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- PDB-8qbf: Compact state - Pil1 dimer with lipid headgroups fitted in native... -

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Basic information

Entry
Database: PDB / ID: 8qbf
TitleCompact state - Pil1 dimer with lipid headgroups fitted in native eisosome lattice bound to plasma membrane microdomain
ComponentsSphingolipid long chain base-responsive protein PIL1
KeywordsLIPID BINDING PROTEIN / BAR domain / lipid reconstitution / membrane microdomain
Function / homology
Function and homology information


protein localization to eisosome filament / eisosome filament / eisosome assembly / eisosome / lipid droplet / cell periphery / endocytosis / protein localization / mitochondrial outer membrane / lipid binding ...protein localization to eisosome filament / eisosome filament / eisosome assembly / eisosome / lipid droplet / cell periphery / endocytosis / protein localization / mitochondrial outer membrane / lipid binding / mitochondrion / plasma membrane / cytoplasm
Similarity search - Function
Eisosome component PIL1/LSP1 / Eisosome component PIL1 / AH/BAR domain superfamily
Similarity search - Domain/homology
D-MYO-INOSITOL-1,4,5-TRIPHOSPHATE / PHOSPHOSERINE / Sphingolipid long chain base-responsive protein PIL1
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.67 Å
AuthorsKefauver, J.M. / Zou, L. / Desfosses, A. / Loewith, R.J.
Funding supportEuropean Union, Switzerland, 4items
OrganizationGrant numberCountry
H2020 Marie Curie Actions of the European Commission101026765European Union
European Research Council (ERC)AdG TENDOEuropean Union
Swiss National Science FoundationCRSII5_189996 Switzerland
Swiss National Science Foundation310030_207754 Switzerland
Citation
Journal: Nature / Year: 2024
Title: Cryo-EM architecture of a near-native stretch-sensitive membrane microdomain.
Authors: Jennifer M Kefauver / Markku Hakala / Luoming Zou / Josephine Alba / Javier Espadas / Maria G Tettamanti / Jelena Gajić / Caroline Gabus / Pablo Campomanes / Leandro F Estrozi / Nesli E Sen ...Authors: Jennifer M Kefauver / Markku Hakala / Luoming Zou / Josephine Alba / Javier Espadas / Maria G Tettamanti / Jelena Gajić / Caroline Gabus / Pablo Campomanes / Leandro F Estrozi / Nesli E Sen / Stefano Vanni / Aurélien Roux / Ambroise Desfosses / Robbie Loewith /
Abstract: Biological membranes are partitioned into functional zones termed membrane microdomains, which contain specific lipids and proteins. The composition and organization of membrane microdomains remain ...Biological membranes are partitioned into functional zones termed membrane microdomains, which contain specific lipids and proteins. The composition and organization of membrane microdomains remain controversial because few techniques are available that allow the visualization of lipids in situ without disrupting their native behaviour. The yeast eisosome, composed of the BAR-domain proteins Pil1 and Lsp1 (hereafter, Pil1/Lsp1), scaffolds a membrane compartment that senses and responds to mechanical stress by flattening and releasing sequestered factors. Here we isolated near-native eisosomes as helical tubules made up of a lattice of Pil1/Lsp1 bound to plasma membrane lipids, and solved their structures by helical reconstruction. Our structures reveal a striking organization of membrane lipids, and, using in vitro reconstitutions and molecular dynamics simulations, we confirmed the positioning of individual PI(4,5)P, phosphatidylserine and sterol molecules sequestered beneath the Pil1/Lsp1 coat. Three-dimensional variability analysis of the native-source eisosomes revealed a dynamic stretching of the Pil1/Lsp1 lattice that affects the sequestration of these lipids. Collectively, our results support a mechanism in which stretching of the Pil1/Lsp1 lattice liberates lipids that would otherwise be anchored by the Pil1/Lsp1 coat, and thus provide mechanistic insight into how eisosome BAR-domain proteins create a mechanosensitive membrane microdomain.
#1: Journal: Acta Crystallogr D Struct Biol / Year: 2018
Title: Real-space refinement in PHENIX for cryo-EM and crystallography.
Authors: Pavel V Afonine / Billy K Poon / Randy J Read / Oleg V Sobolev / Thomas C Terwilliger / Alexandre Urzhumtsev / Paul D Adams /
Abstract: This article describes the implementation of real-space refinement in the phenix.real_space_refine program from the PHENIX suite. The use of a simplified refinement target function enables very fast ...This article describes the implementation of real-space refinement in the phenix.real_space_refine program from the PHENIX suite. The use of a simplified refinement target function enables very fast calculation, which in turn makes it possible to identify optimal data-restraint weights as part of routine refinements with little runtime cost. Refinement of atomic models against low-resolution data benefits from the inclusion of as much additional information as is available. In addition to standard restraints on covalent geometry, phenix.real_space_refine makes use of extra information such as secondary-structure and rotamer-specific restraints, as well as restraints or constraints on internal molecular symmetry. The re-refinement of 385 cryo-EM-derived models available in the Protein Data Bank at resolutions of 6 Å or better shows significant improvement of the models and of the fit of these models to the target maps.
History
DepositionAug 24, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jul 24, 2024Provider: repository / Type: Initial release
Revision 1.1Jul 31, 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.title / _citation.year
Revision 1.2Aug 7, 2024Group: Database references / Category: citation / citation_author / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.3Aug 28, 2024Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Sphingolipid long chain base-responsive protein PIL1
B: Sphingolipid long chain base-responsive protein PIL1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)62,2036
Polymers60,9932
Non-polymers1,2104
Water00
1


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

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Components

#1: Protein Sphingolipid long chain base-responsive protein PIL1


Mass: 30496.256 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / Strain: TB50 / References: UniProt: P53252
#2: Chemical ChemComp-I3P / D-MYO-INOSITOL-1,4,5-TRIPHOSPHATE


Mass: 420.096 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C6H15O15P3 / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-SEP / PHOSPHOSERINE / PHOSPHONOSERINE


Type: L-peptide linking / Mass: 185.072 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C3H8NO6P / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: HELICAL ARRAY / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Helical lattice of native Pil1/Lsp1 protein bound to plasma membrane microdomain
Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast) / Strain: TB50
Buffer solutionpH: 7 / Details: 50mM PIPES pH 7, 300mM NaCl, 1mM CHAPS, 0.5mM DTT
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: EMS Lacey Carbon
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: 1800 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K2 QUANTUM (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1RELION3.0.8particle selection
4Gctf1.06CTF correction
7UCSF Chimera1.16model fitting
8Coot0.8.9.2model fitting
10RELION3.0.8initial Euler assignment
11cryoSPARC4.1.2final Euler assignment
13cryoSPARC4.1.23D reconstruction
14PHENIX1.20-4459model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.67 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 63118 / Symmetry type: POINT
Atomic model buildingAccession code: P53252 / Source name: AlphaFold / Type: in silico model

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