Journal: Nat Commun / Year: 2022 Title: Structure and assembly of the S-layer in C. difficile. Authors: 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 ...Authors: 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 / Abstract: 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.
Method to determine structure: AB INITIO PHASING / Resolution: 1.5→52.01 Å / Cor.coef. Fo:Fc: 0.973 / Cor.coef. Fo:Fc free: 0.961 / SU B: 4.506 / SU ML: 0.07 / Cross valid method: THROUGHOUT / ESU R: 0.088 / ESU R Free: 0.076 / Stereochemistry target values: MAXIMUM LIKELIHOOD Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS U VALUES : REFINED INDIVIDUALLY
Rfactor
Num. reflection
% reflection
Selection details
Rfree
0.2045
1644
5 %
RANDOM
Rwork
0.164
-
-
-
obs
0.166
31378
96.55 %
-
Solvent computation
Ion probe radii: 0.7 Å / Shrinkage radii: 0.7 Å / VDW probe radii: 1.3 Å / Solvent model: MASK
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