ジャーナル: Nat Commun / 年: 2025 タイトル: Phage parasites targeting phage homologous recombinases provide antiviral immunity. 著者: Gianluca Debiasi-Anders / Cuncun Qiao / Amrita Salim / Na Li / Ignacio Mir-Sanchis / 要旨: Bacteria often carry multiple genes encoding anti-phage defense systems, clustered in defense islands and phage satellites. Various unrelated anti-phage defense systems target phage-encoded ...Bacteria often carry multiple genes encoding anti-phage defense systems, clustered in defense islands and phage satellites. Various unrelated anti-phage defense systems target phage-encoded homologous recombinases (HRs) through unclear mechanisms. Here, we show that the phage satellite SaPI2, which does not encode orthodox anti-phage defense systems, provides antiviral immunity mediated by Stl2, the SaPI2-encoded transcriptional repressor. Stl2 targets and inhibits phage-encoded HRs, including Sak and Sak4, two HRs from the Rad52-like and Rad51-like superfamilies. Remarkably, apo Stl2 forms a collar of dimers oligomerizing as closed rings and as filaments, mimicking the quaternary structure of its targets. Stl2 decorates both Sak rings and Sak4 filaments. The oligomerization of Stl2 as a collar of dimers is necessary for its inhibitory activity both in vitro and in vivo. Our results shed light on the mechanisms underlying antiviral immunity against phages carrying divergent HRs.
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#241 - 2020年1月 20年の分子を振り返って (Twenty Years of Molecules) 類似性 (3)
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集合体
登録構造単位
A: Helix-turn-helix XRE family protein B: Helix-turn-helix XRE family protein C: Helix-turn-helix XRE family protein D: Helix-turn-helix XRE family protein E: Helix-turn-helix XRE family protein F: Helix-turn-helix XRE family protein G: Helix-turn-helix XRE family protein H: Helix-turn-helix XRE family protein
平均露光時間: 3.02 sec. / 電子線照射量: 50 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 撮影したグリッド数: 53 / 実像数: 6233
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EMソフトウェア
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1
cryoSPARC
粒子像選択
2
EPU
2.13.0
画像取得
4
cryoSPARC
v4.2.1
CTF補正
7
Coot
9.03
モデルフィッティング
9
PHENIX
1.20.1-4487-000
モデル精密化
10
cryoSPARC
v4.2.1
初期オイラー角割当
12
cryoSPARC
v4.2.1
分類
13
cryoSPARC
v4.2.1
3次元再構成
CTF補正
詳細: Estimate and correct for full-frame motion (eg. stage drift) as well as sample deformation (local motion) by Cryosparc Patch Motion Correction. タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION