- EMDB-50926: Local refinement of the RNF213 C-terminal and hinge domains in th... -
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データベース: EMDB / ID: EMD-50926
タイトル
Local refinement of the RNF213 C-terminal and hinge domains 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 C-terminal and hinge domains 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.