- EMDB-43105: Map of the AriA homohexamer following release of the AriB effecto... -
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基本情報
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データベース: EMDB / ID: EMD-43105
タイトル
Map of the AriA homohexamer following release of the AriB effector during PARIS-mediated defense.
マップデータ
Sharpened map of the AriA homohexamer.
試料
複合体: Map of AriA homohexamer obtained from pulldowns of PARIS-Ocr coexpression showing AriB dissociated from AriA upon activation of the PARIS defense system.
タンパク質・ペプチド: AriA, ABC ATPase and sensor of PARIS immunity.
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM134867
米国
引用
ジャーナル: Nature / 年: 2024 タイトル: A virally encoded tRNA neutralizes the PARIS antiviral defence system. 著者: Nathaniel Burman / Svetlana Belukhina / Florence Depardieu / Royce A Wilkinson / Mikhail Skutel / Andrew Santiago-Frangos / Ava B Graham / Alexei Livenskyi / Anna Chechenina / Natalia ...著者: Nathaniel Burman / Svetlana Belukhina / Florence Depardieu / Royce A Wilkinson / Mikhail Skutel / Andrew Santiago-Frangos / Ava B Graham / Alexei Livenskyi / Anna Chechenina / Natalia Morozova / Trevor Zahl / William S Henriques / Murat Buyukyoruk / Christophe Rouillon / Baptiste Saudemont / Lena Shyrokova / Tatsuaki Kurata / Vasili Hauryliuk / Konstantin Severinov / Justine Groseille / Agnès Thierry / Romain Koszul / Florian Tesson / Aude Bernheim / David Bikard / Blake Wiedenheft / Artem Isaev / 要旨: Viruses compete with each other for limited cellular resources, and some deliver defence mechanisms that protect the host from competing genetic parasites. The phage antirestriction induced system ...Viruses compete with each other for limited cellular resources, and some deliver defence mechanisms that protect the host from competing genetic parasites. The phage antirestriction induced system (PARIS) is a defence system, often encoded in viral genomes, that is composed of a 55 kDa ABC ATPase (AriA) and a 35 kDa TOPRIM nuclease (AriB). However, the mechanism by which AriA and AriB function in phage defence is unknown. Here we show that AriA and AriB assemble into a 425 kDa supramolecular immune complex. We use cryo-electron microscopy to determine the structure of this complex, thereby explaining how six molecules of AriA assemble into a propeller-shaped scaffold that coordinates three subunits of AriB. ATP-dependent detection of foreign proteins triggers the release of AriB, which assembles into a homodimeric nuclease that blocks infection by cleaving host lysine transfer RNA. Phage T5 subverts PARIS immunity through expression of a lysine transfer RNA variant that is not cleaved by PARIS, thereby restoring viral infection. Collectively, these data explain how AriA functions as an ATP-dependent sensor that detects viral proteins and activates the AriB toxin. PARIS is one of an emerging set of immune systems that form macromolecular complexes for the recognition of foreign proteins, rather than foreign nucleic acids.
全体 : Map of AriA homohexamer obtained from pulldowns of PARIS-Ocr coex...
全体
名称: Map of AriA homohexamer obtained from pulldowns of PARIS-Ocr coexpression showing AriB dissociated from AriA upon activation of the PARIS defense system.
要素
複合体: Map of AriA homohexamer obtained from pulldowns of PARIS-Ocr coexpression showing AriB dissociated from AriA upon activation of the PARIS defense system.
タンパク質・ペプチド: AriA, ABC ATPase and sensor of PARIS immunity.
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超分子 #1: Map of AriA homohexamer obtained from pulldowns of PARIS-Ocr coex...
超分子
名称: Map of AriA homohexamer obtained from pulldowns of PARIS-Ocr coexpression showing AriB dissociated from AriA upon activation of the PARIS defense system. タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
由来(天然)
生物種: Escherichia coli B185 (大腸菌)
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分子 #1: AriA, ABC ATPase and sensor of PARIS immunity.
分子
名称: AriA, ABC ATPase and sensor of PARIS immunity. / タイプ: protein_or_peptide / ID: 1 / 光学異性体: LEVO
選択した数: 4415782 / 詳細: Particles Extracted for initial classification
初期モデル
モデルのタイプ: NONE 詳細: Multiclass ab-initio reconstructions were used to sort 667,479 particle images from 7 selected 2-D classes and obtain a consensus refinement.
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 4.41) / ソフトウェア - 詳細: Ab-Initio Reconstruction 詳細: Further particle sorting yielded a class of 392989 particles that were further sorted by an additional round of 2-D classification.
クラス数: 50 / 平均メンバー数/クラス: 9169 / ソフトウェア - 名称: cryoSPARC (ver. 4.41) / ソフトウェア - 詳細: Heterogenous Refinement 詳細: From a classification of 264,881 particles, 11 classes containing 100,862 particles were kept for further processing. These 100,862 particles were input to a 2-class ab initio reconstruction, ...詳細: From a classification of 264,881 particles, 11 classes containing 100,862 particles were kept for further processing. These 100,862 particles were input to a 2-class ab initio reconstruction, followed by a 2 class heterogenous refinement to yield the final stack of 62,732 particles for the final reconstruction.
chain_id: C, source_name: PDB, initial_model_type: experimental model
8UX9 contains two molecules of AriA. This reconstruction lacks the AriB subunit and contains 3 copies of chain C from the asymmetric unit.
詳細
Rigid body fitting was done using the fitmap command in ChimeraX to dock 3 copies of the experimentally determined structure of the asymmetric unit into the density map of the fully assembled complex.
精密化
空間: RECIPROCAL / プロトコル: RIGID BODY FIT / 温度因子: 158.6 当てはまり具合の基準: Cross-correlation coefficient