- EMDB-1982: Symmetrized cryo-EM reconstruction of E. coli DegQ 12-mer in comp... -
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基本情報
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データベース: EMDB / ID: EMD-1982
タイトル
Symmetrized cryo-EM reconstruction of E. coli DegQ 12-mer in complex with lysozymes
マップデータ
Symmetrized cryo-EM map of Escherichia coli DegQ 12-mer in complex with lysozymes
試料
試料: Escherichia coli DegQ 12-mer in complex with lysozyme substrates
タンパク質・ペプチド: DegQ
タンパク質・ペプチド: Lysozyme
キーワード
Chaperone / Protease
機能・相同性
機能・相同性情報
peptidase Do / protein quality control for misfolded or incompletely synthesized proteins / proteolysis involved in protein catabolic process / Lactose synthesis / Antimicrobial peptides / Neutrophil degranulation / beta-N-acetylglucosaminidase activity / cell wall macromolecule catabolic process / lysozyme / lysozyme activity ...peptidase Do / protein quality control for misfolded or incompletely synthesized proteins / proteolysis involved in protein catabolic process / Lactose synthesis / Antimicrobial peptides / Neutrophil degranulation / beta-N-acetylglucosaminidase activity / cell wall macromolecule catabolic process / lysozyme / lysozyme activity / peptidase activity / defense response to Gram-negative bacterium / killing of cells of another organism / periplasmic space / defense response to Gram-positive bacterium / defense response to bacterium / serine-type endopeptidase activity / endoplasmic reticulum / proteolysis / extracellular space / identical protein binding / cytoplasm 類似検索 - 分子機能
Glycoside hydrolase, family 23 / Peptidase S1C, Do / Peptidase S1C / Trypsin-like peptidase domain / PDZ domain / PDZ domain profile. / Domain present in PSD-95, Dlg, and ZO-1/2. / PDZ domain / Glycoside hydrolase, family 22, lysozyme / PDZ superfamily ...Glycoside hydrolase, family 23 / Peptidase S1C, Do / Peptidase S1C / Trypsin-like peptidase domain / PDZ domain / PDZ domain profile. / Domain present in PSD-95, Dlg, and ZO-1/2. / PDZ domain / Glycoside hydrolase, family 22, lysozyme / PDZ superfamily / Glycoside hydrolase family 22 domain / Glycosyl hydrolases family 22 (GH22) domain signature. / Glycoside hydrolase, family 22 / C-type lysozyme/alpha-lactalbumin family / Glycosyl hydrolases family 22 (GH22) domain profile. / Alpha-lactalbumin / lysozyme C / Lysozyme-like domain superfamily / Peptidase S1, PA clan 類似検索 - ドメイン・相同性
ジャーナル: Nat Struct Mol Biol / 年: 2012 タイトル: Newly folded substrates inside the molecular cage of the HtrA chaperone DegQ. 著者: Hélène Malet / Flavia Canellas / Justyna Sawa / Jun Yan / Konstantinos Thalassinos / Michael Ehrmann / Tim Clausen / Helen R Saibil / 要旨: The HtrA protein family combines chaperone and protease activities and is essential for protein quality control in many organisms. Whereas the mechanisms underlying the proteolytic function of HtrA ...The HtrA protein family combines chaperone and protease activities and is essential for protein quality control in many organisms. Whereas the mechanisms underlying the proteolytic function of HtrA proteins are well characterized, their chaperone activity remains poorly understood. Here we describe cryo-EM structures of Escherichia coli DegQ in its 12- and 24-mer states in complex with model substrates, providing a structural model of HtrA chaperone action. Up to six lysozyme substrates bind inside the DegQ 12-mer cage and are visualized in a close-to-native state. An asymmetric reconstruction reveals the binding of a well-ordered lysozyme to four DegQ protomers. DegQ PDZ domains are located adjacent to substrate density and their presence is required for chaperone activity. The substrate-interacting regions appear conserved in 12- and 24-mer cages, suggesting a common mechanism of chaperone function.