4LDO

Structure of beta2 adrenoceptor bound to adrenaline and an engineered nanobody

4LDO の概要

• エントリーDOI: 10.2210/pdb4ldo/pdb
• 関連するPDBエントリー: 4LDE 4LDL
• 分子名称: Lysozyme, Beta-2 adrenergic receptor, Camelid Antibody Fragment, (2S)-2,3-dihydroxypropyl (7Z)-tetradec-7-enoate, ... (6 entities in total)
• 機能のキーワード: g protein coupled receptor, membrane protein-hydrolase complex, membrane protein/hydrolase
• 由来する生物種: Enterobacteria phage T4; 詳細
• 細胞内の位置: Cell membrane ; Multi- pass membrane protein : P07550
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 66950.03

構造登録者

Ring, A.M.,Manglik, A.,Kruse, A.C.,Enos, M.D.,Weis, W.I.,Garcia, K.C.,Kobilka, B.K. (登録日: 2013-06-24, 公開日: 2013-09-25, 最終更新日: 2024-11-20)

主引用文献

Ring, A.M.,Manglik, A.,Kruse, A.C.,Enos, M.D.,Weis, W.I.,Garcia, K.C.,Kobilka, B.K.
Adrenaline-activated structure of beta 2-adrenoceptor stabilized by an engineered nanobody.
Nature, 502:575-579, 2013

PubMed Abstract: G-protein-coupled receptors (GPCRs) are integral membrane proteins that have an essential role in human physiology, yet the molecular processes through which they bind to their endogenous agonists and activate effector proteins remain poorly understood. So far, it has not been possible to capture an active-state GPCR bound to its native neurotransmitter. Crystal structures of agonist-bound GPCRs have relied on the use of either exceptionally high-affinity agonists or receptor stabilization by mutagenesis. Many natural agonists such as adrenaline, which activates the β2-adrenoceptor (β2AR), bind with relatively low affinity, and they are often chemically unstable. Using directed evolution, we engineered a high-affinity camelid antibody fragment that stabilizes the active state of the β2AR, and used this to obtain crystal structures of the activated receptor bound to multiple ligands. Here we present structures of the active-state human β2AR bound to three chemically distinct agonists: the ultrahigh-affinity agonist BI167107, the high-affinity catecholamine agonist hydroxybenzyl isoproterenol, and the low-affinity endogenous agonist adrenaline. The crystal structures reveal a highly conserved overall ligand recognition and activation mode despite diverse ligand chemical structures and affinities that range from 100 nM to ∼80 pM. Overall, the adrenaline-bound receptor structure is similar to the others, but it has substantial rearrangements in extracellular loop three and the extracellular tip of transmembrane helix 6. These structures also reveal a water-mediated hydrogen bond between two conserved tyrosines, which appears to stabilize the active state of the β2AR and related GPCRs.

PubMed: 24056936
DOI: 10.1038/nature12572

実験手法

X-RAY DIFFRACTION (3.2 Å)