2ZLE

Cryo-EM structure of DegP12/OMP

2ZLE の概要

• エントリーDOI: 10.2210/pdb2zle/pdb
• EMDBエントリー: 1505
• 分子名称: Protease do, Outer membrane protein C (2 entities in total)
• 機能のキーワード: degp, htra, protease, chaperone, pdz, outer membrane protein, omp, periplasm, hydrolase, serine protease, stress response, ion transport, phage recognition, porin, transmembrane, transport
• 由来する生物種: Escherichia coli; 詳細
• 細胞内の位置: Cell inner membrane ; Peripheral membrane protein ; Cytoplasmic side : P0C0V0; Cell outer membrane; Multi-pass membrane protein: P06996
• タンパク質・核酸の鎖数: 13
• 化学式量合計: 600763.35

構造登録者

Schaefer, E.,Saibil, H.R. (登録日: 2008-04-09, 公開日: 2008-06-03, 最終更新日: 2024-03-13)

主引用文献

Krojer, T.,Sawa, J.,Saibil, H.R.,Ehrmann, M.,Clausen, T.
Structural basis for the regulated protease and chaperone function of DegP
Nature, 453:885-890, 2008

PubMed Abstract: All organisms have to monitor the folding state of cellular proteins precisely. The heat-shock protein DegP is a protein quality control factor in the bacterial envelope that is involved in eliminating misfolded proteins and in the biogenesis of outer-membrane proteins. Here we describe the molecular mechanisms underlying the regulated protease and chaperone function of DegP from Escherichia coli. We show that binding of misfolded proteins transforms hexameric DegP into large, catalytically active 12-meric and 24-meric multimers. A structural analysis of these particles revealed that DegP represents a protein packaging device whose central compartment is adaptable to the size and concentration of substrate. Moreover, the inner cavity serves antagonistic functions. Whereas the encapsulation of folded protomers of outer-membrane proteins is protective and might allow safe transit through the periplasm, misfolded proteins are eliminated in the molecular reaction chamber. Oligomer reassembly and concomitant activation on substrate binding may also be critical in regulating other HtrA proteases implicated in protein-folding diseases.

PubMed: 18496527
DOI: 10.1038/nature07004

実験手法

ELECTRON MICROSCOPY (28 Å)