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- PDB-9kqe: Cryo-EM structure of human VMAT2 in complex with dopamine. -

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Basic information

Entry
Database: PDB / ID: 9kqe
TitleCryo-EM structure of human VMAT2 in complex with dopamine.
ComponentsSoluble cytochrome b562,Synaptic vesicular amine transporter
KeywordsMEMBRANE PROTEIN / transporter / VMAT2
Function / homology
Function and homology information


serotonin secretion by mast cell / somato-dendritic dopamine secretion / histamine uptake / aminergic neurotransmitter loading into synaptic vesicle / neurotransmitter loading into synaptic vesicle / monoamine:proton antiporter activity / clathrin-sculpted monoamine transport vesicle membrane / Serotonin Neurotransmitter Release Cycle / serotonin:sodium:chloride symporter activity / Dopamine Neurotransmitter Release Cycle ...serotonin secretion by mast cell / somato-dendritic dopamine secretion / histamine uptake / aminergic neurotransmitter loading into synaptic vesicle / neurotransmitter loading into synaptic vesicle / monoamine:proton antiporter activity / clathrin-sculpted monoamine transport vesicle membrane / Serotonin Neurotransmitter Release Cycle / serotonin:sodium:chloride symporter activity / Dopamine Neurotransmitter Release Cycle / Norepinephrine Neurotransmitter Release Cycle / serotonin uptake / dopamine transport / monoamine transmembrane transporter activity / histamine secretion by mast cell / monoamine transport / dopaminergic synapse / SLC-mediated transport of neurotransmitters / neurotransmitter transport / negative regulation of reactive oxygen species biosynthetic process / secretory granule membrane / response to amphetamine / post-embryonic development / locomotory behavior / electron transport chain / response to toxic substance / terminal bouton / synaptic vesicle / synaptic vesicle membrane / chemical synaptic transmission / periplasmic space / electron transfer activity / iron ion binding / axon / intracellular membrane-bounded organelle / heme binding / dendrite / centrosome / membrane / plasma membrane
Similarity search - Function
: / Major facilitator superfamily / Major Facilitator Superfamily / Major facilitator superfamily domain / Major facilitator superfamily (MFS) profile. / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / MFS transporter superfamily
Similarity search - Domain/homology
L-DOPAMINE / Soluble cytochrome b562 / Synaptic vesicular amine transporter
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsWei, F. / Zhang, W. / Zhang, Y.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nat Commun / Year: 2025
Title: Drug inhibition and substrate transport mechanisms of human VMAT2.
Authors: Feiwen Wei / Huihui Liu / Wei Zhang / Jufang Wang / Yanqing Zhang /
Abstract: Vesicular monoamine transporter 2 (VMAT2) is crucial for packaging monoamine neurotransmitters into synaptic vesicles, with their dysregulation linked to schizophrenia, mood disorders, and ...Vesicular monoamine transporter 2 (VMAT2) is crucial for packaging monoamine neurotransmitters into synaptic vesicles, with their dysregulation linked to schizophrenia, mood disorders, and Parkinson's disease. Tetrabenazine (TBZ) and valbenazine (VBZ), both FDA-approved VMAT2 inhibitors, are employed to treat chorea and tardive dyskinesia (TD). Our study presents the structures of VMAT2 bound to substrates serotonin (5-HT) and dopamine (DA), as well as the inhibitors TBZ and VBZ. Utilizing cryo-electron microscopy (cryo-EM), mutagenesis functional assays, and molecular dynamics (MD) simulations, we elucidate the mechanisms of substrate transport and drug inhibition. Our MD simulations indicate potential binding poses of substrate (5-HT) in both cytosol-facing and lumen-facing states, emphasizing the significance of protonation of key acidic residues for substrate release. We demonstrate that TBZ locks VMAT2 in a lumen-facing occluded state, while VBZ stabilizes it in a lumen-facing conformation. These insights enhance our understanding of VMAT2 function and provide valuable insights for the development of novel therapeutic strategies for psychiatric disorders.
History
DepositionNov 25, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jan 15, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Soluble cytochrome b562,Synaptic vesicular amine transporter
hetero molecules


Theoretical massNumber of molelcules
Total (without water)69,2802
Polymers69,1271
Non-polymers1531
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Soluble cytochrome b562,Synaptic vesicular amine transporter / Cytochrome b-562 / Monoamine transporter / Solute carrier family 18 member 2 / Vesicular amine ...Cytochrome b-562 / Monoamine transporter / Solute carrier family 18 member 2 / Vesicular amine transporter 2 / VAT2


Mass: 69127.070 Da / Num. of mol.: 1 / Mutation: M8W,H103I,R107L
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli), (gene. exp.) Homo sapiens (human)
Gene: cybC, SLC18A2, SVMT, VMAT2 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P0ABE7, UniProt: Q05940
#2: Chemical ChemComp-LDP / L-DOPAMINE / DOPAMINE


Mass: 153.178 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C8H11NO2 / Feature type: SUBJECT OF INVESTIGATION / Comment: medication*YM
Has ligand of interestY
Has protein modificationN

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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: VMAT2 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21Homo sapiens (human)9606
31Escherichia coli (E. coli)562
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenConc.: 10 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 281 K

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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: 1600 nm / Nominal defocus min: 900 nm
Image recordingElectron dose: 49.5 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.17.1_3660 / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 277370 / Symmetry type: POINT
RefinementStereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0072865
ELECTRON MICROSCOPYf_angle_d0.7183896
ELECTRON MICROSCOPYf_dihedral_angle_d4.613393
ELECTRON MICROSCOPYf_chiral_restr0.044465
ELECTRON MICROSCOPYf_plane_restr0.005476

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