- PDB-8ti8: CryoEM structure of Shedu from Bacillus cereus -
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基本情報
登録情報
データベース: PDB / ID: 8ti8
タイトル
CryoEM structure of Shedu from Bacillus cereus
要素
Shedu protein SduA
キーワード
DNA BINDING PROTEIN / Shedu / DUF4263 / Bacterial defense systems / Nuclease / Anti-plasmid defense system / PD-(D/E)XK nuclease / Whirly domain / Two-component signaling
機能・相同性
Protein of unknown function DUF4263 / : / Shedu protein SduA, C-terminal / Shedu protein SduA, N-terminal / nuclease activity / defense response to virus / Shedu protein SduA
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R35 GM144121
米国
引用
ジャーナル: Mol Cell / 年: 2025 タイトル: Bacterial Shedu immune nucleases share a common enzymatic core regulated by diverse sensor domains. 著者: Yajie Gu / Huan Li / Amar Deep / Eray Enustun / Dapeng Zhang / Kevin D Corbett / 要旨: Prokaryotes possess diverse anti-bacteriophage immune systems, including the single-protein Shedu nuclease. Here, we reveal the structural basis for activation of Bacillus cereus Shedu. Two ...Prokaryotes possess diverse anti-bacteriophage immune systems, including the single-protein Shedu nuclease. Here, we reveal the structural basis for activation of Bacillus cereus Shedu. Two cryoelectron microscopy structures of Shedu show that it switches between inactive and active states through conformational changes affecting active-site architecture, which are controlled by the protein's N-terminal domain (NTD). We find that B. cereus Shedu cleaves near DNA ends with a 3' single-stranded overhang, likely enabling it to specifically degrade the DNA injected by certain bacteriophages. Bioinformatic analysis of Shedu homologs reveals a conserved nuclease domain with remarkably diverse N-terminal regulatory domains: we identify 79 distinct NTD types falling into eight broad classes, including those with predicted nucleic acid binding, enzymatic, and other activities. Together, these data reveal Shedu as a broad family of immune nucleases with a common nuclease core regulated by diverse NTDs that likely respond to a range of signals.
履歴
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2023年7月19日
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