ジャーナル: Proc Natl Acad Sci U S A / 年: 2025 タイトル: Structure of the virulence-associated filamentous bacteriophage MDAΦ. 著者: Jan Böhning / Miles Graham / Mathieu Coureuil / Abul K Tarafder / Julie Meyer / Xavier Nassif / Emmanuelle Bille / Tanmay A M Bharat / 要旨: is a human commensal bacterium that can opportunistically invade the bloodstream and cross the blood-brain barrier, where it can cause septicemia and meningitis. These diseases, if left untreated, ... is a human commensal bacterium that can opportunistically invade the bloodstream and cross the blood-brain barrier, where it can cause septicemia and meningitis. These diseases, if left untreated, can be lethal within hours. Hyperinvasive strains often express a genomically encoded filamentous bacteriophage called MDAΦ, which promotes colonization of mucosal host surfaces to facilitate bacterial invasion. How this phage is organized and how it promotes biofilm formation and infection at the molecular level is unclear. Here, we present an electron cryomicroscopy structure of the MDA phage, showing that MDAΦ is a class I filamentous inovirus, with the major capsid protein (MCP) arranged within the phage as a highly curved and densely packed α-helix. Comparison with other filamentous bacteriophages offers clues about inoviral genome encapsidation mechanisms, providing a framework for understanding the evolutionary diversity of inoviruses. A disordered, N-terminal segment in the MCP presents hydrophobic patches on the surface of assembled phage particles, which, together with electron cryotomography data of phage bundles, furnishes a structural rationale for phage-phage interactions that were seen previously in an epithelium adhesion infection model of . Taken together, our results shed light on the structure, organization, and higher-order assembly of a biomedically relevant phage encoded in the genome of a human pathogen. Molecular insights gleaned from this study increase our understanding of phage evolution, phage-mediated bacterial adhesion, and pathogenicity.
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回転角度/サブユニット: 42.2769 ° / 軸方向距離/サブユニット: 14.1313 Å / らせん対称軸の対称性: C5
3次元再構成
解像度: 3.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 27134 / アルゴリズム: FOURIER SPACE / 対称性のタイプ: HELICAL
原子モデル構築
プロトコル: AB INITIO MODEL / 空間: REAL / 詳細: PHENIX and Servalcat was used
精密化
解像度: 3.7→138.43 Å / Cor.coef. Fo:Fc: 0.923 / SU B: 45.1 / SU ML: 0.618 / ESU R: 0.207 立体化学のターゲット値: MAXIMUM LIKELIHOOD WITH PHASES 詳細: HYDROGENS HAVE BEEN USED IF PRESENT IN THE INPUT