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- EMDB-66208: Cryo-EM structure of endomorphin-1-muOR-Gz-scFv16 complex -

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Entry
Database: EMDB / ID: EMD-66208
TitleCryo-EM structure of endomorphin-1-muOR-Gz-scFv16 complex
Map data
Sample
  • Complex: Complex of endomorphin-1 bound MOR-Gz protein
    • Protein or peptide: Engineered guanine nucleotide-binding protein G(z) subunit alpha
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: Mu-type opioid receptor,Vasopressin V2 receptor
    • Protein or peptide: endomorphin-1
  • Ligand: water
KeywordsG-protein-coupled receptors / mu-opioid receptor / single particle / Cryo-EM / MEMBRANE PROTEIN
Function / homology
Function and homology information


Opioid Signalling / renal water retention / Defective AVP does not bind AVPR2 and causes neurohypophyseal diabetes insipidus (NDI) / Vasopressin-like receptors / regulation of systemic arterial blood pressure by vasopressin / vasopressin receptor activity / G-protein activation / beta-endorphin receptor activity / morphine receptor activity / negative regulation of Wnt protein secretion ...Opioid Signalling / renal water retention / Defective AVP does not bind AVPR2 and causes neurohypophyseal diabetes insipidus (NDI) / Vasopressin-like receptors / regulation of systemic arterial blood pressure by vasopressin / vasopressin receptor activity / G-protein activation / beta-endorphin receptor activity / morphine receptor activity / negative regulation of Wnt protein secretion / Peptide ligand-binding receptors / G protein-coupled opioid receptor activity / G protein-coupled opioid receptor signaling pathway / hemostasis / telencephalon development / G alpha (i) signalling events / negative regulation of nitric oxide biosynthetic process / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / regulation of NMDA receptor activity / positive regulation of neurogenesis / negative regulation of cytosolic calcium ion concentration / positive regulation of vasoconstriction / transmission of nerve impulse / positive regulation of systemic arterial blood pressure / positive regulation of intracellular signal transduction / endocytic vesicle / G-protein alpha-subunit binding / activation of adenylate cyclase activity / cellular response to hormone stimulus / response to cytokine / sensory perception of pain / presynaptic modulation of chemical synaptic transmission / locomotory behavior / clathrin-coated endocytic vesicle membrane / G protein-coupled receptor activity / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / GABA-ergic synapse / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / 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-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / photoreceptor disc membrane / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / ADP signalling through P2Y purinoceptor 1 / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / Cargo recognition for clathrin-mediated endocytosis / G-protein beta-subunit binding / cellular response to prostaglandin E stimulus / heterotrimeric G-protein complex / Inactivation, recovery and regulation of the phototransduction cascade / G alpha (12/13) signalling events / presynapse / extracellular vesicle / sensory perception of taste / Clathrin-mediated endocytosis / Thrombin signalling through proteinase activated receptors (PARs) / signaling receptor complex adaptor activity / retina development in camera-type eye / GTPase binding / Ca2+ pathway / fibroblast proliferation / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / perikaryon / G alpha (q) signalling events / Ras protein signal transduction / Extra-nuclear estrogen signaling / positive regulation of ERK1 and ERK2 cascade / cell population proliferation / endosome / G protein-coupled receptor signaling pathway / axon / negative regulation of cell population proliferation / lysosomal membrane / GTPase activity / positive regulation of cell population proliferation
Similarity search - Function
Vasopressin V2 receptor / Vasopressin receptor / Mu opioid receptor / Opioid receptor / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs ...Vasopressin V2 receptor / Vasopressin receptor / Mu opioid receptor / Opioid receptor / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 7 transmembrane receptor (rhodopsin family) / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
Vasopressin V2 receptor / Mu-type opioid receptor / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Similarity search - Component
Biological speciesHomo sapiens (human) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsZhang H / Wang X / Xi K / Shen Q / Xue J / Zhu Y / Yang G / Zhang Y
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Cell Res / Year: 2025
Title: The molecular basis of μ-opioid receptor signaling plasticity.
Authors: Huibing Zhang / Xueting Wang / Kun Xi / Qingya Shen / Jianheng Xue / Yanqing Zhu / Shao-Kun Zang / Tianqiang Yu / Dan-Dan Shen / Jia Guo / Li-Nan Chen / Su-Yu Ji / Jiao Qin / Yingjun Dong / ...Authors: Huibing Zhang / Xueting Wang / Kun Xi / Qingya Shen / Jianheng Xue / Yanqing Zhu / Shao-Kun Zang / Tianqiang Yu / Dan-Dan Shen / Jia Guo / Li-Nan Chen / Su-Yu Ji / Jiao Qin / Yingjun Dong / Mingming Zhao / Ming Yang / Haijing Wu / Guoli Yang / Yan Zhang /
Abstract: Activation of the μ-opioid receptor (μOR) alleviates pain but also elicits adverse effects through diverse G proteins and β-arrestins. The structural details of μOR complexes with G and β- ...Activation of the μ-opioid receptor (μOR) alleviates pain but also elicits adverse effects through diverse G proteins and β-arrestins. The structural details of μOR complexes with G and β-arrestins have not been determined, impeding a comprehensive understanding of μOR signaling plasticity. Here, we present the cryo-EM structures of the μOR-G and μOR-βarr1 complexes, revealing selective conformational preferences of μOR when engaged with specific downstream signaling transducers. Integrated receptor pharmacology, including high-resolution structural analysis, cell signaling assays, and molecular dynamics simulations, demonstrated that transmembrane helix 1 (TM1) acts as an allosteric regulator of μOR signaling bias through differential stabilization of the G-, G-, and βarr1-bound states. Mechanistically, outward TM1 displacement confers structural flexibility that promotes G protein recruitment, whereas inward TM1 retraction facilitates βarr1 recruitment by stabilizing the intracellular binding pocket through coordinated interactions with TM2, TM7, and helix8. Structural comparisons between the G-, G-, and βarr1-bound complexes identified a TM1-fusion pocket with significant implications for downstream signaling regulation. Overall, we demonstrate that the conformational and thermodynamic heterogeneity of TM1 allosterically drives the downstream signaling specificity and plasticity of μOR, thereby expanding the understanding of μOR signal transduction mechanisms and providing new avenues for the rational design of analgesics.
History
DepositionSep 15, 2025-
Header (metadata) releaseNov 26, 2025-
Map releaseNov 26, 2025-
UpdateDec 24, 2025-
Current statusDec 24, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_66208.png

Downloads & links

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Map

FileDownload / File: emd_66208.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.93 Å/pix.
x 256 pix.
= 238.08 Å		0.93 Å/pix.
x 256 pix.
= 238.08 Å		0.93 Å/pix.
x 256 pix.
= 238.08 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.93 Å
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Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.008
Minimum - Maximum-0.046653032 - 0.09037814
Average (Standard dev.)0.0000063361476 (±0.002478797)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 238.08 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_66208_half_map_1.map
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Half map: #1

Fileemd_66208_half_map_2.map
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Sample components

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Entire : Complex of endomorphin-1 bound MOR-Gz protein

EntireName: Complex of endomorphin-1 bound MOR-Gz protein
Components
  • Complex: Complex of endomorphin-1 bound MOR-Gz protein
    • Protein or peptide: Engineered guanine nucleotide-binding protein G(z) subunit alpha
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: Mu-type opioid receptor,Vasopressin V2 receptor
    • Protein or peptide: endomorphin-1
  • Ligand: water

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Supramolecule #1: Complex of endomorphin-1 bound MOR-Gz protein

SupramoleculeName: Complex of endomorphin-1 bound MOR-Gz protein / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Engineered guanine nucleotide-binding protein G(z) subunit alpha

MacromoleculeName: Engineered guanine nucleotide-binding protein G(z) subunit alpha
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.699516 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGCTLSAEDK AAVERSKMID RNLREDGEKQ RREIKLLLLG TSNSGKNTIV KQMKIIHSGG FNLEACKEYK PLIIYNAIDS LTRIIRALA ALRIDFHNPD RAYDAVQLFA LTGPAESKGE ITPELLGVMR RLWADPGAQA CFSRSSEYHL EDNAAYYLND L ERIAAADY ...String:
MGCTLSAEDK AAVERSKMID RNLREDGEKQ RREIKLLLLG TSNSGKNTIV KQMKIIHSGG FNLEACKEYK PLIIYNAIDS LTRIIRALA ALRIDFHNPD RAYDAVQLFA LTGPAESKGE ITPELLGVMR RLWADPGAQA CFSRSSEYHL EDNAAYYLND L ERIAAADY IPTVEDILRS RDMTTGIVEN KFTFKELTFK MVDVGAQRSE RKKWIHCFEG VTAIIFCVEL SGYDLKLYED NQ TSRMAAS LKLFDSICNN KWFIDTSLIL FLNKKDLLAE KIRRIPLTIC FPEYKGQNTY EEAAVYIQRQ FEDLNRNKET KEI YSHFTC STDTSNIQFV FDAVTDVIIQ NNLKYIGLC

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Macromolecule #2: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.039648 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: GPGSSGSELD QLRQEAEQLK NQIRDARKAC ADATLSQITN NIDPVGRIQM RTRRTLRGHL AKIYAMHWGT DSRLLVSASQ DGKLIIWDS YTTNKVHAIP LRSSWVMTCA YAPSGNYVAC GGLDNICSIY NLKTREGNVR VSRELAGHTG YLSCCRFLDD N QIVTSSGD ...String:
GPGSSGSELD QLRQEAEQLK NQIRDARKAC ADATLSQITN NIDPVGRIQM RTRRTLRGHL AKIYAMHWGT DSRLLVSASQ DGKLIIWDS YTTNKVHAIP LRSSWVMTCA YAPSGNYVAC GGLDNICSIY NLKTREGNVR VSRELAGHTG YLSCCRFLDD N QIVTSSGD TTCALWDIET GQQTTTFTGH TGDVMSLSLA PDTRLFVSGA CDASAKLWDV REGMCRQTFT GHESDINAIC FF PNGNAFA TGSDDATCRL FDLRADQELM TYSHDNIICG ITSVSFSKSG RLLLAGYDDF NCNVWDALKA DRAGVLAGHD NRV SCLGVT DDGMAVATGS WDSFLKIWNG SSGGGGSGGG GSSGVSGWRL FKKIS

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #4: Mu-type opioid receptor,Vasopressin V2 receptor

MacromoleculeName: Mu-type opioid receptor,Vasopressin V2 receptor / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 42.836281 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: GPMGPGNISD CSDPLAPASC SPAPGSWLNL SHVDGNQSDP CGPNRTGLGG SHSLCPQTGS PSMVTAITIM ALYSIVCVVG LFGNFLVMY VIVRYTKMKT ATNIYIFNLA LADALATSTL PFQSVNYLMG TWPFGNILCK IVISIDYYNM FTSIFTLCTM S VDRYIAVC ...String:
GPMGPGNISD CSDPLAPASC SPAPGSWLNL SHVDGNQSDP CGPNRTGLGG SHSLCPQTGS PSMVTAITIM ALYSIVCVVG LFGNFLVMY VIVRYTKMKT ATNIYIFNLA LADALATSTL PFQSVNYLMG TWPFGNILCK IVISIDYYNM FTSIFTLCTM S VDRYIAVC HPVKALDFRT PRNAKIVNVC NWILSSAIGL PVMFMATTKY RQGSIDCTLT FSHPTWYWEN LLKICVFIFA FI MPVLIIT VCYGLMILRL KSVRMLSGSK EKDRNLRRIT RMVLVVVAVF IVCWTPIHIY VIIKALITIP ETTFQTVSWH FCI ALGYTN SCLNPVLYAF LDENFKRCFR EFCICARGRT PPSLGPQDES CTTASSSLAK DTSSLEVLFQ

UniProtKB: Mu-type opioid receptor, Vasopressin V2 receptor

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Macromolecule #5: endomorphin-1

MacromoleculeName: endomorphin-1 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 609.695 Da
SequenceString:
YPWF(NH2)

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Macromolecule #6: water

MacromoleculeName: water / type: ligand / ID: 6 / Number of copies: 2 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 52.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.6 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 149926
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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