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Substrate-bound and...
Substrate-bound and substrate-free outward-facing structures of a multidrug ABC exporter
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Chaptal, Vincent (author)
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Zampieri, Veronica (author)
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- Wiseman, Benjamin (author)
- Stockholms universitet,Institutionen för biokemi och biofysik,CNRS, France; University of Lyon, France
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Orelle, Cédric (author)
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Martin, Juliette (author)
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Nguyen, Kim-Anh (author)
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Gobet, Alexia (author)
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Di Cesare, Margot (author)
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Magnard, Sandrine (author)
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Javed, Waqas (author)
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Eid, Jad (author)
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Kilburg, Arnaud (author)
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Peuchmaur, Marine (author)
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Marcoux, Julien (author)
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Monticelli, Luca (author)
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- Högbom, Martin (author)
- Stockholms universitet,Institutionen för biokemi och biofysik
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Schoehn, Guy (author)
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Jault, Jean-Michel (author)
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Boumendjel, Ahcène (author)
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Falson, Pierre (author)
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(creator_code:org_t)
- American Association for the Advancement of Science (AAAS), 2022
- 2022
- English.
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In: Science Advances. - : American Association for the Advancement of Science (AAAS). - 2375-2548. ; 8:4
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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http://kipublication...
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Abstract
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- Multidrug ABC transporters translocate drugs across membranes by a mechanism for which the molecular features of drug release are so far unknown. Here, we resolved three ATP-Mg2+-bound outward-facing conformations of the Bacillus subtilis (homodimeric) BmrA by x-ray crystallography and single-particle cryo-electron microscopy (EM) in detergent solution, one of them with rhodamine 6G (R6G), a substrate exported by BmrA when over-expressed in B. subtilis. Two R6G molecules bind to the drug-binding cavity at the level of the outer leaflet, between transmembrane (TM) helices 1-2 of one monomer and TM5'-6' of the other. They induce a rearrangement of TM1-2, highlighting a local flexibility that we confirmed by hydrogen/deuterium exchange and molecular dynamics simulations. In the absence of R6G, simulations show a fast postrelease occlusion of the cavity driven by hydrophobicity, while when present, R6G can move within the cavity, maintaining it open.
Subject headings
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Chaptal, Vincent
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Zampieri, Veroni ...
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Wiseman, Benjami ...
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Orelle, Cédric
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Martin, Juliette
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Nguyen, Kim-Anh
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show more...
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Gobet, Alexia
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Di Cesare, Margo ...
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Magnard, Sandrin ...
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Javed, Waqas
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Eid, Jad
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Kilburg, Arnaud
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Peuchmaur, Marin ...
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Marcoux, Julien
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Monticelli, Luca
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Högbom, Martin
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Schoehn, Guy
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Jault, Jean-Mich ...
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Boumendjel, Ahcè ...
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Falson, Pierre
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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Science Advances
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Stockholm University
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Karolinska Institutet