7RYC

Oxytocin receptor (OTR) bound to oxytocin in complex with a heterotrimeric Gq protein


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The oxytocin signaling complex reveals a molecular switch for cation dependence.

Meyerowitz, J.G.Robertson, M.J.Barros-Alvarez, X.Panova, O.Nwokonko, R.M.Gao, Y.Skiniotis, G.

(2022) Nat Struct Mol Biol 29: 274-281

  • DOI: 10.1038/s41594-022-00728-4
  • Primary Citation of Related Structures:  
    7RYC

  • PubMed Abstract: 
  • Oxytocin (OT) and vasopressin (AVP) are conserved peptide signaling hormones that are critical for diverse processes including osmotic homeostasis, reproduction, lactation and social interaction. OT acts through the oxytocin receptor (OTR), a magnesium-dependent G protein-coupled receptor that is a therapeutic target for treatment of postpartum hemorrhage, dysfunctional labor and autism ...

    Oxytocin (OT) and vasopressin (AVP) are conserved peptide signaling hormones that are critical for diverse processes including osmotic homeostasis, reproduction, lactation and social interaction. OT acts through the oxytocin receptor (OTR), a magnesium-dependent G protein-coupled receptor that is a therapeutic target for treatment of postpartum hemorrhage, dysfunctional labor and autism. However, the molecular mechanisms that underlie OTR activation by OT and the dependence on magnesium remain unknown. Here we present the wild-type active-state structure of human OTR bound to OT and miniG q/i determined by cryo-EM. The structure reveals a unique activation mechanism adopted by OTR involving both the formation of a Mg 2+ coordination complex between OT and the receptor, and disruption of transmembrane helix 7 (TM7) by OT. Our functional assays demonstrate the role of TM7 disruption and provide the mechanism of full agonism by OT and partial agonism by OT analogs. Furthermore, we find that the identity of a single cation-coordinating residue across vasopressin family receptors determines whether the receptor is cation-dependent. Collectively, these results demonstrate how the Mg 2+ -dependent OTR is activated by OT, provide essential information for structure-based drug discovery efforts and shed light on the molecular determinants of cation dependence of vasopressin family receptors throughout the animal kingdom.


    Organizational Affiliation

    Department of Structural Biology, Stanford University School of Medicine, Stanford, CA, USA. yiorgo@stanford.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OxytocinA [auth L]10Homo sapiensMutation(s): 1 
Gene Names: OXTOT
Membrane Entity: Yes 
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Find proteins for P01178 (Homo sapiens)
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PHAROS:  P01178
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UniProt GroupP01178
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Oxytocin receptorB [auth O]450Homo sapiensMutation(s): 0 
Gene Names: OXTR
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P30559 (Homo sapiens)
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PHAROS:  P30559
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UniProt GroupP30559
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2, Guanine nucleotide-binding protein G(i) subunit alpha-2,Guanine nucleotide-binding protein G(s) subunit alpha isoforms shortC [auth D]326Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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Find proteins for P04899 (Homo sapiens)
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Find proteins for P63092 (Homo sapiens)
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Find proteins for P59768 (Homo sapiens)
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UniProt GroupsP63092P59768P04899
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1D [auth C]345Homo sapiensMutation(s): 0 
Gene Names: GNB1
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Find proteins for P62873 (Homo sapiens)
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PHAROS:  P62873
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UniProt GroupP62873
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
scFv16E260Mus musculusMutation(s): 0 
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Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG (Subject of Investigation/LOI)
Query on MG

Download Ideal Coordinates CCD File 
F [auth O]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesT32-GM089626

Revision History  (Full details and data files)

  • Version 1.0: 2022-03-09
    Type: Initial release
  • Version 1.1: 2022-03-16
    Changes: Database references
  • Version 1.2: 2022-03-30
    Changes: Database references