane localisation and equivalent functionality with wild type NavMs channels when expressed in human embryonic kidney cells. Conclusion: This study has generated new tools for the investigation of eukaryotic channels. The successful covalent linkage of four bacterial Nav channel monomers should permit the introduction of radial asymmetry into the structure of bacterial Nav channels and enable the known structures of these channels to be used to gain unique insights into structure-function relationships of their eukaryotic counterparts.

Item Type: Journal Article
Journal or Publication Title: BMC Biophysics
Departments: Faculty of Health and Medicine > Biomedical & Life Sciences
ID Code: 132768
Deposited By: ep_importer_pure
Deposited On: 11 Apr 2019 08:55
Refereed?: Yes
Published?: Published
Last Modified: 15 Sep 2019 03:33
URI: https://eprints.lancs.ac.uk/id/eprint/132768

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