Structure of a nanobody-stabilized active state of the β(2) adrenoceptor.

Structure of a nanobody-stabilized active state of the β(2) adrenoceptor.
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DOI:
10.1038/nature09648
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发表时间:
2011-01-13
期刊:
影响因子:
64.8
通讯作者:
Kobilka, Brian K.
Kobilka, Brian K.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Rasmussen, Soren G. F.;Choi, Hee-Jung;Fung, Juan Jose;Pardon, Els;Casarosa, Paola;Chae, Pil Seok;DeVree, Brian T.;Rosenbaum, Daniel M.;Thian, Foon Sun;Kobilka, Tong Sun;Schnapp, Andreas;Konetzki, Ingo;Sunahara, Roger K.;Gellman, Samuel H.;Pautsch, Alexander;Steyaert, Jan;Weis, William I.;Kobilka, Brian K.

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G protein coupled receptors (GPCRs) exhibit a spectrum of functional behaviors in response to natural and synthetic ligands. Recent crystal structures provide insights into inactive states of several GPCRs. Efforts to obtain an agonist-bound active-state GPCR structure have proven difficult due to the inherent instability of this state in the absence of a G protein. We generated a camelid antibody fragment (nanobody) to the human β2 adrenergic receptor (β2AR) that exhibits G protein-like behavior, and obtained an agonist-bound, active-state crystal structure of the receptor-nanobody complex. Comparison with the inactive β2AR structure reveals subtle changes in the binding pocket; however, these small changes are associated with an 11Å outward movement of the cytoplasmic end of transmembrane segment 6, and rearrangements of transmembrane segments 5 and 7 that are remarkably similar to those observed in opsin, an active form of rhodopsin. This structure provides insights into the process of agonist binding and activation.
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