4A7N

Structure of bare F-actin filaments obtained from the same sample as the Actin-Tropomyosin-Myosin Complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.90 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of the Rigor Actin-Tropomyosin-Myosin Complex.

Behrmann, E.Muller, M.Penczek, P.A.Mannherz, H.G.Manstein, D.J.Raunser, S.

(2012) Cell 150: 327

  • DOI: https://doi.org/10.1016/j.cell.2012.05.037
  • Primary Citation of Related Structures:  
    4A7F, 4A7H, 4A7L, 4A7N

  • PubMed Abstract: 

    Regulation of myosin and filamentous actin interaction by tropomyosin is a central feature of contractile events in muscle and nonmuscle cells. However, little is known about molecular interactions within the complex and the trajectory of tropomyosin movement between its "open" and "closed" positions on the actin filament. Here, we report the 8 Å resolution structure of the rigor (nucleotide-free) actin-tropomyosin-myosin complex determined by cryo-electron microscopy. The pseudoatomic model of the complex, obtained from fitting crystal structures into the map, defines the large interface involving two adjacent actin monomers and one tropomyosin pseudorepeat per myosin contact. Severe forms of hereditary myopathies are linked to mutations that critically perturb this interface. Myosin binding results in a 23 Å shift of tropomyosin along actin. Complex domain motions occur in myosin, but not in actin. Based on our results, we propose a structural model for the tropomyosin-dependent modulation of myosin binding to actin.


  • Organizational Affiliation

    Department of Physical Biochemistry, Max Planck Institute of Molecular Physiology, 44227 Dortmund, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
F-ACTIN
A, B, C, D, E
375Oryctolagus cuniculusMutation(s): 0 
UniProt
Find proteins for P68135 (Oryctolagus cuniculus)
Explore P68135 
Go to UniProtKB:  P68135
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP68135
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download Ideal Coordinates CCD File 
F [auth A],
H [auth B],
J [auth C],
L [auth D],
N [auth E]
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
G [auth A],
I [auth B],
K [auth C],
M [auth D],
O [auth E]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
HIC
Query on HIC
A, B, C, D, E
L-PEPTIDE LINKINGC7 H11 N3 O2HIS
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.90 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONSPARX

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-01
    Type: Initial release
  • Version 1.1: 2017-04-19
    Changes: Other
  • Version 1.2: 2017-08-30
    Changes: Data collection