Conformational and dynamic plasticity in substrate-binding proteins underlies selective transport in ABC importers
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Date
2019
Authors
De Boer, M.
Gouridis, G.
Vietrov, R.
Begg, S.L.
Schuurman-Wolters, G.K.
Husada, F.
Eleftheriadis, N.
Poolman, B.
McDevitt, C.A.
Cordes, T.
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Journal article
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eLife, 2019; 8:e44652-1-e44652-28
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Marijn de Boer, Giorgos Gouridis, Ruslan Vietrov, Stephanie L Begg,
Gea K Schuurman-Wolters, Florence Husada, Nikolaos Eleftheriadis,
Bert Poolman, Christopher A McDevitt, Thorben Cordes
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Abstract
Substrate-binding proteins (SBPs) are associated with ATP-binding cassette importers and switch from an open to a closed conformation upon substrate binding, providing specificity for transport. We investigated the effect of substrates on the conformational dynamics of six SBPs and the impact on transport. Using single-molecule FRET, we reveal an unrecognized diversity of plasticity in SBPs. We show that a unique closed SBP conformation does not exist for transported substrates. Instead, SBPs sample a range of conformations that activate transport. Certain non-transported ligands leave the structure largely unaltered or trigger a conformation distinct from that of transported substrates. Intriguingly, in some cases, similar SBP conformations are formed by both transported and non-transported ligands. In this case, the inability for transport arises from slow opening of the SBP or the selectivity provided by the translocator. Our results reveal the complex interplay between ligand-SBP interactions, SBP conformational dynamics and substrate transport.
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© Copyright de Boer et al. This article is distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use and redistribution provided that the original author and source are credited.