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- PDB-8r35: CryoEM structure of the asymmetric Pho90 dimer from yeast without... -

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Basic information

Entry
Database: PDB / ID: 8r35
TitleCryoEM structure of the asymmetric Pho90 dimer from yeast without substrates.
ComponentsLow-affinity phosphate transporter PHO90
KeywordsMEMBRANE PROTEIN / Phosphate transporter / Plasma membrane protein
Function / homology
Function and homology information


regulation of phosphate transmembrane transport / phosphate transmembrane transporter activity / phosphate ion transport / polyphosphate metabolic process / cell periphery / transmembrane transport / plasma membrane
Similarity search - Function
SPX domain / Citrate transporter-like domain / Citrate transporter / SPX domain / SPX domain profile.
Similarity search - Domain/homology
Low-affinity phosphate transporter PHO90
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.12 Å
AuthorsSchneider, S. / Kuehlbrandt, W. / Yildiz, O.
Funding support Germany, 1items
OrganizationGrant numberCountry
Max Planck Society Germany
CitationJournal: Structure / Year: 2024
Title: Complementary structures of the yeast phosphate transporter Pho90 provide insights into its transport mechanism.
Authors: Simon Schneider / Werner Kühlbrandt / Özkan Yildiz /
Abstract: Phosphate homeostasis is essential for all living organisms. Low-affinity phosphate transporters are involved in phosphate import and regulation in a range of eukaryotic organisms. We have determined ...Phosphate homeostasis is essential for all living organisms. Low-affinity phosphate transporters are involved in phosphate import and regulation in a range of eukaryotic organisms. We have determined the structures of the Saccharomyces cerevisiae phosphate importer Pho90 by electron cryomicroscopy in two complementary states at 2.3 and 3.1 Å resolution. The symmetrical, outward-open structure in the presence of phosphate indicates bound substrate ions in the binding pocket. In the absence of phosphate, Pho90 assumes an asymmetric structure with one monomer facing inward and one monomer facing outward, providing insights into the transport mechanism. The Pho90 transport domain binds phosphate ions on one side of the membrane, then flips to the other side where the substrate is released. Together with functional experiments, these complementary structures illustrate the transport mechanism of eukaryotic low-affinity phosphate transporters.
History
DepositionNov 8, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Apr 24, 2024Provider: repository / Type: Initial release
Revision 1.1May 15, 2024Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Low-affinity phosphate transporter PHO90
B: Low-affinity phosphate transporter PHO90


Theoretical massNumber of molelcules
Total (without water)195,5722
Polymers195,5722
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable, native gel electrophoresis
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Low-affinity phosphate transporter PHO90


Mass: 97786.219 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: PHO90, YJL198W, J0336 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P39535

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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: Dimeric ScPho90 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Source (recombinant)Organism: Saccharomyces cerevisiae (brewer's yeast)
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
1100 mMSodium chlorideNaCl1
220 mMTris1
SpecimenConc.: 4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 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: 2300 nm / Nominal defocus min: 600 nm / Cs: 2.7 mm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 65 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameCategory
2EPUimage acquisition
4cryoSPARCCTF correction
7UCSF ChimeraXmodel fitting
9cryoSPARCinitial Euler assignment
10cryoSPARCfinal Euler assignment
11cryoSPARCclassification
12cryoSPARC3D reconstruction
13Cootmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.12 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 33833 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0037302
ELECTRON MICROSCOPYf_angle_d0.529926
ELECTRON MICROSCOPYf_dihedral_angle_d3.328982
ELECTRON MICROSCOPYf_chiral_restr0.0371233
ELECTRON MICROSCOPYf_plane_restr0.0051185

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