6EM9 image
Entry Detail
PDB ID:
6EM9
EMDB ID:
Keywords:
Title:
S.aureus ClpC resting state, asymmetric map
Biological Source:
PDB Version:
Deposition Date:
2017-10-01
Release Date:
2017-12-27
Method Details:
Experimental Method:
Resolution:
8.40 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:ATP-dependent Clp protease ATP-binding subunit ClpC
Chain IDs:A, B, C, D, E, F, G, H (auth: I), I (auth: H), J (auth: L)
Chain Length:818
Number of Molecules:10
Biological Source:Staphylococcus aureus (strain bovine RF122 / ET3-1)
Ligand Molecules
Primary Citation
Regulatory coiled-coil domains promote head-to-head assemblies of AAA+ chaperones essential for tunable activity control.
Elife 6 ? ? (2017)
PMID: 29165246 DOI: 10.7554/eLife.30120

Abstact

Ring-forming AAA+ chaperones exert ATP-fueled substrate unfolding by threading through a central pore. This activity is potentially harmful requiring mechanisms for tight repression and substrate-specific activation. The AAA+ chaperone ClpC with the peptidase ClpP forms a bacterial protease essential to virulence and stress resistance. The adaptor MecA activates ClpC by targeting substrates and stimulating ClpC ATPase activity. We show how ClpC is repressed in its ground state by determining ClpC cryo-EM structures with and without MecA. ClpC forms large two-helical assemblies that associate via head-to-head contacts between coiled-coil middle domains (MDs). MecA converts this resting state to an active planar ring structure by binding to MD interaction sites. Loss of ClpC repression in MD mutants causes constitutive activation and severe cellular toxicity. These findings unravel an unexpected regulatory concept executed by coiled-coil MDs to tightly control AAA+ chaperone activity.

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Primary Citation of related structures