+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-6447 | |||||||||
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Title | Cryo-EM reconstruction of the metavinculin-actin interface | |||||||||
Map data | Reconstruction of metavinculin tail domain bound to F-actin | |||||||||
Sample |
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Keywords | actin / metavinculin / vinculin / cell migration / adhesion / mechanosensation / cytoskeleton | |||||||||
Function / homology | Function and homology information regulation of protein localization to adherens junction / podosome ring / outer dense plaque of desmosome / inner dense plaque of desmosome / cell-substrate junction / terminal web / epithelial cell-cell adhesion / zonula adherens / dystroglycan binding / alpha-catenin binding ...regulation of protein localization to adherens junction / podosome ring / outer dense plaque of desmosome / inner dense plaque of desmosome / cell-substrate junction / terminal web / epithelial cell-cell adhesion / zonula adherens / dystroglycan binding / alpha-catenin binding / fascia adherens / cell-cell contact zone / costamere / apical junction assembly / regulation of establishment of endothelial barrier / adherens junction assembly / axon extension / protein localization to cell surface / lamellipodium assembly / cytoskeletal motor activator activity / regulation of focal adhesion assembly / maintenance of blood-brain barrier / tropomyosin binding / myosin heavy chain binding / mesenchyme migration / troponin I binding / actin filament bundle / filamentous actin / actin filament bundle assembly / skeletal muscle thin filament assembly / brush border / striated muscle thin filament / skeletal muscle myofibril / actin monomer binding / Signaling by ALK fusions and activated point mutants / Smooth Muscle Contraction / skeletal muscle fiber development / stress fiber / titin binding / actin filament polymerization / cell-matrix adhesion / negative regulation of cell migration / filopodium / cell projection / actin filament / morphogenesis of an epithelium / adherens junction / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / sarcolemma / Signaling by high-kinase activity BRAF mutants / MAP2K and MAPK activation / platelet aggregation / beta-catenin binding / specific granule lumen / calcium-dependent protein binding / Signaling by RAF1 mutants / extracellular vesicle / Signaling by moderate kinase activity BRAF mutants / Paradoxical activation of RAF signaling by kinase inactive BRAF / Signaling downstream of RAS mutants / cell-cell junction / Signaling by BRAF and RAF1 fusions / Platelet degranulation / lamellipodium / cell body / actin binding / secretory granule lumen / ficolin-1-rich granule lumen / molecular adaptor activity / cytoskeleton / hydrolase activity / cell adhesion / cadherin binding / membrane raft / protein domain specific binding / focal adhesion / ubiquitin protein ligase binding / calcium ion binding / Neutrophil degranulation / positive regulation of gene expression / structural molecule activity / magnesium ion binding / protein-containing complex / extracellular exosome / extracellular region / ATP binding / identical protein binding / plasma membrane / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | Oryctolagus cuniculus (rabbit) / Homo sapiens (human) | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 8.2 Å | |||||||||
Authors | Kim LY / Thompson PM / Lee HT / Pershad M / Campbell SL / Alushin GM | |||||||||
Citation | Journal: J Mol Biol / Year: 2016 Title: The Structural Basis of Actin Organization by Vinculin and Metavinculin. Authors: Laura Y Kim / Peter M Thompson / Hyunna T Lee / Mihir Pershad / Sharon L Campbell / Gregory M Alushin / Abstract: Vinculin is an essential adhesion protein that links membrane-bound integrin and cadherin receptors through their intracellular binding partners to filamentous actin, facilitating mechanotransduction. ...Vinculin is an essential adhesion protein that links membrane-bound integrin and cadherin receptors through their intracellular binding partners to filamentous actin, facilitating mechanotransduction. Here we present an 8.5-Å-resolution cryo-electron microscopy reconstruction and pseudo-atomic model of the vinculin tail (Vt) domain bound to F-actin. Upon actin engagement, the N-terminal "strap" and helix 1 are displaced from the Vt helical bundle to mediate actin bundling. We find that an analogous conformational change also occurs in the H1' helix of the tail domain of metavinculin (MVt) upon actin binding, a muscle-specific splice isoform that suppresses actin bundling by Vt. These data support a model in which metavinculin tunes the actin bundling activity of vinculin in a tissue-specific manner, providing a mechanistic framework for understanding metavinculin mutations associated with hereditary cardiomyopathies. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_6447.map.gz | 25.6 MB | EMDB map data format | |
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Header (meta data) | emd-6447-v30.xml emd-6447.xml | 13.2 KB 13.2 KB | Display Display | EMDB header |
Images | emd_6447.png | 209.2 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-6447 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-6447 | HTTPS FTP |
-Related structure data
Related structure data | 3jbkMC 6446C 6448C 6449C 6450C 6451C 3jbiC 3jbjC M: atomic model generated by this map C: citing same article (ref.) |
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Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_6447.map.gz / Format: CCP4 / Size: 29.8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Reconstruction of metavinculin tail domain bound to F-actin | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 2.18 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Sample components
-Entire : Metavinculin tail domain bound to F-actin
Entire | Name: Metavinculin tail domain bound to F-actin |
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Components |
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-Supramolecule #1000: Metavinculin tail domain bound to F-actin
Supramolecule | Name: Metavinculin tail domain bound to F-actin / type: sample / ID: 1000 Details: Helical filament with one metavinculin tail domain bound per actin protomer Oligomeric state: One metavinculin tail domain per actin protomer Number unique components: 2 |
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-Macromolecule #1: skeletal muscle actin
Macromolecule | Name: skeletal muscle actin / type: protein_or_peptide / ID: 1 / Name.synonym: actin / Oligomeric state: helical filament / Recombinant expression: No / Database: NCBI |
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Source (natural) | Organism: Oryctolagus cuniculus (rabbit) / synonym: Rabbit / Tissue: Muscle / Location in cell: Cytoplasm, cytoskeleton |
Molecular weight | Theoretical: 41.8 KDa |
Sequence | UniProtKB: Actin, alpha skeletal muscle |
-Macromolecule #2: Metavinculin tail domain, residues 858-1129
Macromolecule | Name: Metavinculin tail domain, residues 858-1129 / type: protein_or_peptide / ID: 2 / Name.synonym: MVt / Oligomeric state: helical / Recombinant expression: Yes |
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Source (natural) | Organism: Homo sapiens (human) / synonym: Human / Organelle: Focal adhesion / Location in cell: Cytoplasmic |
Molecular weight | Theoretical: 29.6 KDa |
Recombinant expression | Organism: Escherichia coli BL21(DE3) (bacteria) / Recombinant strain: BL21(DE3) / Recombinant plasmid: 2HR-T (Addgene #29718) |
Sequence | UniProtKB: Vinculin |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | helical reconstruction |
Aggregation state | filament |
-Sample preparation
Concentration | 0.0125 mg/mL |
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Buffer | pH: 7 / Details: 50 mM KCl, 1 mM MgCl2, 1 mM EGTA, 10 mM imidazole |
Grid | Details: 200 mesh 1.2 / 1.3 C-flat |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 90 % / Instrument: LEICA EM GP Method: 3 microliters of 0.3 micromolar actin was applied to the grid and incubated for 60 seconds at 25 degrees C. 3 microliters of 10 micromolar MVt was then applied and incubated for 60 seconds. 3 ...Method: 3 microliters of 0.3 micromolar actin was applied to the grid and incubated for 60 seconds at 25 degrees C. 3 microliters of 10 micromolar MVt was then applied and incubated for 60 seconds. 3 microliters of solution was removed, then an additional 3 microliters of MVt applied. After 60 seconds, 3 microliters of solution was removed, then the grid was blotted for 2 seconds before plunging. |
-Electron microscopy
Microscope | FEI TECNAI 20 |
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Electron beam | Acceleration voltage: 120 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Calibrated magnification: 137615 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.0 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.5 µm / Nominal magnification: 100000 |
Sample stage | Specimen holder model: GATAN LIQUID NITROGEN |
Alignment procedure | Legacy - Astigmatism: Objective lens astigmatism was corrected at 100,000 times magnification. |
Date | Sep 10, 2014 |
Image recording | Category: CCD / Film or detector model: GATAN ULTRASCAN 4000 (4k x 4k) / Number real images: 671 / Average electron dose: 25 e/Å2 |
-Image processing
CTF correction | Details: FREALIGN (per segment) |
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Final reconstruction | Applied symmetry - Helical parameters - Δz: 27.80 Å Applied symmetry - Helical parameters - Δ&Phi: 166.75 ° Applied symmetry - Helical parameters - Axial symmetry: C1 (asymmetric) Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 8.2 Å / Resolution method: OTHER / Software - Name: CTFFIND3, EMAN2/SPARX, FREALIGN |
Details | Multi-model IHRSR was performed using EMAN2 / SPARX to select for bound segments, followed by single-model IHRSR with EMAN2 / SPARX and final reconstruction with FREALIGN (fixed helical parameters). |
-Atomic model buiding 1
Initial model | PDB ID: Chain - Chain ID: A |
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Software | Name: Chimera, MDFF |
Details | Components were initially rigid body fit using Chimera, followed by flexible fitting with MDFF. |
Refinement | Space: REAL / Protocol: FLEXIBLE FIT |
Output model | PDB-3jbk: |