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-Structure paper
| タイトル | Architecture of the Sap S-layer of revealed by integrative structural biology. |
|---|---|
| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 121, Issue 51, Page e2415351121, Year 2024 |
| 掲載日 | 2024年12月17日 |
著者 | Adrià Sogues / Kendra Leigh / Ethan V Halingstad / Sander E Van der Verren / Adam J Cecil / Antonella Fioravanti / Alexander J Pak / Misha Kudryashev / Han Remaut / ![]() |
| PubMed 要旨 | is a spore-forming gram-positive bacterium responsible for anthrax, an infectious disease with a high mortality rate and a target of concern due to bioterrorism and long-term site contamination. The ... is a spore-forming gram-positive bacterium responsible for anthrax, an infectious disease with a high mortality rate and a target of concern due to bioterrorism and long-term site contamination. The entire surface of vegetative cells in exponential or stationary growth phase is covered in proteinaceous arrays called S-layers, composed of Sap or EA1 protein, respectively. The Sap S-layer represents an important virulence factor and cell envelope support structure whose paracrystalline nature is essential for its function. However, the spatial organization of Sap in its lattice state remains elusive. Here, we employed cryoelectron tomography and subtomogram averaging to obtain a map of the Sap S-layer from tubular polymers that revealed a conformational switch between the postassembly protomers and the previously available X-ray structure of the condensed monomers. To build and validate an atomic model of the lattice within this map, we used a combination of molecular dynamics simulations, X-ray crystallography, cross-linking mass spectrometry, and biophysics in an integrative structural biology approach. The Sap lattice model produced recapitulates a close-to-physiological arrangement, reveals high-resolution details of lattice contacts, and sheds light on the mechanisms underlying the stability of the Sap layer. |
リンク | Proc Natl Acad Sci U S A / PubMed:39652757 / PubMed Central |
| 手法 | EM (サブトモグラム平均) / X線回折 |
| 解像度 | 2.01 - 7.2 Å |
| 構造データ | EMDB-45459: Structure of in vitro assembled B. anthracis S-layer protein Sap ![]() PDB-8rx2: ![]() PDB-8s80: ![]() PDB-8s83: |
| 化合物 | ![]() ChemComp-HOH: |
| 由来 |
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キーワード | STRUCTURAL PROTEIN / S-layer / Sap / Bacillus anthracis / anthracis / anthrax / exoskeleton / surface array |
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