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Plasma membrane dynamics and tetrameric organisation of ABCG2 transporters in mammalian cells revealed by single particle imaging techniques

Wong, Kelvin; Briddon, Stephen J.; Holliday, Nicholas D.; Kerr, Ian D.

Authors

Kelvin Wong

IAN KERR ian.kerr@nottingham.ac.uk
Associate Professor



Abstract

ABCG2 is one of three human ATP binding cassette (ABC) transporters involved in the export from cells of a chemically and structurally diverse range of compounds. This multidrug efflux capability, together with a broad tissue distribution in the body, means that ABCG2 exerts a range of effects on normal physiology such as kidney urate transport, as well as contributing towards the pharmacokinetic profiles of many exogenous drugs. The primary sequence of ABCG2 contains only half the number of domains required for a functioning ABC transporter and so it must oligomerise in order to function, yet its oligomeric state in intact cell membranes remains uncharacterized. We have analysed ABCG2 in living cell membranes using a combination of fluorescence correlation spectroscopy, photon counting histogram analysis, and stepwise photobleaching to demonstrate a predominantly tetrameric structure for ABCG2 in the presence or absence of transport substrates. These results provide the essential basis for exploring pharmacological manipulation of oligomeric state as a strategy to modulate ABCG2 activity in future selective therapeutics.

Journal Article Type Article
Publication Date 2016-01
Journal Biochimica et Biophysica Acta (BBA) - Molecular Cell Research
Print ISSN 0167-4889
Electronic ISSN 0006-3002
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 1863
Issue 1
Pages 19-29
APA6 Citation Wong, K., Briddon, S. J., Holliday, N. D., & Kerr, I. D. (2016). Plasma membrane dynamics and tetrameric organisation of ABCG2 transporters in mammalian cells revealed by single particle imaging techniques. Biochimica et Biophysica Acta (BBA) - Molecular Cell Research, 1863(1), 19-29. https://doi.org/10.1016/j.bbamcr.2015.10.002
DOI https://doi.org/10.1016/j.bbamcr.2015.10.002
Keywords Oligomerisation, Fluorescence correlation spectroscopy,
ABCG2, Photon counting histogram, Total internal reflection fluorescence, Stepwise photobleaching
Publisher URL http://www.sciencedirect.com/science/article/pii/S0167488915003493
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0
Additional Information This article is maintained by: Elsevier; Article Title: Plasma membrane dynamics and tetrameric organisation of ABCG2 transporters in mammalian cells revealed by single particle imaging techniques; Journal Title: Biochimica et Biophysica Acta (BBA) - Molecular Cell Research; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.bbamcr.2015.10.002; Content Type: article; Copyright: Copyright © 2015 Elsevier B.V. All rights reserved.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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