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- PDB-7ktw: Cryogenic electron microscopy model of full-length human metavinc... -

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Basic information

Entry
Database: PDB / ID: 7ktw
TitleCryogenic electron microscopy model of full-length human metavinculin H1'-parallel conformation 2
Componentsmetavinculin
KeywordsCELL ADHESION / actin / adaptor protein / cadherin / cancer / catenin / cell junction / cell migration / cell signaling / focal adhesions / heart failure / inositol phospholipid / integrin / plasma membrane / skeletal muscle / smooth muscle
Function / homology
Function and homology information


regulation of protein localization to adherens junction / outer dense plaque of desmosome / inner dense plaque of desmosome / podosome ring / terminal web / cell-substrate junction / epithelial cell-cell adhesion / zonula adherens / dystroglycan binding / alpha-catenin binding ...regulation of protein localization to adherens junction / outer dense plaque of desmosome / inner dense plaque of desmosome / podosome ring / terminal web / cell-substrate junction / epithelial cell-cell adhesion / zonula adherens / dystroglycan binding / alpha-catenin binding / fascia adherens / cell-cell contact zone / apical junction assembly / costamere / adherens junction assembly / regulation of establishment of endothelial barrier / axon extension / protein localization to cell surface / lamellipodium assembly / regulation of focal adhesion assembly / maintenance of blood-brain barrier / brush border / Smooth Muscle Contraction / cell-matrix adhesion / negative regulation of cell migration / cell projection / morphogenesis of an epithelium / adherens junction / Signaling by high-kinase activity BRAF mutants / MAP2K and MAPK activation / sarcolemma / platelet aggregation / beta-catenin binding / specific granule lumen / Signaling by RAF1 mutants / Signaling by moderate kinase activity BRAF mutants / Paradoxical activation of RAF signaling by kinase inactive BRAF / Signaling downstream of RAS mutants / Signaling by BRAF and RAF1 fusions / cell-cell junction / Signaling by ALK fusions and activated point mutants / extracellular vesicle / Platelet degranulation / actin binding / secretory granule lumen / ficolin-1-rich granule lumen / molecular adaptor activity / cytoskeleton / cell adhesion / cadherin binding / membrane raft / focal adhesion / ubiquitin protein ligase binding / Neutrophil degranulation / structural molecule activity / protein-containing complex / extracellular exosome / extracellular region / plasma membrane / cytosol / cytoplasm
Similarity search - Function
Vinculin repeated domain signature. / Vinculin / Vinculin, conserved site / Vinculin family talin-binding region signature. / Vinculin/alpha-catenin / Vinculin family / Alpha-catenin/vinculin-like superfamily
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.27 Å
AuthorsIzard, T. / Rangarajan, E.S.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
CitationJournal: Int J Mol Sci / Year: 2021
Title: The Cryogenic Electron Microscopy Structure of the Cell Adhesion Regulator Metavinculin Reveals an Isoform-Specific Kinked Helix in Its Cytoskeleton Binding Domain.
Authors: Erumbi S Rangarajan / Tina Izard /
Abstract: Vinculin and its heart-specific splice variant metavinculin are key regulators of cell adhesion processes. These membrane-bound cytoskeletal proteins regulate the cell shape by binding to several ...Vinculin and its heart-specific splice variant metavinculin are key regulators of cell adhesion processes. These membrane-bound cytoskeletal proteins regulate the cell shape by binding to several other proteins at cell-cell and cell-matrix junctions. Vinculin and metavinculin link integrin adhesion molecules to the filamentous actin network. Loss of both proteins prevents cell adhesion and cell spreading and reduces the formation of stress fibers, focal adhesions, or lamellipodia extensions. The binding of talin at cell-matrix junctions or of α-catenin at cell-cell junctions activates vinculin and metavinculin by releasing their autoinhibitory head-tail interaction. Once activated, vinculin and metavinculin bind F-actin via their five-helix bundle tail domains. Unlike vinculin, metavinculin has a 68-amino-acid insertion before the second α-helix of this five-helix F-actin-binding domain. Here, we present the full-length cryogenic electron microscopy structure of metavinculin that captures the dynamics of its individual domains and unveiled a hallmark structural feature, namely a kinked isoform-specific α-helix in its F-actin-binding domain. Our identified conformational landscape of metavinculin suggests a structural priming mechanism that is consistent with the cell adhesion functions of metavinculin in response to mechanical and cellular cues. Our findings expand our understanding of metavinculin function in the heart with implications for the etiologies of cardiomyopathies.
History
DepositionNov 24, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 27, 2021Provider: repository / Type: Initial release
Revision 1.1Mar 6, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: metavinculin


Theoretical massNumber of molelcules
Total (without water)125,0621
Polymers125,0621
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area0 Å2
ΔGint0 kcal/mol
Surface area46910 Å2

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Components

#1: Protein metavinculin / vinculin / MV


Mass: 125061.500 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: VCL / Production host: Escherichia coli (E. coli) / References: UniProt: P18206

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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: metavinculin / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8 / Details: 20 mM Tris, pH 8.0, 150 mM NaCl, 0.2 mM TCEP
SpecimenConc.: 0.5 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
VitrificationInstrument: LEICA EM GP / Cryogen name: ETHANE / Humidity: 95 % / 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: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 1400 nm / Nominal defocus min: 1400 nm / Cs: 2.7 mm / Alignment procedure: ZEMLIN TABLEAU
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 1.6 sec. / Electron dose: 67.92 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2998
EM imaging opticsEnergyfilter slit width: 20 eV

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Processing

SoftwareName: PHENIX / Version: 1.13_2998: / Classification: refinement
EM software
IDNameVersionCategory
2Leginonimage acquisition
4CTFFINDCTF correction
10cryoSPARC2.15initial Euler assignment
11cryoSPARC2.15final Euler assignment
12cryoSPARC2.15classification
13cryoSPARC2.153D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 4.27 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 366802 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0077654
ELECTRON MICROSCOPYf_angle_d1.03210325
ELECTRON MICROSCOPYf_dihedral_angle_d9.3764844
ELECTRON MICROSCOPYf_chiral_restr0.0541215
ELECTRON MICROSCOPYf_plane_restr0.0071358

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