6KLT

Troponin of cardiac thin filament in low-calcium state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12.0 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Cryo-EM structures of cardiac thin filaments reveal the 3D architecture of troponin.

Oda, T.Yanagisawa, H.Wakabayashi, T.

(2020) J Struct Biol 209: 107450-107450

  • DOI: https://doi.org/10.1016/j.jsb.2020.107450
  • Primary Citation of Related Structures:  
    6KLL, 6KLN, 6KLP, 6KLQ, 6KLT, 6KLU

  • PubMed Abstract: 

    Troponin is an essential component of striated muscle and it regulates the sliding of actomyosin system in a calcium-dependent manner. Despite its importance, the structure of troponin has been elusive due to its high structural heterogeneity. In this study, we analyzed the 3D structures of murine cardiac thin filaments using a cryo-electron microscope equipped with a Volta phase plate (VPP). Contrast enhancement by a VPP enabled us to reconstruct the entire repeat of the thin filament. We determined the orientation of troponin relative to F-actin and tropomyosin, and characterized the interactions between troponin and tropomyosin. This study provides a structural basis for understanding the molecular mechanism of actomyosin system.


  • Organizational Affiliation

    Department of Anatomy and Structural Biology, Graduate School of Medicine, University of Yamanashi, 1110 Shimokato, Chuo, Yamanashi 409-3898, Japan. Electronic address: toda@yamanashi.ac.jp.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Troponin C, slow skeletal and cardiac muscles145Mus musculusMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P19123 (Mus musculus)
Explore P19123 
Go to UniProtKB:  P19123
IMPC:  MGI:98779
Entity Groups  
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UniProt GroupP19123
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Troponin T, cardiac muscle71Mus musculusMutation(s): 0 
UniProt
Find proteins for P50752 (Mus musculus)
Explore P50752 
Go to UniProtKB:  P50752
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UniProt GroupP50752
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Troponin I, cardiac muscle115Mus musculusMutation(s): 0 
UniProt
Find proteins for P48787 (Mus musculus)
Explore P48787 
Go to UniProtKB:  P48787
Entity Groups  
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UniProt GroupP48787
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12.0 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.0.6

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-15
    Type: Initial release
  • Version 1.1: 2020-01-29
    Changes: Database references
  • Version 1.2: 2020-03-11
    Changes: Data collection, Database references
  • Version 1.3: 2024-03-27
    Changes: Data collection, Database references, Refinement description