4A7L

Structure of the Actin-Tropomyosin-Myosin Complex (rigor ATM 1)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.1 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

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: 10.1016/j.cell.2012.05.037
  • Primary Citation of Related Structures:  4A7F, 4A7H, 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACTIN, ALPHA SKELETON MUSCLE
A, D, E, F, I
375Oryctolagus cuniculusGene Names: ACTA1 (ACTA)
Find proteins for P68135 (Oryctolagus cuniculus)
Go to Gene View: ACTA1
Go to UniProtKB:  P68135
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
TROPOMYOSIN 1 ALPHA
B, H
136Oryctolagus cuniculusGene Names: TPM1 (TPMA)
Find proteins for P58772 (Oryctolagus cuniculus)
Go to Gene View: TPM1
Go to UniProtKB:  P58772
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
MYOSIN IE HEAVY CHAIN
C, G, J
697Dictyostelium discoideumGene Names: myoE (dmiE)
Find proteins for Q03479 (Dictyostelium discoideum)
Go to UniProtKB:  Q03479
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
A, D, E, F, I
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A, D, E, F, I
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
HIC
Query on HIC
A, D, E, F, I
L-PEPTIDE LINKINGC7 H11 N3 O2HIS
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 8.1 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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