4I5O

Crystal Structure of W-W-R ClpX Hexamer

4I5O の概要

• エントリーDOI: 10.2210/pdb4i5o/pdb
• 関連するPDBエントリー: 3HTE 3HWS 4I34 4I4L 4I63
• 分子名称: ATP-dependent Clp protease ATP-binding subunit ClpX, SULFATE ION (2 entities in total)
• 機能のキーワード: atpase, hexameric, motor protein
• 由来する生物種: Escherichia coli
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 237191.14

構造登録者

Glynn, S.E.,Nager, A.R.,Stinson, B.S.,Schmitz, K.R.,Baker, T.A.,Sauer, R.T. (登録日: 2012-11-28, 公開日: 2013-05-15, 最終更新日: 2023-09-20)

主引用文献

Stinson, B.M.,Nager, A.R.,Glynn, S.E.,Schmitz, K.R.,Baker, T.A.,Sauer, R.T.
Nucleotide Binding and Conformational Switching in the Hexameric Ring of a AAA+ Machine.
Cell(Cambridge,Mass.), 153:628-639, 2013

PubMed Abstract: ClpX, a AAA+ ring homohexamer, uses the energy of ATP binding and hydrolysis to power conformational changes that unfold and translocate target proteins into the ClpP peptidase for degradation. In multiple crystal structures, some ClpX subunits adopt nucleotide-loadable conformations, others adopt unloadable conformations, and each conformational class exhibits substantial variability. Using mutagenesis of individual subunits in covalently tethered hexamers together with fluorescence methods to assay the conformations and nucleotide-binding properties of these subunits, we demonstrate that dynamic interconversion between loadable and unloadable conformations is required to couple ATP hydrolysis by ClpX to mechanical work. ATP binding to different classes of subunits initially drives staged allosteric changes, which set the conformation of the ring to allow hydrolysis and linked mechanical steps. Subunit switching between loadable and unloadable conformations subsequently isomerizes or resets the configuration of the nucleotide-loaded ring and is required for mechanical function.

PubMed: 23622246
DOI: 10.1016/j.cell.2013.03.029

実験手法

X-RAY DIFFRACTION (4.4787 Å)