Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 23.01 kDa 
• Atom Count: 1340 
• Modelled Residue Count: 268 
• Deposited Residue Count: 270 
• Unique protein chains: 1

6KLP

Tropomyosin of cardiac thin filament in low-calcium state

• PDB DOI: 10.2210/pdb6KLP/pdb
• EM Map EMD-0714:EMDBEMDataResource

• Classification: CONTRACTILE PROTEIN
• Organism(s): Mus musculus
• Mutation(s): No 


• Deposited: 2019-07-30 Released: 2020-01-15 
• Deposition Author(s): Oda, T., Yanagisawa, H., Wakabayashi, T.

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 6.60 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

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

• PubMed: 31954841 
• DOI: 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.

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Organizational Affiliation: 

The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tropomyosin	B [auth A], A [auth B]	135	Mus musculus	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 6.60 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2019-07-30 
• Released Date: 2020-01-15 
Deposition Author(s): Oda, T., Yanagisawa, H., Wakabayashi, T.

Revision History  

• 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: Database references