Examining the stability of membrane proteins within SMALPs


Amphipathic co-polymers such as styrene-maleic acid (SMA) have gained popularity over the last few years due to their ability and ease of use in solubilising and purifying membrane proteins in comparison to conventional methods of extraction such as detergents. SMA2000 is widely used for membrane protein studies and is considered as the optimal polymer for this technique. In this study a side-by-side comparison of SMA2000 with the polymer SZ30010 was carried out as both these polymers have similar styrene:maleic acid ratios and average molecular weights. Ability to solubilise, purify and stabilise membrane proteins was tested using three structurally different membrane proteins. Our results show that both polymers can be used to extract membrane proteins at a comparable efficiency to conventional detergent dodecylmaltoside (DDM). SZ30010 was found to give a similar protein yield and, SMALP disc size as SMA2000, and both polymers offered an increased purity and increased thermostability compared to DDM. Further investigation was conducted to investigate SMALP sensitivity to divalent cations. It was found that the sensitivity is polymer specific and not dependent on the protein encapsulated. Neither is it affected by the concentration of SMALPs. Larger divalent cations such as Co2+ and Zn2+ resulted in an increased sensitivity.

Publication DOI: https://doi.org/10.1016/j.eurpolymj.2018.12.008
Dataset DOI: https://doi.org/10.17036/researchdata.aston.ac.uk.00000360
Divisions: College of Health & Life Sciences > School of Biosciences
College of Health & Life Sciences
College of Health & Life Sciences > School of Biosciences > Cellular and Molecular Biomedicine
Additional Information: © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: Detergent,Divalent cation,Membrane protein,SMALP,Styrene-maleic acid co-polymer,Thermostability,Physics and Astronomy(all),Organic Chemistry,Polymers and Plastics,Materials Chemistry
Publication ISSN: 1873-1945
Last Modified: 10 May 2024 07:13
Date Deposited: 19 Dec 2018 10:50
Full Text Link:
Related URLs: https://linking ... 014305718311832 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2019-03-01
Published Online Date: 2018-12-06
Accepted Date: 2018-12-05
Authors: Gulamhussein, Aiman A.
Meah, Danyall
Soja, Damian D.
Fenner, Stephen
Saidani, Zakaria
Akram, Aneel
Lallie, Simran
Mathews, Ashlyn
Painter, Culum
Liddar, Monique K.
Mohammed, Zain
Ki Chiu, Lai
Sumar, Sabiha S.
Healy, Hannah
Hussain, Nabeel
Patel, Jaimin H.
Hall, Stephen C.l.
Dafforn, Timothy R.
Rothnie, Alice J. (ORCID Profile 0000-0002-4259-7015)

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