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-Structure paper
| タイトル | Structural insights into type-I and type-II Lamassu antiphage systems. |
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| ジャーナル・号・ページ | Nat Chem Biol, Year 2026 |
| 掲載日 | 2026年1月2日 |
著者 | Ming Li / Xiaolong Zhao / Xingyu Zhao / Dong Li / Weijia Xiong / Zirui Gao / Ling Huang / Linfeng An / Yongxiang Gao / Shanshan Li / Yue Feng / Kaiming Zhang / Yi Zhang / ![]() |
| PubMed 要旨 | Bacteria have developed a variety of immune systems to combat phage infections. The Lamassu system is a prokaryotic immune system with a core conserved structural maintenance of chromosomes (SMC) ...Bacteria have developed a variety of immune systems to combat phage infections. The Lamassu system is a prokaryotic immune system with a core conserved structural maintenance of chromosomes (SMC) superfamily protein LmuB and diverse effectors named LmuA, whose mechanism remains unclear. Here we present a series of cryo-electron microscopy structures of the type-I Lamassu complex from Bacillus cellulasensis and the type-II Lamassu complex from Vibrio cholerae, both in apo and dsDNA-bound states, revealing an unexpected stoichiometry and topological architecture distinct from canonical SMC complexes. Combined structural and biochemical analyses show how the nuclease effector LmuA is sequestered in an inactive monomeric form within the Lamassu complex and, upon sensing foreign DNA ends, dissociates and assembles into an active tetramer capable of DNA cleavage. Our findings elucidate the mechanism by which Lamassu systems detect viral replication and implement antiphage defense, highlighting the roles of SMC proteins in prokaryotic immunity. |
リンク | Nat Chem Biol / PubMed:41482579 |
| 手法 | EM (単粒子) |
| 解像度 | 3.03 - 4.07 Å |
| 構造データ | EMDB-64575, PDB-9ux7: EMDB-64576, PDB-9ux8: EMDB-64583, PDB-9uxh: EMDB-64584, PDB-9uxi: EMDB-64585, PDB-9uxk: EMDB-64586, PDB-9uxl: |
| 由来 |
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キーワード | IMMUNE SYSTEM / complex / anti-phage system / DNA BINDING PROTEIN / endonuclease; Structural maintenance of chromosomes (SMC) proteins; DNA BINDING PROTEIN |
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