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-Structure paper
| タイトル | A surface lipoprotein on Pasteurella multocida binds complement factor I to promote immune evasion. |
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| ジャーナル・号・ページ | PLoS Pathog, Vol. 21, Issue 5, Page e1012686, Year 2025 |
| 掲載日 | 2025年5月6日 |
著者 | Quynh Huong Nguyen / Chun Heng Royce Lai / Michael J Norris / Dixon Ng / Megha Shah / Christine Chieh-Lin Lai / David E Isenman / Trevor F Moraes / ![]() |
| PubMed 要旨 | Pasteurella multocida is the leading cause of wound infections in humans following animals' bites or scratches. This bacterium is also commonly found in the respiratory tract of many mammals and can ...Pasteurella multocida is the leading cause of wound infections in humans following animals' bites or scratches. This bacterium is also commonly found in the respiratory tract of many mammals and can cause serious diseases resulting in the rapid death of infected animals, especially cattle. To prevent these infections in cattle, a subunit-based vaccine utilizing the surface lipoprotein PmSLP was developed and showed remarkable protection with a single dose administration. Here, we report that PmSLP binds host complement factor I (FI) and facilitates cleavage of complement components C3b and C4b independently of any cofactors (e.g., FH, C4BP), thereby allowing the pathogen to evade host defence. Cryo-EM structure of PmSLP bound to FI reveals that PmSLP stimulates FI enzymatic activity by stabilizing the catalytic domain. This is the first time that a bacterial protein has been shown to directly activate FI independent of complement cofactors and target all arms of the complement cascade. |
リンク | PLoS Pathog / PubMed:40327719 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 2 - 4.0 Å |
| 構造データ | EMDB-44139, PDB-9b3h: ![]() EMDB-44146: Conformation 1 of the assembled dimer of PmSLP-1:FI complex ![]() EMDB-44149: Conformation 2 of the assembled dimer of PmSLP-1:FI complex ![]() PDB-9b3e: |
| 化合物 | ![]() ChemComp-SE: ![]() ChemComp-HOH: ![]() ChemComp-NAG: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Bacterial surface lipoprotein / complement evasion / complement protein / immune evasion |
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pasteurella multocida 36950 (バクテリア)
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