The 2.6 angstrom crystal structure of a human A2A adenosine receptor bound to an antagonist.
The 2.6 angstrom crystal structure of a human A2A adenosine receptor bound to an antagonist.
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DOI:
10.1126/science.1164772
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发表时间:
2008-11-21
期刊:
影响因子:
--
通讯作者:
Stevens RC
中科院分区:
文献类型:
--
作者:
Jaakola VP;Griffith MT;Hanson MA;Cherezov V;Chien EY;Lane JR;Ijzerman AP;Stevens RC
The adenosine class of G protein-coupled receptors mediates the important role of extracellular adenosine in many physiological processes and is antagonized by caffeine. We have determined the crystal structure of the human A2A adenosine receptor in complex with a high affinity subtype-selective antagonist, ZM241385, to 2.6 Å resolution. Four disulfide bridges in the extracellular domain combined with a subtle repacking of the transmembrane helices relative to the adrenergic and rhodopsin receptor structures defines a pocket distinct from that of other structurally determined GPCRs. The arrangement allows for the binding of the antagonist in an extended conformation perpendicular to the membrane plane. The binding site highlights an integral role for the extracellular loops, together with the helical core in ligand recognition by this class of GPCRs, and suggests a role for ZM241385 in restricting the movement of a tryptophan residue important in the activation mechanism of the class A receptors.
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