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- PDB-8qcx: Cryo-EM structure of the inward-facing FLVCR2 -

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Basic information

Entry
Database: PDB / ID: 8qcx
TitleCryo-EM structure of the inward-facing FLVCR2
ComponentsHeme transporter FLVCR2
KeywordsMEMBRANE PROTEIN / MFS / choline transport / human transporter
Function / homology
Function and homology information


heme export / ethanolamine transmembrane transporter activity / choline transmembrane transporter activity / heme transmembrane transporter activity / choline transport / transport across blood-brain barrier / mitochondrial membrane / heme binding / endoplasmic reticulum membrane / membrane / plasma membrane
Similarity search - Function
: / Major facilitator superfamily / Major Facilitator Superfamily / Major facilitator superfamily domain / Major facilitator superfamily (MFS) profile. / MFS transporter superfamily
Similarity search - Domain/homology
Choline/ethanolamine transporter FLVCR2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsWeng, T.-H. / Wu, D. / Safarian, S.
Funding support Germany, 1items
OrganizationGrant numberCountry
Max Planck Society Germany
CitationJournal: Nature / Year: 2024
Title: Molecular mechanism of choline and ethanolamine transport in humans.
Authors: Keiken Ri / Tsai-Hsuan Weng / Ainara Claveras Cabezudo / Wiebke Jösting / Yu Zhang / Andre Bazzone / Nancy C P Leong / Sonja Welsch / Raymond T Doty / Gonca Gursu / Tiffany Jia Ying Lim / ...Authors: Keiken Ri / Tsai-Hsuan Weng / Ainara Claveras Cabezudo / Wiebke Jösting / Yu Zhang / Andre Bazzone / Nancy C P Leong / Sonja Welsch / Raymond T Doty / Gonca Gursu / Tiffany Jia Ying Lim / Sarah Luise Schmidt / Janis L Abkowitz / Gerhard Hummer / Di Wu / Long N Nguyen / Schara Safarian /
Abstract: Human feline leukaemia virus subgroup C receptor-related proteins 1 and 2 (FLVCR1 and FLVCR2) are members of the major facilitator superfamily. Their dysfunction is linked to several clinical ...Human feline leukaemia virus subgroup C receptor-related proteins 1 and 2 (FLVCR1 and FLVCR2) are members of the major facilitator superfamily. Their dysfunction is linked to several clinical disorders, including PCARP, HSAN and Fowler syndrome. Earlier studies concluded that FLVCR1 may function as a haem exporter, whereas FLVCR2 was suggested to act as a haem importer, yet conclusive biochemical and detailed molecular evidence remained elusive for the function of both transporters. Here, we show that FLVCR1 and FLVCR2 facilitate the transport of choline and ethanolamine across the plasma membrane, using a concentration-driven substrate translocation process. Through structural and computational analyses, we have identified distinct conformational states of FLVCRs and unravelled the coordination chemistry underlying their substrate interactions. Fully conserved tryptophan and tyrosine residues form the binding pocket of both transporters and confer selectivity for choline and ethanolamine through cation-π interactions. Our findings clarify the mechanisms of choline and ethanolamine transport by FLVCR1 and FLVCR2, enhance our comprehension of disease-associated mutations that interfere with these vital processes and shed light on the conformational dynamics of these major facilitator superfamily proteins during the transport cycle.
History
DepositionAug 28, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Apr 17, 2024Provider: repository / Type: Initial release
Revision 1.1May 22, 2024Group: Database references / Category: citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.title / _citation.year
Revision 1.2Jun 5, 2024Group: Database references / Category: citation / citation_author / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.3Jun 19, 2024Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Heme transporter FLVCR2


Theoretical massNumber of molelcules
Total (without water)58,2771
Polymers58,2771
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area0 Å2
ΔGint0 kcal/mol
Surface area18120 Å2
MethodPISA

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Components

#1: Protein Heme transporter FLVCR2 / Calcium-chelate transporter / CCT / Feline leukemia virus subgroup C receptor-related protein 2


Mass: 58277.094 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FLVCR2, C14orf58 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: Q9UPI3

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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: FLVCR2 monomer / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.058 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: HEK293
Buffer solutionpH: 7.4
SpecimenConc.: 1.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE

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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: 2100 nm / Nominal defocus min: 1100 nm
Image recordingElectron dose: 80 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1RELION3.1particle selection
4RELION3.1CTF correction
7ISOLDEmodel fitting
8Cootmodel fitting
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
13cryoSPARC3D reconstruction
14PHENIX1.18model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 3497517
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 50167 / Algorithm: BACK PROJECTION / Symmetry type: POINT
Atomic model buildingAccession code: AF-Q9UPI3-F1 / Source name: AlphaFold / Type: in silico model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0023365
ELECTRON MICROSCOPYf_angle_d0.454582
ELECTRON MICROSCOPYf_dihedral_angle_d3.574452
ELECTRON MICROSCOPYf_chiral_restr0.035543
ELECTRON MICROSCOPYf_plane_restr0.006555

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