- EMDB-50929: Local refinement of the RNF213 RING domain and the IpaH2.5 LRR do... -
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データベース: EMDB / ID: EMD-50929
タイトル
Local refinement of the RNF213 RING domain and the IpaH2.5 LRR domain in the structure of human RNF213 bound to the secreted effector IpaH2.5 from Shigella flexneri
マップデータ
Focused refinement of the RNF213 RING domain and the IpaH2.5 LRR domain in the RNF213-IpaH2.5 complex (post-processed, auto-sharpened map)
試料
複合体: E3 ligase RNF213, bound to the secreted effector IpaH2.5 from Shigella flexneri
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Shigella flexneri evades LPS ubiquitylation through IpaH1.4-mediated degradation of RNF213. 著者: Katerina Naydenova / Keith B Boyle / Claudio Pathe / Prathyush Pothukuchi / Ana Crespillo-Casado / Felix Scharte / Pierre-Mehdi Hammoudi / Elsje G Otten / Neal M Alto / Felix Randow / 要旨: Pathogens have evolved diverse strategies to counteract host immunity. Ubiquitylation of lipopolysaccharide (LPS) on cytosol-invading bacteria by the E3 ligase RNF213 creates 'eat me' signals for ...Pathogens have evolved diverse strategies to counteract host immunity. Ubiquitylation of lipopolysaccharide (LPS) on cytosol-invading bacteria by the E3 ligase RNF213 creates 'eat me' signals for antibacterial autophagy, but whether and how cytosol-adapted bacteria avoid LPS ubiquitylation remains poorly understood. Here, we show that the enterobacterium Shigella flexneri actively antagonizes LPS ubiquitylation through IpaH1.4, a secreted effector protein with ubiquitin E3 ligase activity. IpaH1.4 binds to RNF213, ubiquitylates it and targets it for proteasomal degradation, thus counteracting host-protective LPS ubiquitylation. To understand how IpaH1.4 recognizes RNF213, we determined the cryogenic electron microscopy structure of the IpaH1.4-RNF213 complex. The specificity of the interaction is achieved through the leucine-rich repeat of IpaH1.4, which binds the RING domain of RNF213 by hijacking the conserved RING interface required for binding to ubiquitin-charged E2 enzymes. IpaH1.4 also targets other E3 ligases involved in inflammation and immunity through binding to the E2-interacting face of their RING domains, including the E3 ligase LUBAC that is required for the synthesis of M1-linked ubiquitin chains on cytosol-invading bacteria downstream of RNF213. We conclude that IpaH1.4 has evolved to antagonize multiple antibacterial and proinflammatory host E3 ligases.