8YT8 image
Deposition Date 2024-03-25
Release Date 2024-12-11
Last Version Date 2025-02-12
Entry Detail
PDB ID:
8YT8
Title:
Cryo-EM structure of the dystrophin glycoprotein complex
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Method Details:
Experimental Method:
Resolution:
3.50 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Alpha-sarcoglycan
Gene (Uniprot):Sgca
Chain IDs:A
Chain Length:291
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Beta-sarcoglycan
Gene (Uniprot):Sgcb
Chain IDs:B
Chain Length:263
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Dystrobrevin alpha
Gene (Uniprot):Dtna
Chain IDs:C
Chain Length:206
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Delta-sarcoglycan
Gene (Uniprot):Sgcd
Chain IDs:D
Chain Length:263
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Dystrophin
Gene (Uniprot):Dmd
Chain IDs:E
Chain Length:331
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Gamma-sarcoglycan
Gene (Uniprot):Sgcg
Chain IDs:F (auth: G)
Chain Length:265
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:unknown segment
Chain IDs:G (auth: I)
Chain Length:5
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Beta-dystroglycan
Gene (Uniprot):Dag1
Chain IDs:H (auth: O)
Chain Length:289
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:Sarcospan
Gene (Uniprot):Sspn
Chain IDs:I (auth: S)
Chain Length:179
Number of Molecules:1
Biological Source:Mus musculus
Primary Citation
Structure and assembly of the dystrophin glycoprotein complex.
Nature 637 1252 1260 (2025)
PMID: 39663450 DOI: 10.1038/s41586-024-08310-2

Abstact

The dystrophin glycoprotein complex (DGC) has a crucial role in maintaining cell membrane stability and integrity by connecting the intracellular cytoskeleton with the surrounding extracellular matrix1-3. Dysfunction of dystrophin and its associated proteins results in muscular dystrophy, a disorder characterized by progressive muscle weakness and degeneration4,5. Despite the important roles of the DGC in physiology and pathology, its structural details remain largely unknown, hindering a comprehensive understanding of its assembly and function. Here we isolated the native DGC from mouse skeletal muscle and obtained its high-resolution structure. Our findings unveil a markedly divergent structure from the previous model of DGC assembly. Specifically, on the extracellular side, β-, γ- and δ-sarcoglycans co-fold to form a specialized, extracellular tower-like structure, which has a central role in complex assembly by providing binding sites for α-sarcoglycan and dystroglycan. In the transmembrane region, sarcoglycans and sarcospan flank and stabilize the single transmembrane helix of dystroglycan, rather than forming a subcomplex as previously proposed6-8. On the intracellular side, sarcoglycans and dystroglycan engage in assembly with the dystrophin-dystrobrevin subcomplex through extensive interaction with the ZZ domain of dystrophin. Collectively, these findings enhance our understanding of the structural linkage across the cell membrane and provide a foundation for the molecular interpretation of many muscular dystrophy-related mutations.

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Primary Citation of related structures