Natural Sciences and Engineering Research Council (NSERC, Canada)
RGPIN-2018-06546
カナダ
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
U24GM129547
米国
引用
ジャーナル: PLoS Pathog / 年: 2025 タイトル: A surface lipoprotein on Pasteurella multocida binds complement factor I to promote immune evasion. 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 / 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.
分子 #2: Pasteurella multocida factor I binding protein, fIbp
分子
名称: Pasteurella multocida factor I binding protein, fIbp タイプ: protein_or_peptide / ID: 2 詳細: Protein sequence includes a short linker, followed by a thrombin cleavage site and 10X His tag. The 10XHis tag was removed. コピー数: 1 / 光学異性体: LEVO