#1: ジャーナル: Commun Biol / 年: 2025 タイトル: Structural basis for Salmonella infection by two Microviridae phages. 著者: Wanlong Hu / Zhengjie Liu / Yuming Wei / Qucheng Bian / Weiqi Lan / Chongzheng Fan / Jiaoyang Song / Qianqian Sun / Xiaojie Zhang / Yuqing Liu / Yan Gao / Yibao Chen / 要旨: The global resurgence of multidrug-resistant Salmonella species, responsible for millions of annual infections, underscores the urgent need for alternative antimicrobial strategies, such as phage ...The global resurgence of multidrug-resistant Salmonella species, responsible for millions of annual infections, underscores the urgent need for alternative antimicrobial strategies, such as phage therapy. Microviridae phages offer a promising model for studying phage-host interactions with their unique structural and infection mechanisms. Here, we identify two Microviridae phages, PJNS001 and PJNS002, with different host receptor dependencies, and determine their cryo-EM structures at 2.68 Å and 2.59 Å resolution, respectively. These icosahedral capsids with T = 1 symmetry exhibit a unique vertex reinforcement mechanism, stabilizing the viral assembly. The specific pentameric adaptations, coupled with DNA binding protein engagements and thermodynamic constraints, collectively preclude the formation of hybrid virions. Structural analysis and in situ visualization reveal spike protein features and host-attachment intermediates, informing host specificity. Together, these findings advance our understanding of Microviridae infection mechanisms and provide a structural framework for rational phage design against antibiotic-resistant pathogens.
プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray
放射波長
波長: 0.97954 Å / 相対比: 1
反射
解像度: 2.42→48.66 Å / Num. obs: 46470 / % possible obs: 99.77 % / 冗長度: 6.6 % / Rmerge(I) obs: 0.1022 / Net I/σ(I): 9.2
反射 シェル
解像度: 2.42→2.51 Å / Rmerge(I) obs: 0.4262 / Mean I/σ(I) obs: 3.45 / Num. unique obs: 4553
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解析
ソフトウェア
名称
バージョン
分類
REFMAC
5.8.0267
精密化
PDB_EXTRACT
データ抽出
PHASES
位相決定
PHENIX
1.17
精密化
精密化
構造決定の手法: 分子置換 / 解像度: 2.42→48.66 Å / Cor.coef. Fo:Fc: 0.935 / Cor.coef. Fo:Fc free: 0.885 / SU B: 9.752 / SU ML: 0.222 / 交差検証法: THROUGHOUT / ESU R: 0.606 / ESU R Free: 0.294 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
Rfactor
反射数
%反射
Selection details
Rfree
0.25664
2325
5 %
RANDOM
Rwork
0.19225
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-
-
obs
0.1955
44157
99.7 %
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溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK