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- PDB-8xn1: Cryo-EM structure of human ZnT3, in the presence of zinc, determi... -

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Basic information

Entry
Database: PDB / ID: 8xn1
TitleCryo-EM structure of human ZnT3, in the presence of zinc, determined in an inward-facing conformation
ComponentsProbable proton-coupled zinc antiporter SLC30A3
KeywordsTRANSPORT PROTEIN / Human ZnT3 / Zinc transpoter / inward- facing conformation / transport ptotein.
Function / homology
Function and homology information


zinc ion import into synaptic vesicle / positive regulation of transport / hippocampal mossy fiber / zinc ion import into lysosome / Zinc efflux and compartmentalization by the SLC30 family / microvesicle / zinc ion transmembrane transporter activity / zinc ion transmembrane transport / antiporter activity / response to zinc ion ...zinc ion import into synaptic vesicle / positive regulation of transport / hippocampal mossy fiber / zinc ion import into lysosome / Zinc efflux and compartmentalization by the SLC30 family / microvesicle / zinc ion transmembrane transporter activity / zinc ion transmembrane transport / antiporter activity / response to zinc ion / hippocampal mossy fiber to CA3 synapse / synaptic vesicle membrane / late endosome membrane / late endosome / synaptic vesicle / neuron projection / lysosomal membrane / glutamatergic synapse / metal ion binding / plasma membrane / cytoplasm
Similarity search - Function
: / Cation efflux protein, cytoplasmic domain superfamily / Cation efflux protein / Cation efflux transmembrane domain superfamily / Cation efflux family
Similarity search - Domain/homology
: / Lauryl Maltose Neopentyl Glycol / CHOLESTEROL HEMISUCCINATE / Probable proton-coupled zinc antiporter SLC30A3
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.14 Å
AuthorsZhu, Z. / Qu, Q. / Long, Y. / Zhou, Z.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32171194 China
CitationJournal: EMBO Rep / Year: 2024
Title: Structural insights into human zinc transporter ZnT1 mediated Zn efflux.
Authors: Yonghui Long / Zhini Zhu / Zixuan Zhou / Chuanhui Yang / Yulin Chao / Yuwei Wang / Qingtong Zhou / Ming-Wei Wang / Qianhui Qu /
Abstract: Zinc transporter 1 (ZnT1), the principal carrier of cytosolic zinc to the extracellular milieu, is important for cellular zinc homeostasis and resistance to zinc toxicity. Despite recent advancements ...Zinc transporter 1 (ZnT1), the principal carrier of cytosolic zinc to the extracellular milieu, is important for cellular zinc homeostasis and resistance to zinc toxicity. Despite recent advancements in the structural characterization of various zinc transporters, the mechanism by which ZnTs-mediated Zn translocation is coupled with H or Ca remains unclear. To visualize the transport dynamics, we determined the cryo-electron microscopy (cryo-EM) structures of human ZnT1 at different functional states. ZnT1 dimerizes via extensive interactions between the cytosolic (CTD), the transmembrane (TMD), and the unique cysteine-rich extracellular (ECD) domains. At pH 7.5, both protomers adopt an outward-facing (OF) conformation, with Zn ions coordinated at the TMD binding site by distinct compositions. At pH 6.0, ZnT1 complexed with Zn exhibits various conformations [OF/OF, OF/IF (inward-facing), and IF/IF]. These conformational snapshots, together with biochemical investigation and molecular dynamic simulations, shed light on the mechanism underlying the proton-dependence of ZnT1 transport.
History
DepositionDec 28, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Oct 30, 2024Provider: repository / Type: Initial release
Revision 1.1Nov 27, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Probable proton-coupled zinc antiporter SLC30A3
B: Probable proton-coupled zinc antiporter SLC30A3
hetero molecules


Theoretical massNumber of molelcules
Total (without water)89,33213
Polymers85,2052
Non-polymers4,12711
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 Probable proton-coupled zinc antiporter SLC30A3 / Solute carrier family 30 member 3 / Zinc transporter 3 / ZnT-3


Mass: 42602.523 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SLC30A3, ZNT3 / Cell (production host): 293F / Cell line (production host): HEK293F / Production host: Homo sapiens (human) / References: UniProt: Q99726
#2: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-Y01 / CHOLESTEROL HEMISUCCINATE


Mass: 486.726 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C31H50O4 / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-AV0 / Lauryl Maltose Neopentyl Glycol / 2,2-didecylpropane-1,3-bis-b-D-maltopyranoside / 2-decyl-2-{[(4-O-alpha-D-glucopyranosyl-beta-D-glucopyranosyl)oxy]methyl}dodecyl4-O-alpha-D-glucopyranosyl-beta-D-glucopyranoside


Mass: 1005.188 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C47H88O22 / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-A1L42 / (1S)-2-{[{[(2R)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL STEARATE / [(2~{S})-3-[[(2~{R})-2,3-bis(oxidanyl)propoxy]-oxidanyl-phosphoryl]oxy-2-hexadecanoyloxy-propyl] (~{E})-octadec-9-enoate


Mass: 751.023 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C40H79O10P / Feature type: SUBJECT OF INVESTIGATION
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: Zinc transporter 3 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 6
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 62 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.19.2_4158: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.14 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 341267 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0035106
ELECTRON MICROSCOPYf_angle_d0.6116989
ELECTRON MICROSCOPYf_dihedral_angle_d10.521774
ELECTRON MICROSCOPYf_chiral_restr0.039861
ELECTRON MICROSCOPYf_plane_restr0.005842

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