ジャーナル: Nat Commun / 年: 2022 タイトル: Structure and assembly of the S-layer in C. difficile. 著者: Paola Lanzoni-Mangutchi / Oishik Banerji / Jason Wilson / Anna Barwinska-Sendra / Joseph A Kirk / Filipa Vaz / Shauna O'Beirne / Arnaud Baslé / Kamel El Omari / Armin Wagner / Neil F ...著者: Paola Lanzoni-Mangutchi / Oishik Banerji / Jason Wilson / Anna Barwinska-Sendra / Joseph A Kirk / Filipa Vaz / Shauna O'Beirne / Arnaud Baslé / Kamel El Omari / Armin Wagner / Neil F Fairweather / Gillian R Douce / Per A Bullough / Robert P Fagan / Paula S Salgado / 要旨: Many bacteria and archaea possess a two-dimensional protein array, or S-layer, that covers the cell surface and plays crucial roles in cell physiology. Here, we report the crystal structure of SlpA, ...Many bacteria and archaea possess a two-dimensional protein array, or S-layer, that covers the cell surface and plays crucial roles in cell physiology. Here, we report the crystal structure of SlpA, the main S-layer protein of the bacterial pathogen Clostridioides difficile, and use electron microscopy to study S-layer organisation and assembly. The SlpA crystal lattice mimics S-layer assembly in the cell, through tiling of triangular prisms above the cell wall, interlocked by distinct ridges facing the environment. Strikingly, the array is very compact, with pores of only ~10 Å in diameter, compared to other S-layers (30-100 Å). The surface-exposed flexible ridges are partially dispensable for overall structure and assembly, although a mutant lacking this region becomes susceptible to lysozyme, an important molecule in host defence. Thus, our work gives insights into S-layer organisation and provides a basis for development of C. difficile-specific therapeutics.
根拠: gel filtration, LMW SLP forms a heterodimer with HMW SLP via interacting domains LID and HID respectively. ELISA assay confirms complex formation (Fagan et al., Mol Micro, 2009)
Chain B could not be fully traced in the electron density maps, with considerable regions beyond ...Chain B could not be fully traced in the electron density maps, with considerable regions beyond residue 110 not modelled.
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実験情報
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実験
実験
手法: X線回折 / 使用した結晶の数: 1
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試料調製
結晶
マシュー密度: 2.48 Å3/Da / 溶媒含有率: 50.44 %
結晶化
温度: 293 K / 手法: 蒸気拡散法, シッティングドロップ法 / 詳細: 0.2 M ammonium sulphate, 0.1 M MES pH6.5, 35 % MPD