2C7D image
Entry Detail
PDB ID:
2C7D
Keywords:
Title:
Fitted coordinates for GroEL-ADP7-GroES Cryo-EM complex (EMD-1181)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2005-11-22
Release Date:
2006-01-25
Method Details:
Experimental Method:
Resolution:
8.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:60 KDA CHAPERONIN
Chain IDs:A, B, C, D, E, F, G, H, I, J, K, L, M, N
Chain Length:547
Number of Molecules:14
Biological Source:ESCHERICHIA COLI
Polymer Type:polypeptide(L)
Description:10 KDA CHAPERONIN MOLECULE: GROES, PROTEIN CPN10, GROES PROTEIN
Chain IDs:O, P, Q, R, S, T, U
Chain Length:97
Number of Molecules:7
Biological Source:ESCHERICHIA COLI
Ligand Molecules
Primary Citation
Allosteric Signalling of ATP Hydrolysis in Groel-Groes Complexes.
Nat.Struct.Mol.Biol. 13 147 ? (2006)
PMID: 16429154 DOI: 10.1038/NSMB1046

Abstact

The double-ring chaperonin GroEL and its lid-like cochaperonin GroES form asymmetric complexes that, in the ATP-bound state, mediate productive folding in a hydrophilic, GroES-encapsulated chamber, the so-called cis cavity. Upon ATP hydrolysis within the cis ring, the asymmetric complex becomes able to accept non-native polypeptides and ATP in the open, trans ring. Here we have examined the structural basis for this allosteric switch in activity by cryo-EM and single-particle image processing. ATP hydrolysis does not change the conformation of the cis ring, but its effects are transmitted through an inter-ring contact and cause domain rotations in the mobile trans ring. These rigid-body movements in the trans ring lead to disruption of its intra-ring contacts, expansion of the entire ring and opening of both the nucleotide pocket and the substrate-binding domains, admitting ATP and new substrate protein.

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