4A7H

Structure of the Actin-Tropomyosin-Myosin Complex (rigor ATM 2)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.80 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, 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 ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ACTIN, ALPHA SKELETAL MUSCLE ADEFG375Oryctolagus cuniculusMutation(s): 0 
Gene Names: ACTA1ACTA
Find proteins for P68135 (Oryctolagus cuniculus)
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Go to UniProtKB:  P68135
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
TROPOMYOSIN 1-ALPHA CHAIN BH136Oryctolagus cuniculusMutation(s): 0 
Gene Names: TPM1TPMA
Find proteins for P58772 (Oryctolagus cuniculus)
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Go to UniProtKB:  P58772
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
MYOSIN IE HEAVY CHAIN CIJ697Dictyostelium discoideumMutation(s): 1 
Gene Names: myoEdmiEDDB_G0288679
EC: 3.6.4.1
Find proteins for Q03479 (Dictyostelium discoideum)
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Go to UniProtKB:  Q03479
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.80 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

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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