ジャーナル: Biochem J / 年: 2013 タイトル: Structure and mechanism of the PilF DNA transformation ATPase from Thermus thermophilus. 著者: Richard F Collins / Darin Hassan / Vijaykumar Karuppiah / Angela Thistlethwaite / Jeremy P Derrick / 要旨: Many Gram-negative bacteria contain specific systems for uptake of foreign DNA, which play a critical role in the acquisition of antibiotic resistance. The TtPilF (PilF ATPase from Thermus ...Many Gram-negative bacteria contain specific systems for uptake of foreign DNA, which play a critical role in the acquisition of antibiotic resistance. The TtPilF (PilF ATPase from Thermus thermophilus) is required for high transformation efficiency, but its mechanism of action is unknown. In the present study, we show that TtPilF is able to bind to both DNA and RNA. The structure of TtPilF was determined by cryoelectron microscopy in the presence and absence of the ATP analogue p[NH]ppA (adenosine 5'-[β,γ-imido]triphosphate), at 10 and 12 Å (1 Å=0.1 nm) resolutions respectively. It consists of two distinct N- and C-terminal regions, separated by a short stem-like structure. Binding of p[NH]ppA induces structural changes in the C-terminal domains, which are transmitted via the stem to the N-terminal domains. Molecular models were generated for the apoenzyme and p[NH]ppA-bound states in the C-terminal regions by docking of a model based on a crystal structure from a closely related enzyme. Analysis of DNA binding by electron microscopy, using gold labelling, localized the binding site to the N-terminal domains. The results suggest a model in which DNA uptake by TtPilF is powered by ATP hydrolysis, causing conformational changes in the C-terminal domains, which are transmitted via the stem to take up DNA into the cell.
pH: 6.5 / 詳細: 50mM Mes pH 6.5, 200mM NaCl and 10mM MgCl2
グリッド
詳細: Freshly glow discharged 2-2 Quantifoil grids
凍結
凍結剤: ETHANE / チャンバー内湿度: 90 % / 装置: FEI VITROBOT MARK IV 手法: continuously blotted for 4-5 seconds in a 90% humidity chamber before plunge freezing into liquid ethane at 22 degrees.
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電子顕微鏡法
顕微鏡
FEI POLARA 300
温度
平均: 85 K
特殊光学系
エネルギーフィルター - 名称: FEI
日付
2011年10月1日
撮影
デジタル化 - サンプリング間隔: 3.5 µm / 実像数: 108 / 平均電子線量: 20 e/Å2 / 詳細: Data were recorded on a Gatan 4Kx4K CCD / ビット/ピクセル: 8