Abstract
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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Acknowledgements
We thank R. Westlake and S. Killen for computer support and E. Orlova, W. Fenton and A. Horovitz for discussion. This work was supported by a Wellcome Trust Programme Grant to H.R.S., a Leeds University Research Fellowship to N.A.R. and Howard Hughes Medical Institute support to A.L.H.
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Supplementary information
Supplementary Figure 1
Resolution tests for GroEL-GroES complexes (PDF 321 kb)
Supplementary Figure 2
Effect of crystal packing on the GroEL-ADP7-GroES structure (PDF 1696 kb)
Supplementary Figure 3
The relay helix (PDF 961 kb)
Supplementary Video 1
Side view movie alternating between ATP bound and ADP bound state (GIF 136 kb)
Supplementary Video 2
End view movie alternating between ATP and ADP bound state (GIF 112 kb)
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Ranson, N., Clare, D., Farr, G. et al. Allosteric signaling of ATP hydrolysis in GroEL–GroES complexes. Nat Struct Mol Biol 13, 147–152 (2006). https://doi.org/10.1038/nsmb1046
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DOI: https://doi.org/10.1038/nsmb1046
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