7YWY image
Entry Detail
PDB ID:
7YWY
EMDB ID:
Keywords:
Title:
Structure of the GroEL chaperonin in complex with the CnoX chaperedoxin
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-02-15
Release Date:
2023-02-22
Method Details:
Experimental Method:
Resolution:
3.40 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Chaperedoxin
Chain IDs:A (auth: a), C (auth: A), E (auth: B), G (auth: C), I (auth: D), K (auth: E), M (auth: F), O (auth: Y), Q (auth: M), S (auth: N), U (auth: O), W (auth: P), Y (auth: Q), AA (auth: R)
Chain Length:88
Number of Molecules:14
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Description:Chaperonin GroEL
Chain IDs:B (auth: b), D (auth: G), F (auth: H), H (auth: I), J, L (auth: K), N (auth: L), P (auth: Z), R (auth: S), T, V (auth: U), X (auth: V), Z (auth: W), BA (auth: X)
Chain Length:88
Number of Molecules:14
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
A molecular device for the redox quality control of GroEL/ES substrates.
Cell 186 1039 1049.e17 (2023)
PMID: 36764293 DOI: 10.1016/j.cell.2023.01.013

Abstact

Hsp60 chaperonins and their Hsp10 cofactors assist protein folding in all living cells, constituting the paradigmatic example of molecular chaperones. Despite extensive investigations of their structure and mechanism, crucial questions regarding how these chaperonins promote folding remain unsolved. Here, we report that the bacterial Hsp60 chaperonin GroEL forms a stable, functionally relevant complex with the chaperedoxin CnoX, a protein combining a chaperone and a redox function. Binding of GroES (Hsp10 cofactor) to GroEL induces CnoX release. Cryoelectron microscopy provided crucial structural information on the GroEL-CnoX complex, showing that CnoX binds GroEL outside the substrate-binding site via a highly conserved C-terminal α-helix. Furthermore, we identified complexes in which CnoX, bound to GroEL, forms mixed disulfides with GroEL substrates, indicating that CnoX likely functions as a redox quality-control plugin for GroEL. Proteins sharing structural features with CnoX exist in eukaryotes, suggesting that Hsp60 molecular plugins have been conserved through evolution.

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Primary Citation of related structures