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- PDB-3jbj: Cryo-EM reconstruction of F-actin -

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Basic information

Entry
Database: PDB / ID: 3jbj
TitleCryo-EM reconstruction of F-actin
ComponentsActin, alpha skeletal muscle
KeywordsSTRUCTURAL PROTEIN / actin / cell migration / adhesion / mechanosensation / cytoskeleton
Function / homology
Function and homology information


cytoskeletal motor activator activity / myosin heavy chain binding / tropomyosin binding / actin filament bundle / troponin I binding / filamentous actin / mesenchyme migration / actin filament bundle assembly / skeletal muscle myofibril / striated muscle thin filament ...cytoskeletal motor activator activity / myosin heavy chain binding / tropomyosin binding / actin filament bundle / troponin I binding / filamentous actin / mesenchyme migration / actin filament bundle assembly / skeletal muscle myofibril / striated muscle thin filament / skeletal muscle thin filament assembly / actin monomer binding / skeletal muscle fiber development / stress fiber / titin binding / actin filament polymerization / filopodium / actin filament / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / calcium-dependent protein binding / lamellipodium / cell body / hydrolase activity / protein domain specific binding / calcium ion binding / positive regulation of gene expression / magnesium ion binding / ATP binding / identical protein binding / cytoplasm
Similarity search - Function
Actins signature 1. / Actin, conserved site / Actins signature 2. / Actin/actin-like conserved site / Actins and actin-related proteins signature. / Actin / Actin family / Actin / ATPase, nucleotide binding domain
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / Actin, alpha skeletal muscle
Similarity search - Component
Biological speciesOryctolagus cuniculus (rabbit)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 7.6 Å
AuthorsKim, L.Y. / Thompson, P.M. / Lee, H.T. / Pershad, M. / Campbell, S.L. / Alushin, G.M.
CitationJournal: 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
DepositionSep 3, 2015Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 4, 2015Provider: repository / Type: Initial release
Revision 1.1Feb 17, 2016Group: Database references
Revision 1.2Jul 18, 2018Group: Author supporting evidence / Data collection / Category: em_single_particle_entity / em_software / Item: _em_software.image_processing_id / _em_software.name
Revision 1.3Feb 21, 2024Group: Data collection / Database references ...Data collection / Database references / Derived calculations / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_3d_fitting_list / pdbx_initial_refinement_model / pdbx_struct_conn_angle / struct_conn / struct_site
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type / _pdbx_struct_conn_angle.ptnr1_auth_comp_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_asym_id / _pdbx_struct_conn_angle.ptnr1_label_atom_id / _pdbx_struct_conn_angle.ptnr1_label_comp_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr3_auth_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_asym_id / _pdbx_struct_conn_angle.ptnr3_label_atom_id / _pdbx_struct_conn_angle.ptnr3_label_comp_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _pdbx_struct_conn_angle.value / _struct_conn.pdbx_dist_value / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_site.pdbx_auth_asym_id / _struct_site.pdbx_auth_comp_id / _struct_site.pdbx_auth_seq_id

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Structure visualization

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  • EMDB-6448
  • Imaged by UCSF Chimera
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Structure viewerMolecule:
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Assembly

Deposited unit
A: Actin, alpha skeletal muscle
B: Actin, alpha skeletal muscle
hetero molecules


Theoretical massNumber of molelcules
Total (without water)84,6286
Polymers83,7252
Non-polymers9034
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
SymmetryHelical symmetry: (Circular symmetry: 1 / Dyad axis: no / N subunits divisor: 1 / Num. of operations: 1 / Rise per n subunits: 27.8 Å / Rotation per n subunits: -166.67 °)

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Components

#1: Protein Actin, alpha skeletal muscle / Alpha-actin-1


Mass: 41862.613 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Oryctolagus cuniculus (rabbit) / Tissue: skeletal muscle / References: UniProt: P68135
#2: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg
#3: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Comment: ADP, energy-carrying molecule*YM

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Experimental details

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Experiment

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

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Sample preparation

Component
IDNameTypeDetailsParent-ID
1F-actinCOMPLEXHelical0
2skeletal muscle actin1
Buffer solutionName: 50 mM KCl, 1 mM MgCl2, 1 mM EGTA, 10 mM imidazole / pH: 7 / Details: 50 mM KCl, 1 mM MgCl2, 1 mM EGTA, 10 mM imidazole
SpecimenConc.: 0.0125 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: 200 mesh 1.2 / 1.3 C-flat
VitrificationInstrument: LEICA EM GP / Cryogen name: ETHANE / Humidity: 90 %
Details: 3 microliters of 0.3 micromolar actin was applied to the grid and incubated for 60 seconds at 25 degrees C. The grid was blotted for 2 seconds before plunging into liquid ethane (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. The grid was blotted for 2 seconds before plunging.

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Electron microscopy imaging

MicroscopyModel: FEI TECNAI 20 / Date: May 13, 2014
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 120 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 100000 X / Calibrated magnification: 137615 X / Nominal defocus max: 3000 nm / Nominal defocus min: 1500 nm / Cs: 2 mm
Astigmatism: Objective lens astigmatism was corrected at 100,000 times magnification.
Specimen holderSpecimen holder model: GATAN LIQUID NITROGEN
Image recordingElectron dose: 25 e/Å2 / Film or detector model: GATAN ULTRASCAN 4000 (4k x 4k)
Image scansNum. digital images: 1257

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Processing

EM software
IDNameVersionCategory
1CTFFIND3CTF correction
2MDFFmodel fitting
3UCSF Chimeramodel fitting
4EMAN23D reconstruction
5FREALIGN3D reconstruction
6SPARX3D reconstruction
CTF correctionDetails: FREALIGN (per segment)
Helical symmertyAngular rotation/subunit: 166.67 ° / Axial rise/subunit: 27.8 Å / Axial symmetry: C1
3D reconstructionMethod: IHRSR / Resolution: 7.6 Å / Resolution method: FSC 0.143 CUT-OFF / Nominal pixel size: 2.18 Å / Actual pixel size: 2.18 Å / Magnification calibration: catalase crystal
Details: (Helical Details: Single model IHRSR was performed with EMAN2 / SPARX and final reconstruction with FREALIGN (fixed helical parameters).)
Symmetry type: HELICAL
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Details: REFINEMENT PROTOCOL--flexible DETAILS--Components were initially rigid body fit using Chimera, followed by flexible fitting with MDFF.
Atomic model buildingPDB-ID: 3J8A

3j8a


Pdb chain-ID: A / Accession code: 3J8A / Source name: PDB / Type: experimental model
Refinement stepCycle: LAST
ProteinNucleic acidLigandSolventTotal
Num. atoms5722 0 56 0 5778

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