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- PDB-8qi6: 420A Vipp1 H1-6 helical tubes -

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Basic information

Entry
Database: PDB / ID: 8qi6
Title420A Vipp1 H1-6 helical tubes
ComponentsMembrane-associated protein Vipp1
KeywordsLIPID BINDING PROTEIN / membrane remodeling / membrane tubulation
Function / homologyPspA/IM30 / PspA/IM30 family / plasma membrane / Membrane-associated protein Vipp1
Function and homology information
Biological speciesSynechocystis sp. PCC 6803 (bacteria)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 7.8 Å
AuthorsJunglas, B. / Sachse, C.
Funding support Germany, 2items
OrganizationGrant numberCountry
German Research Foundation (DFG)SA 1882/6-1 Germany
German Research Foundation (DFG)SCHN 690/16-1 Germany
Citation
Journal: Nat Struct Mol Biol / Year: 2024
Title: Structural basis for Vipp1 membrane binding: from loose coats and carpets to ring and rod assemblies.
Authors: Benedikt Junglas / David Kartte / Mirka Kutzner / Nadja Hellmann / Ilona Ritter / Dirk Schneider / Carsten Sachse /
Abstract: Vesicle-inducing protein in plastids 1 (Vipp1) is critical for thylakoid membrane biogenesis and maintenance. Although Vipp1 has recently been identified as a member of the endosomal sorting ...Vesicle-inducing protein in plastids 1 (Vipp1) is critical for thylakoid membrane biogenesis and maintenance. Although Vipp1 has recently been identified as a member of the endosomal sorting complexes required for transport III superfamily, it is still unknown how Vipp1 remodels membranes. Here, we present cryo-electron microscopy structures of Synechocystis Vipp1 interacting with membranes: seven structures of helical and stacked-ring assemblies at 5-7-Å resolution engulfing membranes and three carpet structures covering lipid vesicles at ~20-Å resolution using subtomogram averaging. By analyzing ten structures of N-terminally truncated Vipp1, we show that helix α0 is essential for membrane tubulation and forms the membrane-anchoring domain of Vipp1. Lastly, using a conformation-restrained Vipp1 mutant, we reduced the structural plasticity of Vipp1 and determined two structures of Vipp1 at 3.0-Å resolution, resolving the molecular details of membrane-anchoring and intersubunit contacts of helix α0. Our data reveal membrane curvature-dependent structural transitions from carpets to rings and rods, some of which are capable of inducing and/or stabilizing high local membrane curvature triggering membrane fusion.
#1: Journal: Biorxiv / Year: 2024
Title: Structural basis for Vipp1 membrane binding: From loose coats and carpets to ring and rod assemblies
Authors: Junglas, B. / Kartte, D. / Kutzner, M. / Hellmann, N. / Ritter, I. / Schneider, D. / Sachse, C.
History
DepositionSep 11, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Sep 18, 2024Provider: repository / Type: Initial release
Revision 1.1Oct 16, 2024Group: Data collection / Database references / Structure summary
Category: citation / citation_author ...citation / citation_author / em_admin / pdbx_entry_details
Item: _em_admin.last_update
Revision 1.2Oct 23, 2024Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.pdbx_database_id_PubMed / _citation.title / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
D: Membrane-associated protein Vipp1


Theoretical massNumber of molelcules
Total (without water)21,0611
Polymers21,0611
Non-polymers00
Water00
1
D: Membrane-associated protein Vipp1
x 60


Theoretical massNumber of molelcules
Total (without water)1,263,63460
Polymers1,263,63460
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation59
MethodUCSF CHIMERA

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Components

#1: Protein Membrane-associated protein Vipp1 / Vesicle-inducing protein in plastids 1 / Vipp1


Mass: 21060.562 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Synechocystis sp. PCC 6803 (bacteria) / Gene: vipp1, sll0617 / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): C41 / References: UniProt: Q55707
Has protein modificationN

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: Vipp1 H1-6 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Synechocystis sp. PCC 6803 (bacteria)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria) / Strain: C41
Buffer solutionpH: 8
SpecimenEmbedding applied: YES / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
EM embeddingMaterial: vitreous ice
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: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 48 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: 82 ° / Axial rise/subunit: 2.73 Å / Axial symmetry: C2
3D reconstructionResolution: 7.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 49285 / Symmetry type: HELICAL

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