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@ARTICLE{Kortzak:865082,
author = {Kortzak, Daniel and Alleva, Claudia and Weyand, Ingo and
Ewers, David and Zimmermann, Meike I and Franzen, Arne and
Machtens, Jan‐Philipp and Fahlke, Christoph},
title = {{A}llosteric gate modulation confers {K} + coupling in
glutamate transporters},
journal = {The EMBO journal},
volume = {38},
number = {19},
issn = {1460-2075},
address = {Hoboken, NJ [u.a.]},
publisher = {Wiley},
reportid = {FZJ-2019-04644},
pages = {e101468},
year = {2019},
abstract = {Excitatory amino acid transporters (EAAT s) mediate glial
and neuronal glutamate uptake to terminate synaptic
transmission and to ensure low resting glutamate
concentrations. Effective glutamate uptake is achieved by
cotransport with 3 Na+ and 1 H+, in exchange with 1 K+. The
underlying principles of this complex transport
stoichiometry remain poorly understood. We use molecular
dynamics simulations and electrophysiological experiments to
elucidate how mammalian EAAT s harness K+ gradients, unlike
their K+‐independent prokaryotic homologues. Glutamate
transport is achieved via elevator‐like translocation of
the transport domain. In EAAT s, glutamate‐free
re‐translocation is prevented by an external gate
remaining open until K+ binding closes and locks the gate.
Prokaryotic GltPh contains the same K+‐binding site, but
the gate can close without K+. Our study provides a
comprehensive description of K+‐dependent glutamate
transport and reveals a hitherto unknown allosteric coupling
mechanism that permits adaptions of the transport
stoichiometry without affecting ion or substrate binding.},
cin = {ICS-4 / JARA-HPC},
ddc = {570},
cid = {I:(DE-Juel1)ICS-4-20110106 / $I:(DE-82)080012_20140620$},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551) /
Mechanisms of Ca2+-activated Cl- channels and lipid
scramblases of the TMEM16 family $(jics41_20161101)$ /
Molecular dynamics of the SLC26 family of ion channels and
transporters $(jara0177_20171101)$ / Multiscale simulations
of voltage-gated sodium channel complexes and clusters
$(jics42_20181101)$ / MOLECULAR MODELLING OF BIFUNCTIONAL
MEMBRANE TRANSPORT PROTEINS $(jics40_20190501)$ / Molecular
dynamics simulations of P2X receptors $(jara0180_20200501)$},
pid = {G:(DE-HGF)POF3-551 / $G:(DE-Juel1)jics41_20161101$ /
$G:(DE-Juel1)jara0177_20171101$ /
$G:(DE-Juel1)jics42_20181101$ /
$G:(DE-Juel1)jics40_20190501$ /
$G:(DE-Juel1)jara0180_20200501$},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:31506973},
UT = {WOS:000486931900001},
doi = {10.15252/embj.2019101468},
url = {https://juser.fz-juelich.de/record/865082},
}