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-Structure paper
タイトル | Newly folded substrates inside the molecular cage of the HtrA chaperone DegQ. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 19, Issue 2, Page 152-157, Year 2012 |
掲載日 | 2012年1月15日 |
著者 | Hélène Malet / Flavia Canellas / Justyna Sawa / Jun Yan / Konstantinos Thalassinos / Michael Ehrmann / Tim Clausen / Helen R Saibil / |
PubMed 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. |
リンク | Nat Struct Mol Biol / PubMed:22245966 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 7.5 - 28 Å |
構造データ | EMDB-1981, PDB-4a8a: EMDB-1982, PDB-4a8b: EMDB-1983, PDB-4a8c: EMDB-1984, PDB-4a9g: PDB-4a8d: |
由来 |
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キーワード | HYDROLASE/HYDROLASE / HYDROLASE-HYDROLASE COMPLEX / CHAPERONE / HYDROLASE / HYDROLASE/TRANSPORT PROTEIN / HYDROLASE-TRANSPORT PROTEIN COMPLEX |