National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01-GM127593
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2024 タイトル: The LexA-RecA* structure reveals a cryptic lock-and-key mechanism for SOS activation. 著者: Michael B Cory / Allen Li / Christina M Hurley / Peter J Carman / Ruth A Pumroy / Zachary M Hostetler / Ryann M Perez / Yarra Venkatesh / Xinning Li / Kushol Gupta / E James Petersson / Rahul M Kohli / 要旨: The bacterial SOS response plays a key role in adaptation to DNA damage, including genomic stress caused by antibiotics. SOS induction begins when activated RecA*, an oligomeric nucleoprotein ...The bacterial SOS response plays a key role in adaptation to DNA damage, including genomic stress caused by antibiotics. SOS induction begins when activated RecA*, an oligomeric nucleoprotein filament that forms on single-stranded DNA, binds to and stimulates autoproteolysis of the repressor LexA. Here, we present the structure of the complete Escherichia coli SOS signal complex, constituting full-length LexA bound to RecA*. We uncover an extensive interface unexpectedly including the LexA DNA-binding domain, providing a new molecular rationale for ordered SOS gene induction. We further find that the interface involves three RecA subunits, with a single residue in the central engaged subunit acting as a molecular key, inserting into an allosteric binding pocket to induce LexA cleavage. Given the pro-mutagenic nature of SOS activation, our structural and mechanistic insights provide a foundation for developing new therapeutics to slow the evolution of antibiotic resistance.
選択した数: 3423408 / ソフトウェア - 名称: cryoSPARC (ver. 4.0.3) / ソフトウェア - 詳細: Filament Tracer 詳細: cryoSPARC automated Filament Tracer using filament diameter of 100A, 17A separation between segments. Minimum and maximum filament diameters of 90A, 150A respectively. Inspect Picks to filter ...詳細: cryoSPARC automated Filament Tracer using filament diameter of 100A, 17A separation between segments. Minimum and maximum filament diameters of 90A, 150A respectively. Inspect Picks to filter particles with high curvature or sinuosity Local power > 567.940 Local power < 5711.103 Curvature (1/A) < 0.005970 Sinuosity < 1.393924 Low pass filtered particles near micrograph edge.
初期モデル
モデルのタイプ: NONE
最終 角度割当
タイプ: NOT APPLICABLE
FSC曲線 (解像度の算出)
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原子モデル構築 1
初期モデル
Chain - Source name: AlphaFold / Chain - Initial model type: in silico model 詳細: The initial model was generated via benchling plugin for full-length construct sequence
精密化
空間: REAL / プロトコル: RIGID BODY FIT
得られたモデル
PDB-8trg: Structure of full-length LexA bound to a RecA filament