7SQO

Structure of the orexin-2 receptor(OX2R) bound to TAK-925, Gi and scFv16


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.17 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Molecular mechanism of the wake-promoting agent TAK-925.

Yin, J.Kang, Y.McGrath, A.P.Chapman, K.Sjodt, M.Kimura, E.Okabe, A.Koike, T.Miyanohana, Y.Shimizu, Y.Rallabandi, R.Lian, P.Bai, X.Flinspach, M.De Brabander, J.K.Rosenbaum, D.M.

(2022) Nat Commun 13: 2902-2902

  • DOI: 10.1038/s41467-022-30601-3
  • Primary Citation of Related Structures:  
    7SQO, 7SR8

  • PubMed Abstract: 
  • The OX 2 orexin receptor (OX 2 R) is a highly expressed G protein-coupled receptor (GPCR) in the brain that regulates wakefulness and circadian rhythms in humans. Antagonism of OX 2 R is a proven therapeutic strategy for insomnia drugs, and agonism of OX 2 R is a potentially powerful approach for narcolepsy type 1, which is characterized by the death of orexinergic neurons ...

    The OX 2 orexin receptor (OX 2 R) is a highly expressed G protein-coupled receptor (GPCR) in the brain that regulates wakefulness and circadian rhythms in humans. Antagonism of OX 2 R is a proven therapeutic strategy for insomnia drugs, and agonism of OX 2 R is a potentially powerful approach for narcolepsy type 1, which is characterized by the death of orexinergic neurons. Until recently, agonism of OX 2 R had been considered 'undruggable.' We harness cryo-electron microscopy of OX 2 R-G protein complexes to determine how the first clinically tested OX 2 R agonist TAK-925 can activate OX 2 R in a highly selective manner. Two structures of TAK-925-bound OX 2 R with either a G q mimetic or G i reveal that TAK-925 binds at the same site occupied by antagonists, yet interacts with the transmembrane helices to trigger activating microswitches. Our structural and mutagenesis data show that TAK-925's selectivity is mediated by subtle differences between OX 1 and OX 2 receptor subtypes at the orthosteric pocket. Finally, differences in the polarity of interactions at the G protein binding interfaces help to rationalize OX 2 R's coupling selectivity for G q signaling. The mechanisms of TAK-925's binding, activation, and selectivity presented herein will aid in understanding the efficacy of small molecule OX 2 R agonists for narcolepsy and other circadian disorders.


    Organizational Affiliation

    Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA. dan.rosenbaum@utsouthwestern.edu.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Orexin receptor type 2A [auth R]444Homo sapiensMutation(s): 0 
Gene Names: HCRTR2
Membrane Entity: Yes 
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PHAROS:  O43614
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UniProt GroupO43614
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(i) subunit alpha-1B [auth A]354Homo sapiensMutation(s): 0 
Gene Names: GNAI1
Membrane Entity: Yes 
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PHAROS:  P63096
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UniProt GroupP63096
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1C [auth B]354Bos taurusMutation(s): 0 
Gene Names: GNB1
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2D [auth G]68Bos taurusMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
scFv-16E247synthetic constructMutation(s): 0 
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Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
A6F (Subject of Investigation/LOI)
Query on A6F

Download Ideal Coordinates CCD File 
J [auth R]methyl (2R,3S)-3-[(methanesulfonyl)amino]-2-({[(1s,4S)-4-phenylcyclohexyl]oxy}methyl)piperidine-1-carboxylate
C21 H32 N2 O5 S
UXZAJSZFFARTEI-YRPNKDGESA-N
 Ligand Interaction
OLA
Query on OLA

Download Ideal Coordinates CCD File 
F [auth R],
G [auth R],
H [auth R],
I [auth R]
OLEIC ACID
C18 H34 O2
ZQPPMHVWECSIRJ-KTKRTIGZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.17 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other private--

Revision History  (Full details and data files)

  • Version 1.0: 2022-05-25
    Type: Initial release
  • Version 1.1: 2022-07-06
    Changes: Database references