6KLQ image
Entry Detail
PDB ID:
6KLQ
EMDB ID:
EMD-0715
Keywords:
CONTRACTILE PROTEIN
Title:
Tropomyosin of cardiac thin filament in high-calcium state
Biological Source:
Source Organism:
Mus musculus
PDB Version:
Deposition Date:
2019-07-30
Release Date:
2020-01-15
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
7.70 Å
Aggregation State:
FILAMENT
Reconstruction Method:
SINGLE PARTICLE
6KLQ validation report
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Tropomyosin
Chain IDs:A, B
Chain Length:135
Number of Molecules:2
Biological Source:Mus musculus
Ligand Molecules
NA
Primary Citation
Cryo-EM structures of cardiac thin filaments reveal the 3D architecture of troponin.
J.Struct.Biol. 209 107450 107450 (2020)
PMID: 31954841 DOI: 10.1016/j.jsb.2020.107450

Abstact

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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Primary Citation of related structures
6KLQ