6KLU

Troponin of cardiac thin filament in high-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 1.2 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: 10.1016/j.jsb.2020.107450
  • Primary Citation of Related Structures:  
    6KLP, 6KLQ, 6KLT, 6KLU, 6KLL, 6KLN

  • 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) ...

    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

    The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. Electronic address: twakabayashi@70.alumni.u-tokyo.ac.jp.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Troponin C, slow skeletal and cardiac musclesA157Mus musculusMutation(s): 0 
Gene Names: Tnnc1Tncc
Find proteins for P19123 (Mus musculus)
Explore P19123 
Go to UniProtKB:  P19123
NIH Common Fund Data Resources
IMPC:  MGI:98779
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Troponin T, cardiac muscleB74Mus musculusMutation(s): 0 
Gene Names: Tnnt2
Find proteins for P50752 (Mus musculus)
Explore P50752 
Go to UniProtKB:  P50752
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Troponin I, cardiac muscleC118Mus musculusMutation(s): 0 
Gene Names: Tnni3
Find proteins for P48787 (Mus musculus)
Explore P48787 
Go to UniProtKB:  P48787
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
D [auth A], E [auth A], F [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

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

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