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- EMDB-70553: 21bin20S complex (NSF-alphaSNAP-2:1 syntaxin-1a:SNAP-25), 3:2:1 a... -

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Basic information

Entry
Database: EMDB / ID: EMD-70553
Title21bin20S complex (NSF-alphaSNAP-2:1 syntaxin-1a:SNAP-25), 3:2:1 alphaSNAP-syntaxin-1a-SNAP-25 subcomplex local refinement, non-hydrolyzing, class 13
Map dataSharpened map from cryoSPARC local_refine_new, B = 221.1
Sample
  • Complex: The 21bin20S complex of NSF, alphaSNAP, and the soluble 2:1 binary SNARE complex of syntaxin-1a and SNAP-25
    • Complex: Subcomplex of alphaSNAP, syntaxin-1a, and SNAP-25
      • Complex: 2:1 binary complex of SNAP-25 and syntaxin-1a
        • Protein or peptide: Syntaxin-1A
        • Protein or peptide: Synaptosomal-associated protein 25
      • Protein or peptide: Alpha-soluble NSF attachment protein
    • Complex: Homohexameric NSF
KeywordsATPase / SNARE / hydrolysis / disassembly / translocation / exocytosis / neurotransmitter release / synapse / synaptic transmission / membrane fusion / HYDROLASE
Function / homology
Function and homology information


soluble NSF attachment protein activity / Intra-Golgi traffic / Retrograde transport at the Trans-Golgi-Network / COPI-dependent Golgi-to-ER retrograde traffic / COPI-mediated anterograde transport / BLOC-1 complex / myosin head/neck binding / SNARE complex disassembly / synaptic vesicle fusion to presynaptic active zone membrane / Other interleukin signaling ...soluble NSF attachment protein activity / Intra-Golgi traffic / Retrograde transport at the Trans-Golgi-Network / COPI-dependent Golgi-to-ER retrograde traffic / COPI-mediated anterograde transport / BLOC-1 complex / myosin head/neck binding / SNARE complex disassembly / synaptic vesicle fusion to presynaptic active zone membrane / Other interleukin signaling / synaptobrevin 2-SNAP-25-syntaxin-1a-complexin II complex / synaptobrevin 2-SNAP-25-syntaxin-1a complex / presynaptic dense core vesicle exocytosis / synaptobrevin 2-SNAP-25-syntaxin-1a-complexin I complex / extrinsic component of presynaptic membrane / calcium ion-regulated exocytosis of neurotransmitter / Glutamate Neurotransmitter Release Cycle / Norepinephrine Neurotransmitter Release Cycle / Acetylcholine Neurotransmitter Release Cycle / Serotonin Neurotransmitter Release Cycle / COPII-mediated vesicle transport / GABA synthesis, release, reuptake and degradation / regulated exocytosis / positive regulation of norepinephrine secretion / positive regulation of catecholamine secretion / Dopamine Neurotransmitter Release Cycle / synaptic vesicle docking / Golgi Associated Vesicle Biogenesis / regulation of synaptic vesicle priming / regulation of establishment of protein localization / Insertion of tail-anchored proteins into the endoplasmic reticulum membrane / protein-containing complex disassembly / positive regulation of calcium ion-dependent exocytosis / vesicle docking / ribbon synapse / secretion by cell / regulation of exocytosis / SNAP receptor activity / chloride channel inhibitor activity / SNARE complex / vesicle fusion / calcium-ion regulated exocytosis / actomyosin / LGI-ADAM interactions / hormone secretion / positive regulation of hormone secretion / positive regulation of ATP-dependent activity / ATP-dependent protein binding / neurotransmitter secretion / apical protein localization / protein localization to membrane / syntaxin binding / syntaxin-1 binding / insulin secretion / endosomal transport / Neutrophil degranulation / SNARE complex assembly / positive regulation of neurotransmitter secretion / neurotransmitter transport / synaptic vesicle priming / regulation of synapse assembly / response to gravity / myosin binding / regulation of neuron projection development / exocytosis / modulation of excitatory postsynaptic potential / positive regulation of exocytosis / synaptic vesicle exocytosis / associative learning / protein sumoylation / synaptic vesicle endocytosis / voltage-gated potassium channel activity / positive regulation of excitatory postsynaptic potential / long-term memory / axonal growth cone / calcium channel inhibitor activity / presynaptic active zone membrane / photoreceptor inner segment / voltage-gated potassium channel complex / somatodendritic compartment / endomembrane system / axonogenesis / secretory granule / acrosomal vesicle / SNARE binding / synaptic transmission, glutamatergic / filopodium / intracellular protein transport / locomotory behavior / trans-Golgi network / postsynaptic density membrane / brain development / neuromuscular junction / positive regulation of insulin secretion / kinase binding / Schaffer collateral - CA1 synapse / long-term synaptic potentiation / terminal bouton / neuron differentiation / calcium-dependent protein binding
Similarity search - Function
NSF attachment protein / Soluble NSF attachment protein, SNAP / Synaptosomal-associated protein 25 / SNAP-25 domain / SNAP-25 family / Syntaxin / Syntaxin N-terminal domain / Syntaxin, N-terminal domain / SNARE domain / Syntaxin ...NSF attachment protein / Soluble NSF attachment protein, SNAP / Synaptosomal-associated protein 25 / SNAP-25 domain / SNAP-25 family / Syntaxin / Syntaxin N-terminal domain / Syntaxin, N-terminal domain / SNARE domain / Syntaxin / Syntaxin/epimorphin, conserved site / Syntaxin / epimorphin family signature. / SNARE / Helical region found in SNAREs / t-SNARE coiled-coil homology domain profile. / Target SNARE coiled-coil homology domain / Tetratricopeptide-like helical domain superfamily
Similarity search - Domain/homology
Syntaxin-1A / Alpha-soluble NSF attachment protein / Synaptosomal-associated protein 25
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat) / Cricetulus griseus (Chinese hamster)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.74 Å
AuthorsWhite KI / Brunger AT
Funding support United States, 3 items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
Helen Hay Whitney Foundation United States
National Institutes of Health/National Institute of Mental Health (NIH/NIMH)MH063105 United States
CitationJournal: bioRxiv / Year: 2024
Title: Pre-fusion AAA+ remodeling of target-SNARE protein complexes enables synaptic transmission.
Authors: K Ian White / Yousuf A Khan / Kangqiang Qiu / Ashwin Balaji / Sergio Couoh-Cardel / Luis Esquivies / Richard A Pfuetzner / Jiajie Diao / Axel T Brunger
Abstract: Membrane fusion is driven by SNARE complex formation across cellular contexts, including vesicle fusion during synaptic transmission. Multiple proteins organize trans-SNARE complex assembly and ...Membrane fusion is driven by SNARE complex formation across cellular contexts, including vesicle fusion during synaptic transmission. Multiple proteins organize trans-SNARE complex assembly and priming, leading to fusion. One target membrane SNARE, syntaxin, forms nanodomains at the active zone, and another, SNAP-25, enters non-fusogenic complexes with it. Here, we show that the AAA+ protein NSF (N-ethylmaleimide sensitive factor) and SNAP (soluble NSF attachment protein) must act prior to fusion. We show that syntaxin clusters are conserved, that NSF colocalizes with them, and characterize SNARE populations within and near these clusters using cryo-EM. Supercomplexes of NSF, α-SNAP, and either a syntaxin tetramer or two binary complexes of syntaxin-SNAP-25 reveal atomic details of SNARE processing and show how sequential ATP hydrolysis drives disassembly. These results suggest a functional role for syntaxin clusters as reservoirs and a corresponding role for NSF in syntaxin liberation and SNARE protein quality control preceding fusion.
History
DepositionMay 8, 2025-
Header (metadata) releaseAug 6, 2025-
Map releaseAug 6, 2025-
UpdateAug 6, 2025-
Current statusAug 6, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_70553.png

Downloads & links

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Map

FileDownload / File: emd_70553.map.gz / Format: CCP4 / Size: 96.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationSharpened map from cryoSPARC local_refine_new, B = 221.1
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 294 pix.
= 322.224 Å		1.1 Å/pix.
x 294 pix.
= 322.224 Å		1.1 Å/pix.
x 294 pix.
= 322.224 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.096 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.3
Minimum - Maximum-3.0352507 - 2.8348799
Average (Standard dev.)0.0017188492 (±0.048371036)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions294294294
Spacing294294294
CellA=B=C: 322.224 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: Unsharpened map from cryoSPARC local refine new

Fileemd_70553_additional_1.map
AnnotationUnsharpened map from cryoSPARC local_refine_new
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map A from cryoSPARC local refine new

Fileemd_70553_half_map_1.map
AnnotationHalf map A from cryoSPARC local_refine_new
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map B from cryoSPARC local refine new

Fileemd_70553_half_map_2.map
AnnotationHalf map B from cryoSPARC local_refine_new
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : The 21bin20S complex of NSF, alphaSNAP, and the soluble 2:1 binar...

EntireName: The 21bin20S complex of NSF, alphaSNAP, and the soluble 2:1 binary SNARE complex of syntaxin-1a and SNAP-25
Components
  • Complex: The 21bin20S complex of NSF, alphaSNAP, and the soluble 2:1 binary SNARE complex of syntaxin-1a and SNAP-25
    • Complex: Subcomplex of alphaSNAP, syntaxin-1a, and SNAP-25
      • Complex: 2:1 binary complex of SNAP-25 and syntaxin-1a
        • Protein or peptide: Syntaxin-1A
        • Protein or peptide: Synaptosomal-associated protein 25
      • Protein or peptide: Alpha-soluble NSF attachment protein
    • Complex: Homohexameric NSF

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Supramolecule #1: The 21bin20S complex of NSF, alphaSNAP, and the soluble 2:1 binar...

SupramoleculeName: The 21bin20S complex of NSF, alphaSNAP, and the soluble 2:1 binary SNARE complex of syntaxin-1a and SNAP-25
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all

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Supramolecule #2: Subcomplex of alphaSNAP, syntaxin-1a, and SNAP-25

SupramoleculeName: Subcomplex of alphaSNAP, syntaxin-1a, and SNAP-25 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: all
Source (natural)Organism: Rattus norvegicus (Norway rat)

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Supramolecule #3: Homohexameric NSF

SupramoleculeName: Homohexameric NSF / type: complex / ID: 3 / Parent: 1
Source (natural)Organism: Cricetulus griseus (Chinese hamster)

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Supramolecule #4: 2:1 binary complex of SNAP-25 and syntaxin-1a

SupramoleculeName: 2:1 binary complex of SNAP-25 and syntaxin-1a / type: complex / ID: 4 / Parent: 2 / Macromolecule list: #1-#2
Source (natural)Organism: Rattus norvegicus (Norway rat)

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Macromolecule #1: Syntaxin-1A

MacromoleculeName: Syntaxin-1A / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 31.045934 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MKDRTQELRT AKDSDDDDDV TVTVDRDRFM DEFFEQVEEI RGFIDKIAEN VEEVKRKHSA ILASPNPDEK TKEELEELMS DIKKTANKV RSKLKSIEQS IEQEEGLNRS SADLRIRKTQ HSTLSRKFVE VMSEYNATQS DYRERCKGRI QRQLEITGRT T TSEELEDM ...String:
MKDRTQELRT AKDSDDDDDV TVTVDRDRFM DEFFEQVEEI RGFIDKIAEN VEEVKRKHSA ILASPNPDEK TKEELEELMS DIKKTANKV RSKLKSIEQS IEQEEGLNRS SADLRIRKTQ HSTLSRKFVE VMSEYNATQS DYRERCKGRI QRQLEITGRT T TSEELEDM LESGNPAIFA SGIIMDSSIS KQALSEIETR HSEIIKLENS IRELHDMFMD MAMLVESQGE MIDRIEYNVE HA VDYVERA VSDTKKAVKY QSKARRKKIM

UniProtKB: Syntaxin-1A

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Macromolecule #2: Synaptosomal-associated protein 25

MacromoleculeName: Synaptosomal-associated protein 25 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 25.036746 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MGSSHHHHHH SQDPNSMAED ADMRNELEEM QRRADQLADE SLESTRRMLQ LVEESKDAGI RTLVMLDEQG EQLERIEEGM DQINKDMKE AEKNLTDLGK FAGLAVAPAN KLKSSDAYKK AWGNNQDGVV ASQPARVVDE REQMAISGGF IRRVTNDARE N EMDENLEQ ...String:
MGSSHHHHHH SQDPNSMAED ADMRNELEEM QRRADQLADE SLESTRRMLQ LVEESKDAGI RTLVMLDEQG EQLERIEEGM DQINKDMKE AEKNLTDLGK FAGLAVAPAN KLKSSDAYKK AWGNNQDGVV ASQPARVVDE REQMAISGGF IRRVTNDARE N EMDENLEQ VSGIIGNLRH MALDMGNEID TQNRQIDRIM EKADSNKTRI DEANQRATKM LGSG

UniProtKB: Synaptosomal-associated protein 25

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Macromolecule #3: Alpha-soluble NSF attachment protein

MacromoleculeName: Alpha-soluble NSF attachment protein / type: protein_or_peptide / ID: 3 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 33.290715 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: GMDTSGKQAE AMALLAEAER KVKNSQSFFS GLFGGSSKIE EACEIYARAA NMFKMAKNWS AAGNAFCQAA QLHLQLQSKH DAATCFVDA GNAFKKADPQ EAINCLMRAI EIYTDMGRFT IAAKHHISIA EIYETELVDV EKAIAHYEQS ADYYKGEESN S SANKCLLK ...String:
GMDTSGKQAE AMALLAEAER KVKNSQSFFS GLFGGSSKIE EACEIYARAA NMFKMAKNWS AAGNAFCQAA QLHLQLQSKH DAATCFVDA GNAFKKADPQ EAINCLMRAI EIYTDMGRFT IAAKHHISIA EIYETELVDV EKAIAHYEQS ADYYKGEESN S SANKCLLK VAGYAAQLEQ YQKAIDIYEQ VGTSAMDSPL LKYSAKDYFF KAALCHFCID MLNAKLAVQK YEELFPAFSD SR ECKLMKK LLEAHEEQNV DSYTESVKEY DSISRLDQWL TTMLLRIKKT IQGDEEDLR

UniProtKB: Alpha-soluble NSF attachment protein

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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

Concentration15 mg/mL
BufferpH: 8
Component:
ConcentrationNameFormula
50.0 mMTris-HCl
150.0 mMsodium chlorideNaCl
1.0 mMEDTA
1.0 mMadenosine triphosphate
1.0 mMTCEP
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 200 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 45 sec. / Pretreatment - Atmosphere: OTHER
Details: 15 mA with PELCO easiGlow Glow Discharge Cleaning System
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recording#0 - Image recording ID: 1 / #0 - Film or detector model: GATAN K3 (6k x 4k) / #0 - Average electron dose: 31.56 e/Å2 / #1 - Image recording ID: 2 / #1 - Film or detector model: GATAN K3 (6k x 4k) / #1 - Average electron dose: 36.76 e/Å2 / #2 - Image recording ID: 3 / #2 - Film or detector model: GATAN K3 (6k x 4k) / #2 - Average electron dose: 35.48 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 22500
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Image recording ID1
Particle selectionNumber selected: 2817313
CTF correctionSoftware: (Name: CTFFIND (ver. 4), RELION (ver. 3.1.4)) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionAlgorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 3.74 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3.2.0) / Software - details: local_refine_new / Number images used: 965222
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1.4)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.2.0) / Software - details: local_refine_new
Final 3D classificationSoftware - Name: RELION (ver. 3.1.4)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6mdm


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-9ok3:
21bin20S complex (NSF-alphaSNAP-2:1 syntaxin-1a:SNAP-25), 3:2:1 alphaSNAP-syntaxin-1a-SNAP-25 subcomplex local refinement, non-hydrolyzing, class 13

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