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- PDB-9ek0: Human M5 muscarinic acetylcholine receptor complex with mini-Gq a... -

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Basic information

Entry
Database: PDB / ID: 9ek0
TitleHuman M5 muscarinic acetylcholine receptor complex with mini-Gq and iperoxo
Components
  • 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
  • Guanine nucleotide-binding protein Gq alpha subunit chimera
  • Muscarinic acetylcholine receptor M5
KeywordsMEMBRANE PROTEIN / G protein-coupled receptor / acetylcholine binding / seven transmembrane protein
Function / homology
Function and homology information


regulation of phosphatidylinositol dephosphorylation / gastric acid secretion / Muscarinic acetylcholine receptors / G protein-coupled acetylcholine receptor activity / dopamine transport / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / phosphatidylinositol-4,5-bisphosphate phospholipase C activity / G-protein activation / Activation of the phototransduction cascade / Glucagon-type ligand receptors ...regulation of phosphatidylinositol dephosphorylation / gastric acid secretion / Muscarinic acetylcholine receptors / G protein-coupled acetylcholine receptor activity / dopamine transport / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / phosphatidylinositol-4,5-bisphosphate phospholipase C activity / G-protein activation / Activation of the phototransduction cascade / Glucagon-type ligand receptors / Thromboxane signalling through TP receptor / Sensory perception of sweet, bitter, and umami (glutamate) taste / G beta:gamma signalling through PI3Kgamma / G beta:gamma signalling through CDC42 / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Ca2+ pathway / G alpha (z) signalling events / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Adrenaline,noradrenaline inhibits insulin secretion / ADP signalling through P2Y purinoceptor 12 / G alpha (q) signalling events / G alpha (i) signalling events / Thrombin signalling through proteinase activated receptors (PARs) / photoreceptor outer segment membrane / spectrin binding / alkylglycerophosphoethanolamine phosphodiesterase activity / transmission of nerve impulse / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / photoreceptor outer segment / cardiac muscle cell apoptotic process / photoreceptor inner segment / 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 / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / ADP signalling through P2Y purinoceptor 12 / 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 / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / ADP signalling through P2Y purinoceptor 1 / 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 / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / positive regulation of cytosolic calcium ion concentration / cell body / 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 / cellular response to hypoxia / G alpha (q) signalling events / chemical synaptic transmission / postsynaptic membrane / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / GTPase activity / synapse / dendrite / protein-containing complex binding / extracellular exosome / membrane / plasma membrane / cytoplasm
Similarity search - Function
Muscarinic acetylcholine receptor M5 / Muscarinic acetylcholine receptor family / 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 ...Muscarinic acetylcholine receptor M5 / Muscarinic acetylcholine receptor family / 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
Chem-IXO / Muscarinic acetylcholine receptor M5 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Similarity search - Component
Biological speciesHomo sapiens (human)
Rattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.79 Å
AuthorsBurger, W.A.C. / Mobbs, J.I. / Thal, D.M.
Funding support Australia, 2items
OrganizationGrant numberCountry
National Health and Medical Research Council (NHMRC, Australia)1196951 Australia
Australian Research Council (ARC)LP180100560 Australia
CitationJournal: Nat Commun / Year: 2025
Title: Cryo-EM reveals an extrahelical allosteric binding site at the M mAChR.
Authors: Wessel A C Burger / Jesse I Mobbs / Bhavika Rana / Jinan Wang / Keya Joshi / Patrick R Gentry / Mahmuda Yeasmin / Hariprasad Venugopal / Aaron M Bender / Craig W Lindsley / Yinglong Miao / ...Authors: Wessel A C Burger / Jesse I Mobbs / Bhavika Rana / Jinan Wang / Keya Joshi / Patrick R Gentry / Mahmuda Yeasmin / Hariprasad Venugopal / Aaron M Bender / Craig W Lindsley / Yinglong Miao / Arthur Christopoulos / Celine Valant / David M Thal /
Abstract: The M muscarinic acetylcholine receptor (M mAChR) represents a promising therapeutic target for neurological disorders. However, the high conservation of its orthosteric binding site poses ...The M muscarinic acetylcholine receptor (M mAChR) represents a promising therapeutic target for neurological disorders. However, the high conservation of its orthosteric binding site poses significant challenges for drug development. While selective positive allosteric modulators (PAMs) offer a potential solution, a structural understanding of the M mAChR and its allosteric binding sites remains limited. Here, we present a 2.8 Å cryo-electron microscopy structure of the M mAChR complexed with heterotrimeric G protein and the agonist iperoxo, completing the active-state structural characterization of the mAChR family. To identify the binding site of M-selective PAMs, we implement an integrated approach combining mutagenesis, pharmacological assays, structural biology, and molecular dynamics simulations. Our mutagenesis studies reveal that selective M PAMs bind outside previously characterized M mAChR allosteric sites. Subsequently, we obtain a 2.1 Å structure of M mAChR co-bound with acetylcholine and the selective PAM VU6007678, revealing an allosteric pocket at the extrahelical interface between transmembrane domains 3 and 4 that is confirmed through mutagenesis and simulations. These findings demonstrate the diverse mechanisms of allosteric regulation in mAChRs and highlight the value of integrating pharmacological and structural approaches to identify allosteric binding sites.
History
DepositionNov 30, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 8, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
R: Muscarinic acetylcholine receptor M5
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
A: Guanine nucleotide-binding protein Gq alpha subunit chimera
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)113,5255
Polymers113,3284
Non-polymers1971
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Muscarinic acetylcholine receptor M5


Mass: 39190.051 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CHRM5 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P08912
#2: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Transducin beta chain 1


Mass: 38534.062 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Gnb1 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P54311
#3: Protein Guanine nucleotide-binding protein Gq alpha subunit chimera


Mass: 28039.793 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Trichoplusia ni (cabbage looper)
#4: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / G gamma-I


Mass: 7563.750 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNG2 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P59768
#5: Chemical ChemComp-IXO / 4-(4,5-dihydro-1,2-oxazol-3-yloxy)-N,N,N-trimethylbut-2-yn-1-aminium / Iperoxo


Mass: 197.254 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H17N2O2 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Human M5-miniGq-Gb1g2 complex / Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.21rc1_5127 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.79 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 426714 / Symmetry type: POINT
RefinementHighest resolution: 2.79 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0047189
ELECTRON MICROSCOPYf_angle_d0.7229755
ELECTRON MICROSCOPYf_dihedral_angle_d11.7652599
ELECTRON MICROSCOPYf_chiral_restr0.0491125
ELECTRON MICROSCOPYf_plane_restr0.0071229

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