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- EMDB-28826: Cryo-EM structure of Torpedo nicotinic acetylcholine receptor in ... -

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Basic information

Entry
Database: EMDB / ID: EMD-28826
TitleCryo-EM structure of Torpedo nicotinic acetylcholine receptor in complex with rocuronium, pore-blocked state
Map data
Sample
  • Complex: Cryo-EM structure of Torpedo nicotinic acetylcholine receptor in complex with rocuronium, desensitized-like state
    • Protein or peptide: Acetylcholine receptor subunit alpha
    • Protein or peptide: Acetylcholine receptor subunit delta
    • Protein or peptide: Acetylcholine receptor subunit beta
    • Protein or peptide: Acetylcholine receptor subunit gamma
  • Ligand: rocuronium
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: CHOLESTEROL
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: nonane
Keywordsacetylcholine receptor / nicotinic receptor / Torpedo / Cys-loop receptor / ion channel / muscle-type nicotinic receptor / TRANSPORT PROTEIN-INHIBITOR complex / Neuromuscular Blocker / Inhibitor
Function / homology
Function and homology information


acetylcholine-gated monoatomic cation-selective channel activity / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / transmembrane signaling receptor activity / postsynaptic membrane
Similarity search - Function
Nicotinic acetylcholine receptor / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Neurotransmitter-gated ion-channel transmembrane domain superfamily / Neuronal acetylcholine receptor / Neurotransmitter-gated ion-channel / Neurotransmitter-gated ion-channel ligand-binding domain / Neurotransmitter-gated ion-channel ligand-binding domain superfamily / Neurotransmitter-gated ion-channel ligand binding domain
Similarity search - Domain/homology
Acetylcholine receptor subunit alpha / Acetylcholine receptor subunit beta / Acetylcholine receptor subunit gamma / Acetylcholine receptor subunit delta
Similarity search - Component
Biological speciesTetronarce californica (Pacific electric ray)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsGoswami U / Rahman MM / Teng J / Hibbs RE
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA) United States
CitationJournal: Nat Commun / Year: 2023
Title: Structural interplay of anesthetics and paralytics on muscle nicotinic receptors.
Authors: Umang Goswami / Md Mahfuzur Rahman / Jinfeng Teng / Ryan E Hibbs /
Abstract: General anesthetics and neuromuscular blockers are used together during surgery to stabilize patients in an unconscious state. Anesthetics act mainly by potentiating inhibitory ion channels and ...General anesthetics and neuromuscular blockers are used together during surgery to stabilize patients in an unconscious state. Anesthetics act mainly by potentiating inhibitory ion channels and inhibiting excitatory ion channels, with the net effect of dampening nervous system excitability. Neuromuscular blockers act by antagonizing nicotinic acetylcholine receptors at the motor endplate; these excitatory ligand-gated ion channels are also inhibited by general anesthetics. The mechanisms by which anesthetics and neuromuscular blockers inhibit nicotinic receptors are poorly understood but underlie safe and effective surgeries. Here we took a direct structural approach to define how a commonly used anesthetic and two neuromuscular blockers act on a muscle-type nicotinic receptor. We discover that the intravenous anesthetic etomidate binds at an intrasubunit site in the transmembrane domain and stabilizes a non-conducting, desensitized-like state of the channel. The depolarizing neuromuscular blocker succinylcholine also stabilizes a desensitized channel but does so through binding to the classical neurotransmitter site. Rocuronium binds in this same neurotransmitter site but locks the receptor in a resting, non-conducting state. Together, this study reveals a structural mechanism for how general anesthetics work on excitatory nicotinic receptors and further rationalizes clinical observations in how general anesthetics and neuromuscular blockers interact.
History
DepositionNov 8, 2022-
Header (metadata) releaseJun 7, 2023-
Map releaseJun 7, 2023-
UpdateMay 14, 2025-
Current statusMay 14, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_28826.png

Downloads & links

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Map

FileDownload / File: emd_28826.map.gz / Format: CCP4 / Size: 91.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 288 pix.
= 307.987 Å		1.07 Å/pix.
x 288 pix.
= 307.987 Å		1.07 Å/pix.
x 288 pix.
= 307.987 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.0694 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0154
Minimum - Maximum-0.025856756 - 0.07566291
Average (Standard dev.)0.00013512923 (±0.0024483907)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 307.98718 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_28826_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_28826_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : Cryo-EM structure of Torpedo nicotinic acetylcholine receptor in ...

EntireName: Cryo-EM structure of Torpedo nicotinic acetylcholine receptor in complex with rocuronium, desensitized-like state
Components
  • Complex: Cryo-EM structure of Torpedo nicotinic acetylcholine receptor in complex with rocuronium, desensitized-like state
    • Protein or peptide: Acetylcholine receptor subunit alpha
    • Protein or peptide: Acetylcholine receptor subunit delta
    • Protein or peptide: Acetylcholine receptor subunit beta
    • Protein or peptide: Acetylcholine receptor subunit gamma
  • Ligand: rocuronium
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
  • Ligand: CHOLESTEROL
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: nonane

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Supramolecule #1: Cryo-EM structure of Torpedo nicotinic acetylcholine receptor in ...

SupramoleculeName: Cryo-EM structure of Torpedo nicotinic acetylcholine receptor in complex with rocuronium, desensitized-like state
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Tetronarce californica (Pacific electric ray)

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Macromolecule #1: Acetylcholine receptor subunit alpha

MacromoleculeName: Acetylcholine receptor subunit alpha / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Tetronarce californica (Pacific electric ray)
Molecular weightTheoretical: 49.766793 KDa
SequenceString: SEHETRLVAN LLENYNKVIR PVEHHTHFVD ITVGLQLIQL ISVDEVNQIV ETNVRLRQQW IDVRLRWNPA DYGGIKKIRL PSDDVWLPD LVLYNNADGD FAIVHMTKLL LDYTGKIMWT PPAIFKSYCE IIVTHFPFDQ QNCTMKLGIW TYDGTKVSIS P ESDRPDLS ...String:
SEHETRLVAN LLENYNKVIR PVEHHTHFVD ITVGLQLIQL ISVDEVNQIV ETNVRLRQQW IDVRLRWNPA DYGGIKKIRL PSDDVWLPD LVLYNNADGD FAIVHMTKLL LDYTGKIMWT PPAIFKSYCE IIVTHFPFDQ QNCTMKLGIW TYDGTKVSIS P ESDRPDLS TFMESGEWVM KDYRGWKHWV YYTCCPDTPY LDITYHFIMQ RIPLYFVVNV IIPCLLFSFL TGLVFYLPTD SG EKMTLSI SVLLSLTVFL LVIVELIPST SSAVPLIGKY MLFTMIFVIS SIIITVVVIN THHRSPSTHT MPQWVRKIFI DTI PNVMFF STMKRASKEK QENKIFADDI DISDISGKQV TGEVIFQTPL IKNPDVKSAI EGVKYIAEHM KSDEESSNAA EEWK YVAMV IDHILLCVFM LICIIGTVSV FAGRLIEL

UniProtKB: Acetylcholine receptor subunit alpha

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Macromolecule #2: Acetylcholine receptor subunit delta

MacromoleculeName: Acetylcholine receptor subunit delta / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Tetronarce californica (Pacific electric ray)
Molecular weightTheoretical: 57.554633 KDa
SequenceString: VNEEERLIND LLIVNKYNKH VRPVKHNNEV VNIALSLTLS NLISLKETDE TLTSNVWMDH AWYDHRLTWN ASEYSDISIL RLPPELVWI PDIVLQNNND GQYHVAYFCN VLVRPNGYVT WLPPAIFRSS CPINVLYFPF DWQNCSLKFT ALNYDANEIT M DLMTDTID ...String:
VNEEERLIND LLIVNKYNKH VRPVKHNNEV VNIALSLTLS NLISLKETDE TLTSNVWMDH AWYDHRLTWN ASEYSDISIL RLPPELVWI PDIVLQNNND GQYHVAYFCN VLVRPNGYVT WLPPAIFRSS CPINVLYFPF DWQNCSLKFT ALNYDANEIT M DLMTDTID GKDYPIEWII IDPEAFTENG EWEIIHKPAK KNIYPDKFPN GTNYQDVTFY LIIRRKPLFY VINFITPCVL IS FLASLAF YLPAESGEKM STAISVLLAQ AVFLLLTSQR LPETALAVPL IGKYLMFIMS LVTGVIVNCG IVLNFHFRTP STH VLSTRV KQIFLEKLPR ILHMSRADES EQPDWQNDLK LRRSSSVGYI SKAQEYFNIK SRSELMFEKQ SERHGLVPRV TPRI GFGNN NENIAASDQL HDEIKSGIDS TNYIVKQIKE KNAYDEEVGN WNLVGQTIDR LSMFIITPVM VLGTIFIFVM GNFNH PPAK PFEGDPFDYS SDHPRC

UniProtKB: Acetylcholine receptor subunit delta

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Macromolecule #3: Acetylcholine receptor subunit beta

MacromoleculeName: Acetylcholine receptor subunit beta / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Tetronarce californica (Pacific electric ray)
Molecular weightTheoretical: 53.731773 KDa
SequenceString: SVMEDTLLSV LFETYNPKVR PAQTVGDKVT VRVGLTLTNL LILNEKIEEM TTNVFLNLAW TDYRLQWDPA AYEGIKDLRI PSSDVWQPD IVLMNNNDGS FEITLHVNVL VQHTGAVSWQ PSAIYRSSCT IKVMYFPFDW QNCTMVFKSY TYDTSEVTLQ H ALDAKGER ...String:
SVMEDTLLSV LFETYNPKVR PAQTVGDKVT VRVGLTLTNL LILNEKIEEM TTNVFLNLAW TDYRLQWDPA AYEGIKDLRI PSSDVWQPD IVLMNNNDGS FEITLHVNVL VQHTGAVSWQ PSAIYRSSCT IKVMYFPFDW QNCTMVFKSY TYDTSEVTLQ H ALDAKGER EVKEIVINKD AFTENGQWSI EHKPSRKNWR SDDPSYEDVT FYLIIQRKPL FYIVYTIIPC ILISILAILV FY LPPDAGE KMSLSISALL AVTVFLLLLA DKVPETSLSV PIIIRYLMFI MILVAFSVIL SVVVLNLHHR SPNTHTMPNW IRQ IFIETL PPFLWIQRPV TTPSPDSKPT IISRANDEYF IRKPAGDFVC PVDNARVAVQ PERLFSEMKW HLNGLTQPVT LPQD LKEAV EAIKYIAEQL ESASEFDDLK KDWQYVAMVA DRLFLYVFFV ICSIGTFSIF LDASHNVPPD NPFA

UniProtKB: Acetylcholine receptor subunit beta

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Macromolecule #4: Acetylcholine receptor subunit gamma

MacromoleculeName: Acetylcholine receptor subunit gamma / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Tetronarce californica (Pacific electric ray)
Molecular weightTheoretical: 56.335684 KDa
SequenceString: ENEEGRLIEK LLGDYDKRII PAKTLDHIID VTLKLTLTNL ISLNEKEEAL TTNVWIEIQW NDYRLSWNTS EYEGIDLVRI PSELLWLPD VVLENNVDGQ FEVAYYANVL VYNDGSMYWL PPAIYRSTCP IAVTYFPFDW QNCSLVFRSQ TYNAHEVNLQ L SAEEGEAV ...String:
ENEEGRLIEK LLGDYDKRII PAKTLDHIID VTLKLTLTNL ISLNEKEEAL TTNVWIEIQW NDYRLSWNTS EYEGIDLVRI PSELLWLPD VVLENNVDGQ FEVAYYANVL VYNDGSMYWL PPAIYRSTCP IAVTYFPFDW QNCSLVFRSQ TYNAHEVNLQ L SAEEGEAV EWIHIDPEDF TENGEWTIRH RPAKKNYNWQ LTKDDTDFQE IIFFLIIQRK PLFYIINIIA PCVLISSLVV LV YFLPAQA GGQKCTLSIS VLLAQTIFLF LIAQKVPETS LNVPLIGKYL IFVMFVSMLI VMNCVIVLNV SLRTPNTHSL SEK IKHLFL GFLPKYLGMQ LEPSEETPEK PQPRRRSSFG IMIKAEEYIL KKPRSELMFE EQKDRHGLKR VNKMTSDIDI GTTV DLYKD LANFAPEIKS CVEACNFIAK STKEQNDSGS ENENWVLIGK VIDKACFWIA LLLFSIGTLA IFLTGHFNQV PEFPF PGDP RKYVP

UniProtKB: Acetylcholine receptor subunit gamma

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Macromolecule #9: rocuronium

MacromoleculeName: rocuronium / type: ligand / ID: 9 / Number of copies: 3 / Formula: RBR
Molecular weightTheoretical: 529.774 Da
Chemical component information

ChemComp-RBR:
rocuronium

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Macromolecule #10: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(tri...

MacromoleculeName: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
type: ligand / ID: 10 / Number of copies: 6 / Formula: POV
Molecular weightTheoretical: 760.076 Da
Chemical component information

ChemComp-POV:
(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / phospholipid*YM

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Macromolecule #11: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 11 / Number of copies: 3 / Formula: CLR
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL

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Macromolecule #12: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 12 / Number of copies: 3 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #13: nonane

MacromoleculeName: nonane / type: ligand / ID: 13 / Number of copies: 1 / Formula: DD9
Molecular weightTheoretical: 128.255 Da
Chemical component information

ChemComp-DD9:
nonane

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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

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 0.5 µm / Nominal defocus min: 2.5 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: RELION (ver. 3.1) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER / Details: De novo initial model from RELION
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 181353
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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