HslUV protease complex / endopeptidase Clp / endopeptidase Clp complex / positive regulation of programmed cell death / response to temperature stimulus / ATP-dependent peptidase activity / protein quality control for misfolded or incompletely synthesized proteins / proteasomal protein catabolic process / serine-type peptidase activity / proteolysis involved in protein catabolic process ...HslUV protease complex / endopeptidase Clp / endopeptidase Clp complex / positive regulation of programmed cell death / response to temperature stimulus / ATP-dependent peptidase activity / protein quality control for misfolded or incompletely synthesized proteins / proteasomal protein catabolic process / serine-type peptidase activity / proteolysis involved in protein catabolic process / bioluminescence / generation of precursor metabolites and energy / ATP-dependent protein folding chaperone / response to radiation / positive regulation of protein catabolic process / unfolded protein binding / peptidase activity / response to heat / ATPase binding / protein dimerization activity / ribosome / serine-type endopeptidase activity / cell division / ATP hydrolysis activity / proteolysis / zinc ion binding / ATP binding / identical protein binding / membrane / cytosol 類似検索 - 分子機能
Stringent starvation protein B / SspB-like superfamily / Stringent starvation protein B / Zinc finger, ClpX C4-type superfamily / ClpX C4-type zinc finger / Clp protease, ATP-binding subunit ClpX / Zinc finger, ClpX C4-type / Clp protease, ATP-binding subunit ClpX, bacteria / ClpX zinc binding (ZB) domain profile. / ClpX C4-type zinc finger ...Stringent starvation protein B / SspB-like superfamily / Stringent starvation protein B / Zinc finger, ClpX C4-type superfamily / ClpX C4-type zinc finger / Clp protease, ATP-binding subunit ClpX / Zinc finger, ClpX C4-type / Clp protease, ATP-binding subunit ClpX, bacteria / ClpX zinc binding (ZB) domain profile. / ClpX C4-type zinc finger / : / ClpP, Ser active site / Endopeptidase Clp serine active site. / ClpP, histidine active site / Endopeptidase Clp histidine active site. / ATP-dependent Clp protease proteolytic subunit / Clp protease proteolytic subunit /Translocation-enhancing protein TepA / Clp protease / Clp ATPase, C-terminal / AAA domain (Cdc48 subfamily) / C-terminal, D2-small domain, of ClpB protein / C-terminal, D2-small domain, of ClpB protein / ClpP/crotonase-like domain superfamily / Green fluorescent protein, GFP / Green fluorescent protein-related / Green fluorescent protein / Green fluorescent protein / ATPase, AAA-type, core / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
ATP-dependent Clp protease ATP-binding subunit ClpX / ATP-dependent Clp protease proteolytic subunit / Stringent starvation protein B / Green fluorescent protein 類似検索 - 構成要素
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2023 タイトル: The SspB adaptor drives structural changes in the AAA+ ClpXP protease during ssrA-tagged substrate delivery. 著者: Alireza Ghanbarpour / Xue Fei / Tania A Baker / Joseph H Davis / Robert T Sauer / 要旨: Energy-dependent protein degradation by the AAA+ ClpXP protease helps maintain protein homeostasis in bacteria and eukaryotic organelles of bacterial origin. In and many other proteobacteria, the ...Energy-dependent protein degradation by the AAA+ ClpXP protease helps maintain protein homeostasis in bacteria and eukaryotic organelles of bacterial origin. In and many other proteobacteria, the SspB adaptor assists ClpXP in degrading ssrA-tagged polypeptides produced as a consequence of tmRNA-mediated ribosome rescue. By tethering these incomplete ssrA-tagged proteins to ClpXP, SspB facilitates their efficient degradation at low substrate concentrations. How this process occurs structurally is unknown. Here, we present a cryo-EM structure of the SspB adaptor bound to a GFP-ssrA substrate and to ClpXP. This structure provides evidence for simultaneous contacts of SspB and ClpX with the ssrA tag within the tethering complex, allowing direct substrate handoff concomitant with the initiation of substrate translocation. Furthermore, our structure reveals that binding of the substrate·adaptor complex induces unexpected conformational changes within the spiral structure of the AAA+ ClpX hexamer and its interaction with the ClpP tetradecamer.