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Membrane mediated toppling mechanism of the folate energy coupling factor transporter

Faustino, I., Abdizadeh, H., Souza, P. C. T., Jeucken, A., Stanek, W. K., Guskov, A., Slotboom, D. & Marrink, S., 9-Apr-2020, In : Nature Communications. 11, 1763.

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Energy coupling factor (ECF) transporters are responsible for the uptake of micronutrients in bacteria and archaea. They consist of an integral membrane unit, the S-component, and a tripartite ECF module. It has been proposed that the S-component mediates the substrate transport by toppling over in the membrane when docking onto an ECF module. Here, we present multi-scale molecular dynamics simulations and in vitro experiments to study the molecular toppling mechanism of the S-component of a folate-specific ECF transporter. Simulations reveal a strong bending of the membrane around the ECF module that provides a driving force for toppling of the S-component. The stability of the toppled state depends on the presence of non-bilayer forming lipids, as confirmed by folate transport activity mea- surements. Together, our data provide evidence for a lipid-dependent toppling-based mechanism for the folate-specific ECF transporter, a mechanism that might apply to other ECF transporters.
Original languageEnglish
Article number1763
JournalNature Communications
Volume11
Publication statusPublished - 9-Apr-2020

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