6KLU

Troponin of cardiac thin filament in high-calcium state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 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. --: 107450-107450

  • DOI: 10.1016/j.jsb.2020.107450
  • Primary Citation of Related Structures:  

  • 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 thi ...

    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.,Department of Cell Biology and Anatomy, Graduate School of Medicine, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. Electronic address: hyanagisaw@m.u-tokyo.ac.jp.,The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. Electronic address: twakabayashi@70.alumni.u-tokyo.ac.jp.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Troponin C, slow skeletal and cardiac muscles
A
157Mus musculusMutation(s): 0 
Gene Names: Tnnc1 (Tncc)
Find proteins for P19123 (Mus musculus)
Go to UniProtKB:  P19123
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Troponin T, cardiac muscle
B
74Mus musculusMutation(s): 0 
Gene Names: Tnnt2
Find proteins for P50752 (Mus musculus)
Go to UniProtKB:  P50752
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Troponin I, cardiac muscle
C
118Mus musculusMutation(s): 0 
Gene Names: Tnni3
Find proteins for P48787 (Mus musculus)
Go to UniProtKB:  P48787
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2020-01-15
    Type: Initial release
  • Version 1.1: 2020-01-29
    Type: Database references