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-Structure paper
| タイトル | DdmDE eliminates plasmid invasion by DNA-guided DNA targeting. |
|---|---|
| ジャーナル・号・ページ | Cell, Vol. 187, Issue 19, Page 5253-5266.e16, Year 2024 |
| 掲載日 | 2024年9月19日 |
著者 | Xiao-Yuan Yang / Zhangfei Shen / Chen Wang / Kotaro Nakanishi / Tian-Min Fu / ![]() |
| PubMed 要旨 | Horizontal gene transfer is a key driver of bacterial evolution, but it also presents severe risks to bacteria by introducing invasive mobile genetic elements. To counter these threats, bacteria have ...Horizontal gene transfer is a key driver of bacterial evolution, but it also presents severe risks to bacteria by introducing invasive mobile genetic elements. To counter these threats, bacteria have developed various defense systems, including prokaryotic Argonautes (pAgos) and the DNA defense module DdmDE system. Through biochemical analysis, structural determination, and in vivo plasmid clearance assays, we elucidate the assembly and activation mechanisms of DdmDE, which eliminates small, multicopy plasmids. We demonstrate that DdmE, a pAgo-like protein, acts as a catalytically inactive, DNA-guided, DNA-targeting defense module. In the presence of guide DNA, DdmE targets plasmids and recruits a dimeric DdmD, which contains nuclease and helicase domains. Upon binding to DNA substrates, DdmD transitions from an autoinhibited dimer to an active monomer, which then translocates along and cleaves the plasmids. Together, our findings reveal the intricate mechanisms underlying DdmDE-mediated plasmid clearance, offering fundamental insights into bacterial defense systems against plasmid invasions. |
リンク | Cell / PubMed:39173632 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.07 - 3.56 Å |
| 構造データ | EMDB-44486, PDB-9bf1: EMDB-44490, PDB-9bf5: ![]() EMDB-44515: Constituent EM map for the consensus map of DdmDE complex EMDB-44516, PDB-9bgk: ![]() EMDB-44562: Cryo-EM density map of DdmDE(1:1) complex bound with DNA ![]() EMDB-44563: Cryo-EM map of DdmDE(1:1) complex bound with DNA EMDB-45254, PDB-9c6q: |
| 化合物 | ![]() ChemComp-MG: |
| 由来 |
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キーワード | IMMUNE SYSTEM / Vibrio cholerae / bacteria / anti-plasmids / defense system / DNA defense modules(Ddm) / DdmDE / IMMUNE SYSTEM/DNA / anti-plasmid / IMMUNE SYSTEM-DNA complex / DNA defense modules (Ddm) / bacterial immune system |
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