+検索条件
-Structure paper
| タイトル | Structure of defense against restriction proteins DarA and Hdf in phage P1 reveals a new molecular mechanism during phage assembly, infection and DNA ejection. |
|---|---|
| ジャーナル・号・ページ | PLoS Pathog, Vol. 22, Issue 1, Page e1013869, Year 2026 |
| 掲載日 | 2026年1月16日 |
著者 | Jing Zheng / Yuan Chen / Siting Chen / Junquan Zhou / Hao Xiao / Fan Yang / Hongrong Liu / ![]() |
| PubMed 要旨 | The continuous "arms race" between bacterial antiviral defense systems and phage anti-defense strategies drives evolutionary innovation. Previous study indicated that the defense against restriction ...The continuous "arms race" between bacterial antiviral defense systems and phage anti-defense strategies drives evolutionary innovation. Previous study indicated that the defense against restriction (Dar) proteins DarA and Hdf in myophage P1 are associated with the head morphogenesis. However, the structural information for these proteins was lacking, and the mechanisms by which they mediate head morphogenesis and protect phage DNA against bacterial defense systems remained poorly understood. Using cryo-electron microscopy (cryo-EM), we resolved the entire structures of extended P1 and contracted P1 with partial DNA, with the latter lacking the baseplate, as well as the head structure of contracted P1 without DNA. We identified the structural proteins for the P1, including the head, connector complex, and baseplate, which exhibited conserved properties among the majority of myophages with a simple baseplate. Notably, 55 DarA-Hdf pairs are attached to the inner surface of head at each penton-hexon junction in the extended P1 and contracted P1 with partial DNA. The DarA and Hdf together form a complex that is tightly bound to the capsid and interacts with the DNA. However, these pairs are absent in the contracted P1 without DNA. Based on our three states of P1, we hypothesis that these extensive interactions among DarA, Hdf, DNA, and head play crucial roles in mediating capsid assembly, enhancing capsid stability, and protecting phage DNA. Our results provide a structural basis for further exploration of the mechanism by which Dar proteins function during phage assembly, infection and DNA ejection. This molecular mechanism may be conserved among P1-like phages. |
リンク | PLoS Pathog / PubMed:41544131 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.2 - 7.3 Å |
| 構造データ | EMDB-64249, PDB-9ukm: EMDB-64293, PDB-9ums: EMDB-65154, PDB-9vl4: ![]() EMDB-65450: Cryo-EM structure of the connector of contracted P1 EMDB-65454, PDB-9vyi: EMDB-65475, PDB-9vz0: EMDB-65480, PDB-9vzk: ![]() EMDB-65496: Cryo-EM structure of the head of phage P1 in the released state |
| 由来 |
|
キーワード | VIRAL PROTEIN / head / phage / connector / phag / baseplate / contracted phage P1 |
ムービー
コントローラー
構造ビューア
万見文献について



著者
リンク













escherichia phage p1 (ファージ)
キーワード