Cycloalkane-modified amphiphilic polymers provide direct extraction of membrane proteins for CryoEM analysis

Abstract

Membrane proteins are essential for cellular growth, signalling and homeostasis, making up a large proportion of therapeutic targets. However, the necessity for a solubilising agent to extract them from the membrane creates challenges in their structural and functional study. Although amphipols have been very effective for single-particle electron cryo-microscopy (cryoEM) and mass spectrometry, they rely on initial detergent extraction before exchange into the amphipol environment. Therefore, circumventing this pre-requirement would be a big advantage. Here we use an alternative type of amphipol: a cycloalkane-modified amphiphile polymer (CyclAPol) to extract Escherichia coli AcrB directly from the membrane and demonstrate that the protein can be isolated in a one-step purification with the resultant cryoEM structure achieving 3.2 Å resolution. Together this work shows that cycloalkane amphipols provide a powerful approach for the study of membrane proteins, allowing native extraction and high-resolution structure determination by cryoEM.

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Item Type:	Article
Authors/Creators:	Higgins, AJ Flynn, AJ Marconnet, A Musgrove, LJ Postis, VLG https://orcid.org/0000-0001-9251-4567 Lippiat, JD https://orcid.org/0000-0003-3748-7345 Chung, C Ceska, T Zoonens, M Sobott, F https://orcid.org/0000-0001-9029-1865 Muench, SP https://orcid.org/0000-0001-6869-4414
Copyright, Publisher and Additional Information:	© The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Published: 25 November 2021 Published (online): 25 November 2021 Accepted: 27 October 2021
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Biomedical Sciences (Leeds) The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Molecular and Cellular Biology (Leeds)
Funding Information:	Funder Grant number BBSRC (Biotechnology & Biological Sciences Research Council) BB/R018561/1
Depositing User:	Symplectic Publications
Date Deposited:	28 Oct 2021 13:14
Last Modified:	25 Jun 2023 22:48
Status:	Published
Publisher:	Nature Research
Identification Number:	10.1038/s42003-021-02834-3
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:179721

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Cycloalkane-modified amphiphilic polymers provide direct extraction of membrane proteins for CryoEM analysis

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