Computational modeling of the N-terminus of the human dopamine transporter and its interaction with PIP2 -containing membranes.
Computational modeling of the N-terminus of the human dopamine transporter and its interaction with PIP2 -containing membranes.
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DOI:
10.1002/prot.24792
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发表时间:
2015-05
影响因子:
2.9
通讯作者:
Weinstein, Harel
中科院分区:
文献类型:
--
作者:
Khelashvili, George;Doktorova, Milka;Sahai, Michelle A.;Johner, Niklaus;Shi, Lei;Weinstein, Harel
关键词:
The dopamine transporter (DAT) is a transmembrane protein belonging to the family of Neurotransmitter:Sodium Symporters (NSS). Members of the NSS are responsible for the clearance of neurotransmitters from the synaptic cleft, and for their translocation back into the presynaptic nerve terminal. The DAT contains long intracellular N- and C-terminal domains that are strongly implicated in the transporter function. The N-terminus (N-term), in particular, regulates the reverse transport (efflux) of the substrate through DAT. Currently, the molecular mechanisms of the efflux remain elusive in large part due to lack of structural information on the N-terminal segment. Here we report a computational model of the N-term of the human DAT (hDAT), obtained through an ab initio structure prediction, in combination with extensive atomistic molecular dynamics (MD) simulations in the context of a lipid membrane. Our analysis reveals that whereas the N-term is a highly dynamic domain, it contains secondary structure elements that remain stable in the long MD trajectories of interactions with the bilayer (totaling >2.2 µs). Combining MD simulations with continuum mean-field modeling we found that the N-term engages with lipid membranes through electrostatic interactions with the charged lipids PIP2 (phosphatidylinositol 4,5-Biphosphate) or PS (phosphatidylserine) that are present in these bilayers. We identify specific motifs along the N-term implicated in such interactions and show that differential modes of N-term/membrane association result in differential positioning of the structured segments on the membrane surface. These results will inform future structure-based studies that will elucidate the mechanistic role of the N-term in DAT function.
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DOI:
10.1523/jneurosci.5094-09.2010
发表时间:
2010-04-28
期刊:
The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子:
--
作者:
Bowton E;Saunders C;Erreger K;Sakrikar D;Matthies HJ;Sen N;Jessen T;Colbran RJ;Caron MG;Javitch JA;Blakely RD;Galli A
通讯作者:
Galli A
DOI:
10.1107/s0907444913007051
发表时间:
2013-05
期刊:
Acta crystallographica. Section D, Biological crystallography
影响因子:
--
作者:
Biasini M;Schmidt T;Bienert S;Mariani V;Studer G;Haas J;Johner N;Schenk AD;Philippsen A;Schwede T
通讯作者:
Schwede T
影响因子:
4.8
作者:
Foster, JD;Pananusorn, B;Vaughan, RA
通讯作者:
Vaughan, RA
影响因子:
25
作者:
Cremona, M. Laura;Matthies, Heinrich J. G.;Pau, Kelvin;Bowton, Erica;Speed, Nicole;Lute, Brandon J.;Anderson, Monique;Sen, Namita;Robertson, Sabrina D.;Vaughan, Roxanne A.;Rothman, James E.;Galli, Aurelio;Javitch, Jonathan A.;Yamamoto, Ai
通讯作者:
Yamamoto, Ai
影响因子:
5.5
作者:
Best, Robert B.;Zhu, Xiao;Shim, Jihyun;Lopes, Pedro E. M.;Mittal, Jeetain;Feig, Michael;MacKerell, Alexander D., Jr.
通讯作者:
MacKerell, Alexander D., Jr.