- EMDB-24733: Oxytocin receptor (OTR) bound to oxytocin in complex with a heter... -
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ID or keywords:
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Basic information
Entry
Database: EMDB / ID: EMD-24733
Title
Oxytocin receptor (OTR) bound to oxytocin in complex with a heterotrimeric Gq protein
Map data
Combined map from local refinements
Sample
Complex: Oxytocin receptor signaling complex with oxytocin and miniGq and an scFv
Complex: Oxytocin
Protein or peptide: Oxytocin
Complex: Oxytocin receptor
Protein or peptide: Oxytocin receptor
Complex: miniGq
Protein or peptide: 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 short
Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Complex: scFv16
Protein or peptide: scFv16
Ligand: MAGNESIUM ION
Function / homology
Function and homology information
oxytocin receptor activity / positive regulation of hindgut contraction / response to anoxia / maternal aggressive behavior / oxytocin receptor binding / neurohypophyseal hormone activity / V1A vasopressin receptor binding / Vasopressin-like receptors / regulation of systemic arterial blood pressure by vasopressin / vasopressin receptor activity ...oxytocin receptor activity / positive regulation of hindgut contraction / response to anoxia / maternal aggressive behavior / oxytocin receptor binding / neurohypophyseal hormone activity / V1A vasopressin receptor binding / Vasopressin-like receptors / regulation of systemic arterial blood pressure by vasopressin / vasopressin receptor activity / maternal process involved in parturition / response to prostaglandin E / positive regulation of penile erection / positive regulation of uterine smooth muscle contraction / positive regulation of norepinephrine secretion / negative regulation of urine volume / sperm ejaculation / telencephalon development / response to sucrose / drinking behavior / positive regulation of prostaglandin secretion / grooming behavior / response to ether / positive regulation of blood pressure / maternal behavior / neuropeptide hormone activity / positive regulation of ossification / digestive tract development / positive regulation of synapse assembly / positive regulation of female receptivity / response to food / eating behavior / male mating behavior / suckling behavior / peptide hormone binding / microvillus / social behavior / estrous cycle / positive regulation of synaptic transmission / response to electrical stimulus / response to retinoic acid / response to glucocorticoid / positive regulation of vasoconstriction / cellular response to hormone stimulus / response to cAMP / response to amphetamine / ERK1 and ERK2 cascade / negative regulation of blood pressure / lactation / regulation of heart rate / positive regulation of synaptic transmission, glutamatergic / response to cocaine / secretory granule / response to activity / response to cytokine / muscle contraction / response to progesterone / positive regulation of synaptic transmission, GABAergic / female pregnancy / adherens junction / peptide binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G-protein activation / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / terminal bouton / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / memory / ADP signalling through P2Y purinoceptor 12 / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / Sensory perception of sweet, bitter, and umami (glutamate) taste / response to peptide hormone / photoreceptor disc membrane / Adrenaline,noradrenaline inhibits insulin secretion / Glucagon-type ligand receptors / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / cellular response to catecholamine stimulus / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADORA2B mediated anti-inflammatory cytokines production / sensory perception of taste / ADP signalling through P2Y purinoceptor 1 / adenylate cyclase-activating dopamine receptor signaling pathway / G beta:gamma signalling through PI3Kgamma / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / heterotrimeric G-protein complex / G alpha (12/13) signalling events / extracellular vesicle / signaling receptor complex adaptor activity Similarity search - Function
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
T32-GM089626
United States
Citation
Journal: Nat Struct Mol Biol / Year: 2022 Title: The oxytocin signaling complex reveals a molecular switch for cation dependence. Authors: Justin G Meyerowitz / Michael J Robertson / Ximena Barros-Álvarez / Ouliana Panova / Robert M Nwokonko / Yang Gao / Georgios Skiniotis / 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 ...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 determined by cryo-EM. The structure reveals a unique activation mechanism adopted by OTR involving both the formation of a Mg 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-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.
History
Deposition
Aug 24, 2021
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Header (metadata) release
Mar 9, 2022
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Map release
Mar 9, 2022
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Update
Mar 30, 2022
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Current status
Mar 30, 2022
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
EMPIAR-10936 (Title: Oxytocin receptor (OTR) bound to oxytocin in complex with a heterotrimeric Gq protein Data size: 4.1 TB Data #1: Unaligned multi-frame micrographs of the oxytocin-oxytocin receptor-miniGq complex [micrographs - multiframe])
Entire : Oxytocin receptor signaling complex with oxytocin and miniGq and ...
Entire
Name: Oxytocin receptor signaling complex with oxytocin and miniGq and an scFv
Components
Complex: Oxytocin receptor signaling complex with oxytocin and miniGq and an scFv
Complex: Oxytocin
Protein or peptide: Oxytocin
Complex: Oxytocin receptor
Protein or peptide: Oxytocin receptor
Complex: miniGq
Protein or peptide: 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 short
Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Complex: scFv16
Protein or peptide: scFv16
Ligand: MAGNESIUM ION
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Supramolecule #1: Oxytocin receptor signaling complex with oxytocin and miniGq and ...
Supramolecule
Name: Oxytocin receptor signaling complex with oxytocin and miniGq and an scFv type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Name: MAGNESIUM ION / type: ligand / ID: 6 / Number of copies: 1 / Formula: MG
Molecular weight
Theoretical: 24.305 Da
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Experimental details
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Structure determination
Method
cryo EM
Processing
single particle reconstruction
Aggregation state
particle
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Sample preparation
Buffer
pH: 7.4
Grid
Model: UltrAuFoil R1.2/1.3 / Material: GOLD / Support film - Material: GOLD / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE
Vitrification
Cryogen name: ETHANE
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Electron microscopy
Microscope
TFS KRIOS
Image recording
Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 40 / Average exposure time: 2.497 sec. / Average electron dose: 54.8 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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