A role for a specific cholesterol interaction in stabilizing the Apo configuration of the human A(2A) adenosine receptor.

A role for a specific cholesterol interaction in stabilizing the Apo configuration of the human A(2A) adenosine receptor.
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DOI:
10.1016/j.str.2009.10.010
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发表时间:
2009-12-09
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Voth GA
Voth GA
中科院分区:
其他
文献类型:
--
作者:
Lyman E;Higgs C;Kim B;Lupyan D;Shelley JC;Farid R;Voth GA

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The function of G-protein coupled receptors is tightly modulated by the lipid environment. Long timescale molecular dynamics simulations (totaling ~3 microsec) of the A2A receptor in cholesterol-free bilayers, with and without the antagonist ZM241385 bound, demonstrate an instability of helix II in the apo receptor in cholesterol-poor membrane regions. We directly observe that the effect of cholesterol binding is to stabilize helix II against a buckling type deformation, perhaps rationalizing the observation that the A2A receptor couples to G-protein only in the presence of cholesterol. The results suggest a mechanism by which the A2A receptor may function as a coincidence detector, activating only in the presence of both cholesterol and agonist. We also observed a previously hypothesized conformation of the tryptophan “rotameric switch” on helix VI in which a phenylalanine on helix V positions the tryptophan out of the ligand binding pocket.
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