ジャーナル: Sci Rep / 年: 2019 タイトル: Structural basis of translation inhibition by cadazolid, a novel quinoxolidinone antibiotic. 著者: Alain Scaiola / Marc Leibundgut / Daniel Boehringer / Patrick Caspers / Daniel Bur / Hans H Locher / Georg Rueedi / Daniel Ritz / 要旨: Oxazolidinones are synthetic antibiotics used for treatment of infections caused by Gram-positive bacteria. They target the bacterial protein synthesis machinery by binding to the peptidyl ...Oxazolidinones are synthetic antibiotics used for treatment of infections caused by Gram-positive bacteria. They target the bacterial protein synthesis machinery by binding to the peptidyl transferase centre (PTC) of the ribosome and interfering with the peptidyl transferase reaction. Cadazolid is the first member of quinoxolidinone antibiotics, which are characterized by combining the pharmacophores of oxazolidinones and fluoroquinolones, and it is evaluated for treatment of Clostridium difficile gastrointestinal infections that frequently occur in hospitalized patients. In vitro protein synthesis inhibition by cadazolid was shown in Escherichia coli and Staphylococcus aureus, including an isolate resistant against linezolid, the prototypical oxazolidinone antibiotic. To better understand the mechanism of inhibition, we determined a 3.0 Å cryo-electron microscopy structure of cadazolid bound to the E. coli ribosome in complex with mRNA and initiator tRNA. Here we show that cadazolid binds with its oxazolidinone moiety in a binding pocket in close vicinity of the PTC as observed previously for linezolid, and that it extends its unique fluoroquinolone moiety towards the A-site of the PTC. In this position, the drug inhibits protein synthesis by interfering with the binding of tRNA to the A-site, suggesting that its chemical features also can enable the inhibition of linezolid-resistant strains.
全体 : Structure of a bacterial 70S ribosomal subunit in complex with ca...
全体
名称: Structure of a bacterial 70S ribosomal subunit in complex with cadazolid, reconstruction focused around the 30S ribosomal subunit
要素
複合体: Structure of a bacterial 70S ribosomal subunit in complex with cadazolid, reconstruction focused around the 30S ribosomal subunit
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超分子 #1: Structure of a bacterial 70S ribosomal subunit in complex with ca...
超分子
名称: Structure of a bacterial 70S ribosomal subunit in complex with cadazolid, reconstruction focused around the 30S ribosomal subunit タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#31
由来(天然)
生物種: Escherichia coli (大腸菌)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
単粒子再構成法
試料の集合状態
particle
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試料調製
緩衝液
pH: 7.4
凍結
凍結剤: ETHANE-PROPANE / チャンバー内湿度: 100 % / チャンバー内温度: 277 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: FEI FALCON II (4k x 4k) 検出モード: INTEGRATING / 平均電子線量: 1.14 e/Å2