7JH7 image
Deposition Date 2020-07-20
Release Date 2020-10-28
Last Version Date 2024-03-06
Entry Detail
PDB ID:
7JH7
Keywords:
Title:
cardiac actomyosin complex
Biological Source:
Source Organism:
Sus scrofa (Taxon ID: 9823)
Method Details:
Experimental Method:
Resolution:
3.80 Å
Aggregation State:
HELICAL ARRAY
Reconstruction Method:
HELICAL
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Actin, alpha cardiac muscle 1
Gene (Uniprot):ACTC1
Chain IDs:A, C (auth: B), E (auth: C), G (auth: E), H (auth: D)
Chain Length:377
Number of Molecules:5
Biological Source:Sus scrofa
Polymer Type:polypeptide(L)
Molecule:Myosin-7
Gene (Uniprot):MYH7
Chain IDs:B (auth: F), D (auth: G), F (auth: H)
Chain Length:1935
Number of Molecules:3
Biological Source:Sus scrofa
Polymer Type:polypeptide(L)
Molecule:tropomyosin
Chain IDs:I, J
Chain Length:135
Number of Molecules:2
Biological Source:Sus scrofa
Primary Citation
High-Resolution Cryo-EM Structure of the Cardiac Actomyosin Complex.
Structure 29 50 ? (2021)
PMID: 33065066 DOI: 10.1016/j.str.2020.09.013

Abstact

Heart contraction depends on a complicated array of interactions between sarcomeric proteins required to convert chemical energy into mechanical force. Cyclic interactions between actin and myosin molecules, controlled by troponin and tropomyosin, generate the sliding force between the actin-based thin and myosin-based thick filaments. Alterations in this sophisticated system due to missense mutations can lead to cardiovascular diseases. Numerous structural studies proposed pathological mechanisms of missense mutations at the myosin-myosin, actin-tropomyosin, and tropomyosin-troponin interfaces. However, despite the central role of actomyosin interactions a detailed structural description of the cardiac actomyosin interface remained unknown. Here, we report a cryo-EM structure of a cardiac actomyosin complex at 3.8 Å resolution. The structure reveals the molecular basis of cardiac diseases caused by missense mutations in myosin and actin proteins.

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Primary Citation of related structures