ジャーナル: Mol Microbiol / 年: 2006 タイトル: Double hexameric ring assembly of the type III protein translocase ATPase HrcN. 著者: Shirley A Müller / Charalambos Pozidis / Remington Stone / Christian Meesters / Mohamed Chami / Andreas Engel / Anastassios Economou / Henning Stahlberg / 要旨: The specialized type III secretion (T3S) apparatus of pathogenic and symbiotic Gram-negative bacteria comprises a complex transmembrane organelle and an ATPase homologous to the F1-ATPase beta ...The specialized type III secretion (T3S) apparatus of pathogenic and symbiotic Gram-negative bacteria comprises a complex transmembrane organelle and an ATPase homologous to the F1-ATPase beta subunit. The T3S ATPase HrcN of Pseudomonas syringae associates with the inner membrane, and its ATP hydrolytic activity is stimulated by dodecamerization. The structure of dodecameric HrcN (HrcN12) determined to 1.6 nm by cryo-electron microscopy is presented. HrcN12 comprises two hexameric rings that are probably stacked face-to-face by the association of their C-terminal domains. It is 11.5 +/- 1.0 nm in diameter, 12.0 +/- 2.0 nm high and has a 2.0-3.8 nm wide inner channel. This structure is compared to a homology model based on the structure of the F1-beta-ATPase. A model for its incorporation within the T3S apparatus is presented.
名称: HrcN / タイプ: sample / ID: 1000 詳細: The sample had a tendency to aggregate rapidly. Images were usually highly crowded, or empty, from the same cryo-EM grid. 集合状態: homododecamer / Number unique components: 1