Cryo-EM structure of the RADAR supramolecular anti-phage defense complex.
Cryo-EM structure of the RADAR supramolecular anti-phage defense complex.
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雷达超分子抗流量防御复合物的冷冻EM结构。
DOI:
10.1016/j.cell.2023.01.012
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发表时间:
2023-03-02
期刊:
影响因子:
64.5
通讯作者:
Kranzusch, Philip J.
中科院分区:
文献类型:
--
作者:
Duncan-Lowey, Brianna;Tal, Nitzan;Johnson, Alex G.;Rawson, Shaun;Mayer, Megan L.;Doron, Shany;Millman, Adi;Melamed, Sarah;Fedorenko, Taya;Kacen, Assaf;Brandis, Alexander;Mehlman, Tevie;Amitai, Gil;Sorek, Rotem;Kranzusch, Philip J.
RADAR is a two-protein bacterial defense system that was reported to defend against phage by “editing” messenger RNA. Here, we determine cryo-EM structures of the RADAR defense complex, revealing RdrA as a heptameric, two-layered AAA+ ATPase and RdrB as a dodecameric, hollow complex with twelve surface-exposed deaminase active sites. RdrA and RdrB join to form a giant assembly up to 10 MDa, with RdrA docked as a funnel over the RdrB active site. Surprisingly, our structures reveal an RdrB active site that targets mononucleotides. We show that RdrB catalyzes ATP-to-ITP conversion in vitro and induces the massive accumulation of inosine mononucleotides during phage infection in vivo, limiting phage replication. Our results define ATP mononucleotide deamination as a determinant of RADAR immunity and reveal supramolecular assembly of a nucleotide-modifying machine as a mechanism of anti-phage defense. RADAR defense system inhibits phage replication through ATP deamination Cryo-EM structures reveal that RdrA and RdrB assemble to form a giant 10 MDa complex RdrB is an adenosine deaminase that catalyzes massive accumulation of ITP and dITP RdrA induces RdrB activity and may control sensing of phage infection In the RADAR system, the adenosine deaminase RdrB forms a giant complex with RdrA, and the RADAR supramolecular complex triggers rapid ATP-to-ITP conversion in response to phage infection.
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DOI:
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DOI:
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