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Structure
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License: Elsevier Non-Commercial
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Article . 2015
License: Elsevier Non-Commercial
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Article . 2015 . Peer-reviewed
License: Elsevier Non-Commercial
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Article . 2016
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Molecular Mechanism of Dopamine Transport by Human Dopamine Transporter

Authors: Cheng, Mary Hongying; Bahar, Ivet;

Molecular Mechanism of Dopamine Transport by Human Dopamine Transporter

Abstract

Dopamine transporters (DATs) control neurotransmitter dopamine (DA) homeostasis by reuptake of excess DA, assisted by sodium and chloride ions. The recent resolution of DAT structure (dDAT) from Drosophila permits us for the first time to directly view the sequence of events involved in DA reuptake in human DAT (hDAT) using homology modeling and full-atomic microseconds accelerated simulations. Major observations are spontaneous closure of extracellular gates prompted by DA binding; stabilization of a holo-occluded intermediate; disruption of N82-N353 hydrogen bond and exposure to intracellular (IC) water triggered by Na2 dislocation; redistribution of a network of salt bridges at the IC surface in the inward-facing state; concerted tilting of IC-exposed helices to enable the release of Na(+) and Cl(-) ions; and DA release after protonation of D79. The observed time-resolved interactions confirm the conserved dynamics of LeuT-fold family, while providing insights into the mechanistic role of specific residues in hDAT.

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Keywords

Dopamine Plasma Membrane Transport Proteins, Binding Sites, Dopamine, Molecular Sequence Data, Molecular Docking Simulation, Structural Biology, Humans, Amino Acid Sequence, Molecular Biology, Protein Binding

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    popularity
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    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
87
Top 10%
Top 10%
Top 10%
hybrid