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Unidirectional Transport Mechanism in an ATP Dependent Exporter

Xu, Yanyan and Seelig, Anna and Bernèche, Simon. (2017) Unidirectional Transport Mechanism in an ATP Dependent Exporter. ACS Central Science, 3 (3). pp. 250-258.

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Abstract

ATP-binding cassette (ABC) transporters use the energy of ATP binding and hydrolysis to move a large variety of compounds across biological membranes. P-glycoprotein, involved in multidrug resistance, is the most investigated eukaryotic family member. Although a large number of biochemical and structural approaches have provided important information, the conformational dynamics underlying the coupling between ATP binding/hydrolysis and allocrite transport remains elusive. To tackle this issue, we performed molecular dynamic simulations for different nucleotide occupancy states of Sav1866, a prokaryotic P-glycoprotein homologue. The simulations reveal an outward-closed conformation of the transmembrane domain that is stabilized by the binding of two ATP molecules. The hydrolysis of a single ATP leads the X-loop, a key motif of the ATP binding cassette, to interfere with the transmembrane domain and favor its outward-open conformation. Our findings provide a structural basis for the unidirectionality of transport in ABC exporters and suggest a ratio of one ATP hydrolyzed per transport cycle.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Biophysical Chemistry (Seelig A)
UniBasel Contributors:Seelig-Löffler, Anna
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
ISSN:2374-7943
e-ISSN:2374-7951
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:20 Oct 2017 06:26
Deposited On:02 Oct 2017 12:40

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