6em9

S.aureus ClpC resting state, asymmetric mapS.aureus ClpC resting state, asymmetric map

6em9, resolution 8.40Å Show:Asymmetric Unit Biological Assembly Structural highlights 6em9 is a 10 chain structure with sequence from Staab. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: clpC, SAB0475 (STAAB) Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CLPC_STAAB] Required for growth at high temperatures, probably by acting as a chaperone during heat shock and targeting heat-denatured proteins for degradation by ClpP. Publication Abstract from PubMed 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. Regulatory coiled-coil domains promote head-to-head assemblies of AAA+ chaperones essential for tunable activity control.,Carroni M, Franke KB, Maurer M, Jager J, Hantke I, Gloge F, Linder D, Gremer S, Turgay K, Bukau B, Mogk A Elife. 2017 Nov 22;6. doi: 10.7554/eLife.30120. PMID:29165246 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.