7NEP

Homology model of the in situ actomyosin complex from the A-band of mouse psoas muscle sarcomere in the rigor state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 10.2 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

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This is version 1.1 of the entry. See complete history


Literature

The molecular basis for sarcomere organization in vertebrate skeletal muscle.

Wang, Z.Grange, M.Wagner, T.Kho, A.L.Gautel, M.Raunser, S.

(2021) Cell 184: 2135

  • DOI: 10.1016/j.cell.2021.02.047
  • Primary Citation of Related Structures:  
    7NEP

  • PubMed Abstract: 
  • Sarcomeres are force-generating and load-bearing devices of muscles. A precise molecular picture of how sarcomeres are built underpins understanding their role in health and disease. Here, we determine the molecular architecture of native vertebrate skeletal sarcomeres by electron cryo-tomography ...

    Sarcomeres are force-generating and load-bearing devices of muscles. A precise molecular picture of how sarcomeres are built underpins understanding their role in health and disease. Here, we determine the molecular architecture of native vertebrate skeletal sarcomeres by electron cryo-tomography. Our reconstruction reveals molecular details of the three-dimensional organization and interaction of actin and myosin in the A-band, I-band, and Z-disc and demonstrates that α-actinin cross-links antiparallel actin filaments by forming doublets with 6-nm spacing. Structures of myosin, tropomyosin, and actin at ~10 Å further reveal two conformations of the "double-head" myosin, where the flexible orientation of the lever arm and light chains enable myosin not only to interact with the same actin filament, but also to split between two actin filaments. Our results provide unexpected insights into the fundamental organization of vertebrate skeletal muscle and serve as a strong foundation for future investigations of muscle diseases.


    Organizational Affiliation

    Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany. Electronic address: stefan.raunser@mpi-dortmund.mpg.de.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Actin, alpha skeletal muscle
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J, K
374Mus musculusMutation(s): 0 
Gene Names: Acta1Acta
UniProt
Find proteins for P68134 (Mus musculus)
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tropomyosin alpha-1 chainL [auth P], M [auth Q], N [auth T], O [auth U]251Mus musculusMutation(s): 0 
Gene Names: Tpm1Tpm-1Tpma
UniProt & NIH Common Fund Data Resources
Find proteins for P58771 (Mus musculus)
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IMPC:  MGI:98809
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin-4P [auth L], S [auth M]813Mus musculusMutation(s): 0 
Gene Names: Myh4
UniProt
Find proteins for Q5SX39 (Mus musculus)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin light chain 1/3, skeletal muscle isoformQ [auth N], T [auth O]148Mus musculusMutation(s): 0 
Gene Names: Myl1Mylf
UniProt
Find proteins for P05977 (Mus musculus)
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin regulatory light chain 2, skeletal muscle isoformR, U [auth S]144Mus musculusMutation(s): 0 
Gene Names: Mylpf
UniProt
Find proteins for P97457 (Mus musculus)
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 10.2 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Max Planck SocietyGermany--
Wellcome TrustUnited Kingdom201543/Z/16/Z
European Research Council (ERC)European Union856118
Medical Research Council (MRC, United Kingdom)United KingdomMR/R003106/1
European Molecular Biology Organization (EMBO)European UnionALTF 693-2018

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-07
    Type: Initial release
  • Version 1.1: 2021-04-28
    Changes: Database references