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-Structure paper
| タイトル | Architecture remodeling activates the HerA-DUF anti-phage defense system. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 85, Issue 6, Page 1189-11201.e5, Year 2025 |
| 掲載日 | 2025年3月20日 |
著者 | Anthony D Rish / Elizabeth Fosuah / Zhangfei Shen / Ila A Marathe / Vicki H Wysocki / Tian-Min Fu / ![]() |
| PubMed 要旨 | Leveraging AlphaFold models and integrated experiments, we characterized the HerA-DUF4297 (DUF) anti-phage defense system, focusing on DUF's undefined biochemical functions. Guided by structure-based ...Leveraging AlphaFold models and integrated experiments, we characterized the HerA-DUF4297 (DUF) anti-phage defense system, focusing on DUF's undefined biochemical functions. Guided by structure-based genomic analyses, we found DUF homologs to be universally distributed across diverse bacterial immune systems. Notably, one such homolog, Cap4, is a nuclease. Inspired by this evolutionary clue, we tested DUF's nuclease activity and observed that DUF cleaves DNA substrates only when bound to its partner protein HerA. To dissect the mechanism of DUF activation, we determined the structures of DUF and HerA-DUF. Although DUF forms large oligomeric assemblies both alone and with HerA, oligomerization alone was insufficient to elicit nuclease activity. Instead, HerA binding induces a profound architecture remodeling that propagates throughout the complex. This remodeling reconfigures DUF into an active nuclease capable of robust DNA cleavage. Together, we highlight an architecture remodeling-driven mechanism that may inform the activation of other immune systems. |
リンク | Mol Cell / PubMed:40010344 |
| 手法 | EM (単粒子) |
| 解像度 | 2.76 - 3.38 Å |
| 構造データ | EMDB-45124, PDB-9c1m: EMDB-45125, PDB-9c1n: EMDB-45126, PDB-9c1o: EMDB-45132, PDB-9c1x: EMDB-45234, PDB-9c5x: |
| 由来 |
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キーワード | ANTIVIRAL PROTEIN / anti-phage / nuclease / ATPase / 18-mer / Complex / topoisomerase / 12-mer / Oligomerization domain |
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