Structure and function of an irreversible agonist-β(2) adrenoceptor complex

Daniel M Rosenbaum; Cheng Zhang; Joseph A Lyons; Ralph Holl; David Aragao; Daniel H Arlow; Søren Gøgsig Faarup Rasmussen; Hee-Jung Choi; Brian T Devree; Roger K Sunahara; Pil Seok Chae; Samuel H Gellman; Ron O Dror; David E Shaw; William I Weis; Martin Caffrey; Peter Gmeiner; Brian K Kobilka

doi:10.1038/nature09665

Structure and function of an irreversible agonist-β(2) adrenoceptor complex

Daniel M Rosenbaum, Cheng Zhang, Joseph A Lyons, Ralph Holl, David Aragao, Daniel H Arlow, Søren Gøgsig Faarup Rasmussen, Hee-Jung Choi, Brian T Devree, Roger K Sunahara, Pil Seok Chae, Samuel H Gellman, Ron O Dror, David E Shaw, William I Weis, Martin Caffrey, Peter Gmeiner, Brian K Kobilka

Neuropharm and Genetics

612 Citations (Scopus)

Abstract

G-protein-coupled receptors (GPCRs) are eukaryotic integral membrane proteins that modulate biological function by initiating cellular signalling in response to chemically diverse agonists. Despite recent progress in the structural biology of GPCRs, the molecular basis for agonist binding and allosteric modulation of these proteins is poorly understood. Structural knowledge of agonist-bound states is essential for deciphering the mechanism of receptor activation, and for structure-guided design and optimization of ligands. However, the crystallization of agonist-bound GPCRs has been hampered by modest affinities and rapid off-rates of available agonists. Using the inactive structure of the human β₂ adrenergic receptor (β₂ AR) as a guide, we designed a β₂ AR agonist that can be covalently tethered to a specific site on the receptor through a disulphide bond. The covalent β₂ AR-agonist complex forms efficiently, and is capable of activating a heterotrimeric G protein. We crystallized a covalent agonist-bound β₂ ARg-T4L fusion protein in lipid bilayers through the use of the lipidic mesophase method, and determined its structure at 3.5 Å resolution. A comparison to the inactive structure and an antibody-stabilized active structure (companion paper) shows how binding events at both the extracellular and intracellular surfaces are required to stabilize an active conformation of the receptor. The structures are in agreement with long-timescale (up to 30μs) molecular dynamics simulations showing that an agonist-bound active conformation spontaneously relaxes to an inactive-like conformation in the absence of a G protein or stabilizing antibody.

Original language	English
Journal	Nature
Volume	469
Issue number	7329
Pages (from-to)	236-40
Number of pages	5
ISSN	0028-0836
DOIs	https://doi.org/10.1038/nature09665
Publication status	Published - 13 Jan 2011

Keywords

Adrenergic beta-2 Receptor Agonists
Crystallization
Crystallography, X-Ray
Disulfides
Drug Inverse Agonism
Heterotrimeric GTP-Binding Proteins
Humans
Lipid Bilayers
Models, Molecular
Molecular Dynamics Simulation
Procaterol
Propanolamines
Protein Conformation
Receptors, Adrenergic, beta-2
Recombinant Fusion Proteins
Viral Proteins

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Rosenbaum, D. M., Zhang, C., Lyons, J. A., Holl, R., Aragao, D., Arlow, D. H., Rasmussen, S. G. F., Choi, H-J., Devree, B. T., Sunahara, R. K., Chae, P. S., Gellman, S. H., Dror, R. O., Shaw, D. E., Weis, W. I., Caffrey, M., Gmeiner, P., & Kobilka, B. K. (2011). Structure and function of an irreversible agonist-β(2) adrenoceptor complex. Nature, 469(7329), 236-40. https://doi.org/10.1038/nature09665

Rosenbaum, DM, Zhang, C, Lyons, JA, Holl, R, Aragao, D, Arlow, DH, Rasmussen, SGF, Choi, H-J, Devree, BT, Sunahara, RK, Chae, PS, Gellman, SH, Dror, RO, Shaw, DE, Weis, WI, Caffrey, M, Gmeiner, P & Kobilka, BK 2011, 'Structure and function of an irreversible agonist-β(2) adrenoceptor complex', Nature, vol. 469, no. 7329, pp. 236-40. https://doi.org/10.1038/nature09665

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abstract = "G-protein-coupled receptors (GPCRs) are eukaryotic integral membrane proteins that modulate biological function by initiating cellular signalling in response to chemically diverse agonists. Despite recent progress in the structural biology of GPCRs, the molecular basis for agonist binding and allosteric modulation of these proteins is poorly understood. Structural knowledge of agonist-bound states is essential for deciphering the mechanism of receptor activation, and for structure-guided design and optimization of ligands. However, the crystallization of agonist-bound GPCRs has been hampered by modest affinities and rapid off-rates of available agonists. Using the inactive structure of the human β2 adrenergic receptor (β2 AR) as a guide, we designed a β2 AR agonist that can be covalently tethered to a specific site on the receptor through a disulphide bond. The covalent β2 AR-agonist complex forms efficiently, and is capable of activating a heterotrimeric G protein. We crystallized a covalent agonist-bound β2 ARg-T4L fusion protein in lipid bilayers through the use of the lipidic mesophase method, and determined its structure at 3.5 {\AA} resolution. A comparison to the inactive structure and an antibody-stabilized active structure (companion paper) shows how binding events at both the extracellular and intracellular surfaces are required to stabilize an active conformation of the receptor. The structures are in agreement with long-timescale (up to 30μs) molecular dynamics simulations showing that an agonist-bound active conformation spontaneously relaxes to an inactive-like conformation in the absence of a G protein or stabilizing antibody.",

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T1 - Structure and function of an irreversible agonist-β(2) adrenoceptor complex

AU - Rosenbaum, Daniel M

AU - Zhang, Cheng

AU - Lyons, Joseph A

AU - Holl, Ralph

AU - Aragao, David

AU - Arlow, Daniel H

AU - Rasmussen, Søren Gøgsig Faarup

AU - Choi, Hee-Jung

AU - Devree, Brian T

AU - Sunahara, Roger K

AU - Chae, Pil Seok

AU - Gellman, Samuel H

AU - Dror, Ron O

AU - Shaw, David E

AU - Weis, William I

AU - Caffrey, Martin

AU - Gmeiner, Peter

AU - Kobilka, Brian K

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N2 - G-protein-coupled receptors (GPCRs) are eukaryotic integral membrane proteins that modulate biological function by initiating cellular signalling in response to chemically diverse agonists. Despite recent progress in the structural biology of GPCRs, the molecular basis for agonist binding and allosteric modulation of these proteins is poorly understood. Structural knowledge of agonist-bound states is essential for deciphering the mechanism of receptor activation, and for structure-guided design and optimization of ligands. However, the crystallization of agonist-bound GPCRs has been hampered by modest affinities and rapid off-rates of available agonists. Using the inactive structure of the human β2 adrenergic receptor (β2 AR) as a guide, we designed a β2 AR agonist that can be covalently tethered to a specific site on the receptor through a disulphide bond. The covalent β2 AR-agonist complex forms efficiently, and is capable of activating a heterotrimeric G protein. We crystallized a covalent agonist-bound β2 ARg-T4L fusion protein in lipid bilayers through the use of the lipidic mesophase method, and determined its structure at 3.5 Å resolution. A comparison to the inactive structure and an antibody-stabilized active structure (companion paper) shows how binding events at both the extracellular and intracellular surfaces are required to stabilize an active conformation of the receptor. The structures are in agreement with long-timescale (up to 30μs) molecular dynamics simulations showing that an agonist-bound active conformation spontaneously relaxes to an inactive-like conformation in the absence of a G protein or stabilizing antibody.

AB - G-protein-coupled receptors (GPCRs) are eukaryotic integral membrane proteins that modulate biological function by initiating cellular signalling in response to chemically diverse agonists. Despite recent progress in the structural biology of GPCRs, the molecular basis for agonist binding and allosteric modulation of these proteins is poorly understood. Structural knowledge of agonist-bound states is essential for deciphering the mechanism of receptor activation, and for structure-guided design and optimization of ligands. However, the crystallization of agonist-bound GPCRs has been hampered by modest affinities and rapid off-rates of available agonists. Using the inactive structure of the human β2 adrenergic receptor (β2 AR) as a guide, we designed a β2 AR agonist that can be covalently tethered to a specific site on the receptor through a disulphide bond. The covalent β2 AR-agonist complex forms efficiently, and is capable of activating a heterotrimeric G protein. We crystallized a covalent agonist-bound β2 ARg-T4L fusion protein in lipid bilayers through the use of the lipidic mesophase method, and determined its structure at 3.5 Å resolution. A comparison to the inactive structure and an antibody-stabilized active structure (companion paper) shows how binding events at both the extracellular and intracellular surfaces are required to stabilize an active conformation of the receptor. The structures are in agreement with long-timescale (up to 30μs) molecular dynamics simulations showing that an agonist-bound active conformation spontaneously relaxes to an inactive-like conformation in the absence of a G protein or stabilizing antibody.

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KW - Disulfides

KW - Drug Inverse Agonism

KW - Heterotrimeric GTP-Binding Proteins

KW - Humans

KW - Lipid Bilayers

KW - Models, Molecular

KW - Molecular Dynamics Simulation

KW - Procaterol

KW - Propanolamines

KW - Protein Conformation

KW - Receptors, Adrenergic, beta-2

KW - Recombinant Fusion Proteins

KW - Viral Proteins

U2 - 10.1038/nature09665

DO - 10.1038/nature09665

M3 - Journal article

C2 - 21228876

SN - 0028-0836

VL - 469

SP - 236

EP - 240

JO - Nature

JF - Nature

IS - 7329

ER -

Structure and function of an irreversible agonist-β(2) adrenoceptor complex

Abstract

Keywords

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