National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R01AI78000
米国
引用
ジャーナル: Nat Commun / 年: 2021 タイトル: Cryo-EM structure of Helicobacter pylori urease with an inhibitor in the active site at 2.0 Å resolution. 著者: Eva S Cunha / Xiaorui Chen / Marta Sanz-Gaitero / Deryck J Mills / Hartmut Luecke / 要旨: Infection of the human stomach by Helicobacter pylori remains a worldwide problem and greatly contributes to peptic ulcer disease and gastric cancer. Without active intervention approximately 50% of ...Infection of the human stomach by Helicobacter pylori remains a worldwide problem and greatly contributes to peptic ulcer disease and gastric cancer. Without active intervention approximately 50% of the world population will continue to be infected with this gastric pathogen. Current eradication, called triple therapy, entails a proton-pump inhibitor and two broadband antibiotics, however resistance to either clarithromycin or metronidazole is greater than 25% and rising. Therefore, there is an urgent need for a targeted, high-specificity eradication drug. Gastric infection by H. pylori depends on the expression of a nickel-dependent urease in the cytoplasm of the bacteria. Here, we report the 2.0 Å resolution structure of the 1.1 MDa urease in complex with an inhibitor by cryo-electron microscopy and compare it to a β-mercaptoethanol-inhibited structure at 2.5 Å resolution. The structural information is of sufficient detail to aid in the development of inhibitors with high specificity and affinity.
凍結剤: ETHANE / チャンバー内湿度: 70 % / チャンバー内温度: 283 K / 装置: FEI VITROBOT MARK IV
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 撮影したグリッド数: 1 / 実像数: 956 / 平均電子線量: 50.0 e/Å2 / 詳細: Used 718 movies
電子線
加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN
電子光学系
照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD
実験機器
モデル: Titan Krios / 画像提供: FEI Company
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画像解析
粒子像選択
選択した数: 203000
初期モデル
モデルのタイプ: OTHER 詳細: 2.45 angstroms EM structure with BME bound that in turn was modeled from the 3.0 angstroms apo form of the crystal structure PBD 1E9Z
最終 再構成
使用したクラス数: 1 / 想定した対称性 - 点群: T (正4面体型対称) / 解像度のタイプ: BY AUTHOR / 解像度: 2.0 Å / 解像度の算出法: FSC 0.5 CUT-OFF / ソフトウェア - 名称: RELION (ver. 3.0 beta) / 詳細: Relion was used for resconstruction / 使用した粒子像数: 187461