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Integrating mass spectrometry with MD simulations reveals the role of lipids in Na(+)/H(+) antiporters

Na(+)/H(+) antiporters are found in all kingdoms of life and exhibit catalysis rates that are among the fastest of all known secondary-active transporters. Here we combine ion mobility mass spectrometry and molecular dynamics simulations to study the conformational stability and lipid-binding proper...

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Autores principales: Landreh, Michael, Marklund, Erik G., Uzdavinys, Povilas, Degiacomi, Matteo T., Coincon, Mathieu, Gault, Joseph, Gupta, Kallol, Liko, Idlir, Benesch, Justin L. P., Drew, David, Robinson, Carol V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5234078/
https://www.ncbi.nlm.nih.gov/pubmed/28071645
http://dx.doi.org/10.1038/ncomms13993
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author Landreh, Michael
Marklund, Erik G.
Uzdavinys, Povilas
Degiacomi, Matteo T.
Coincon, Mathieu
Gault, Joseph
Gupta, Kallol
Liko, Idlir
Benesch, Justin L. P.
Drew, David
Robinson, Carol V.
author_facet Landreh, Michael
Marklund, Erik G.
Uzdavinys, Povilas
Degiacomi, Matteo T.
Coincon, Mathieu
Gault, Joseph
Gupta, Kallol
Liko, Idlir
Benesch, Justin L. P.
Drew, David
Robinson, Carol V.
author_sort Landreh, Michael
collection PubMed
description Na(+)/H(+) antiporters are found in all kingdoms of life and exhibit catalysis rates that are among the fastest of all known secondary-active transporters. Here we combine ion mobility mass spectrometry and molecular dynamics simulations to study the conformational stability and lipid-binding properties of the Na(+)/H(+) exchanger NapA from Thermus thermophilus and compare this to the prototypical antiporter NhaA from Escherichia coli and the human homologue NHA2. We find that NapA and NHA2, but not NhaA, form stable dimers and do not selectively retain membrane lipids. By comparing wild-type NapA with engineered variants, we show that the unfolding of the protein in the gas phase involves the disruption of inter-domain contacts. Lipids around the domain interface protect the native fold in the gas phase by mediating contacts between the mobile protein segments. We speculate that elevator-type antiporters such as NapA, and likely NHA2, use a subset of annular lipids as structural support to facilitate large-scale conformational changes within the membrane.
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spelling pubmed-52340782017-01-24 Integrating mass spectrometry with MD simulations reveals the role of lipids in Na(+)/H(+) antiporters Landreh, Michael Marklund, Erik G. Uzdavinys, Povilas Degiacomi, Matteo T. Coincon, Mathieu Gault, Joseph Gupta, Kallol Liko, Idlir Benesch, Justin L. P. Drew, David Robinson, Carol V. Nat Commun Article Na(+)/H(+) antiporters are found in all kingdoms of life and exhibit catalysis rates that are among the fastest of all known secondary-active transporters. Here we combine ion mobility mass spectrometry and molecular dynamics simulations to study the conformational stability and lipid-binding properties of the Na(+)/H(+) exchanger NapA from Thermus thermophilus and compare this to the prototypical antiporter NhaA from Escherichia coli and the human homologue NHA2. We find that NapA and NHA2, but not NhaA, form stable dimers and do not selectively retain membrane lipids. By comparing wild-type NapA with engineered variants, we show that the unfolding of the protein in the gas phase involves the disruption of inter-domain contacts. Lipids around the domain interface protect the native fold in the gas phase by mediating contacts between the mobile protein segments. We speculate that elevator-type antiporters such as NapA, and likely NHA2, use a subset of annular lipids as structural support to facilitate large-scale conformational changes within the membrane. Nature Publishing Group 2017-01-10 /pmc/articles/PMC5234078/ /pubmed/28071645 http://dx.doi.org/10.1038/ncomms13993 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Landreh, Michael
Marklund, Erik G.
Uzdavinys, Povilas
Degiacomi, Matteo T.
Coincon, Mathieu
Gault, Joseph
Gupta, Kallol
Liko, Idlir
Benesch, Justin L. P.
Drew, David
Robinson, Carol V.
Integrating mass spectrometry with MD simulations reveals the role of lipids in Na(+)/H(+) antiporters
title Integrating mass spectrometry with MD simulations reveals the role of lipids in Na(+)/H(+) antiporters
title_full Integrating mass spectrometry with MD simulations reveals the role of lipids in Na(+)/H(+) antiporters
title_fullStr Integrating mass spectrometry with MD simulations reveals the role of lipids in Na(+)/H(+) antiporters
title_full_unstemmed Integrating mass spectrometry with MD simulations reveals the role of lipids in Na(+)/H(+) antiporters
title_short Integrating mass spectrometry with MD simulations reveals the role of lipids in Na(+)/H(+) antiporters
title_sort integrating mass spectrometry with md simulations reveals the role of lipids in na(+)/h(+) antiporters
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5234078/
https://www.ncbi.nlm.nih.gov/pubmed/28071645
http://dx.doi.org/10.1038/ncomms13993
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