Conformational changes in the G protein Gs induced by the β2 adrenergic receptor
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Conformational changes in the G protein Gs induced by the β2 adrenergic receptor. / Chung, Ka Young; Rasmussen, Søren Gøgsig Faarup; Liu, Tong; Li, Sheng; DeVree, Brian T; Chae, Pil Seok; Calinski, Diane; Kobilka, Brian K; Woods, Virgil L; Sunahara, Roger K.
In: Nature, Vol. 477, No. 7366, 29.09.2011, p. 611-5.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Conformational changes in the G protein Gs induced by the β2 adrenergic receptor
AU - Chung, Ka Young
AU - Rasmussen, Søren Gøgsig Faarup
AU - Liu, Tong
AU - Li, Sheng
AU - DeVree, Brian T
AU - Chae, Pil Seok
AU - Calinski, Diane
AU - Kobilka, Brian K
AU - Woods, Virgil L
AU - Sunahara, Roger K
N1 - © 2011 Macmillan Publishers Limited. All rights reserved
PY - 2011/9/29
Y1 - 2011/9/29
N2 - G protein-coupled receptors represent the largest family of membrane receptors that instigate signalling through nucleotide exchange on heterotrimeric G proteins. Nucleotide exchange, or more precisely, GDP dissociation from the G protein α-subunit, is the key step towards G protein activation and initiation of downstream signalling cascades. Despite a wealth of biochemical and biophysical studies on inactive and active conformations of several heterotrimeric G proteins, the molecular underpinnings of G protein activation remain elusive. To characterize this mechanism, we applied peptide amide hydrogen-deuterium exchange mass spectrometry to probe changes in the structure of the heterotrimeric bovine G protein, Gs (the stimulatory G protein for adenylyl cyclase) on formation of a complex with agonist-bound human β(2) adrenergic receptor (β(2)AR). Here we report structural links between the receptor-binding surface and the nucleotide-binding pocket of Gs that undergo higher levels of hydrogen-deuterium exchange than would be predicted from the crystal structure of the β(2)AR-Gs complex. Together with X-ray crystallographic and electron microscopic data of the β(2)AR-Gs complex (from refs 2, 3), we provide a rationale for a mechanism of nucleotide exchange, whereby the receptor perturbs the structure of the amino-terminal region of the α-subunit of Gs and consequently alters the 'P-loop' that binds the β-phosphate in GDP. As with the Ras family of small-molecular-weight G proteins, P-loop stabilization and β-phosphate coordination are key determinants of GDP (and GTP) binding affinity.
AB - G protein-coupled receptors represent the largest family of membrane receptors that instigate signalling through nucleotide exchange on heterotrimeric G proteins. Nucleotide exchange, or more precisely, GDP dissociation from the G protein α-subunit, is the key step towards G protein activation and initiation of downstream signalling cascades. Despite a wealth of biochemical and biophysical studies on inactive and active conformations of several heterotrimeric G proteins, the molecular underpinnings of G protein activation remain elusive. To characterize this mechanism, we applied peptide amide hydrogen-deuterium exchange mass spectrometry to probe changes in the structure of the heterotrimeric bovine G protein, Gs (the stimulatory G protein for adenylyl cyclase) on formation of a complex with agonist-bound human β(2) adrenergic receptor (β(2)AR). Here we report structural links between the receptor-binding surface and the nucleotide-binding pocket of Gs that undergo higher levels of hydrogen-deuterium exchange than would be predicted from the crystal structure of the β(2)AR-Gs complex. Together with X-ray crystallographic and electron microscopic data of the β(2)AR-Gs complex (from refs 2, 3), we provide a rationale for a mechanism of nucleotide exchange, whereby the receptor perturbs the structure of the amino-terminal region of the α-subunit of Gs and consequently alters the 'P-loop' that binds the β-phosphate in GDP. As with the Ras family of small-molecular-weight G proteins, P-loop stabilization and β-phosphate coordination are key determinants of GDP (and GTP) binding affinity.
KW - Adrenergic beta-2 Receptor Agonists
KW - Animals
KW - Biocatalysis
KW - Catalytic Domain
KW - Cattle
KW - Crystallography, X-Ray
KW - Deuterium Exchange Measurement
KW - GTP-Binding Protein alpha Subunits, Gs
KW - Guanosine Diphosphate
KW - Guanosine Triphosphate
KW - Humans
KW - Models, Molecular
KW - Protein Binding
KW - Protein Conformation
KW - Receptors, Adrenergic, beta-2
U2 - 10.1038/nature10488
DO - 10.1038/nature10488
M3 - Journal article
C2 - 21956331
VL - 477
SP - 611
EP - 615
JO - Nature
JF - Nature
SN - 0028-0836
IS - 7366
ER -
ID: 120588099