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.
全体 : Dimeric complex of PmSLP-1 and complement factor I
全体
名称: Dimeric complex of PmSLP-1 and complement factor I
要素
複合体: Dimeric complex of PmSLP-1 and complement factor I
複合体: Monomeric complex of PmSLP-1 and complement factor I
複合体: Bovine complement factor I
タンパク質・ペプチド: Bovine complement factor I
複合体: Pasteurella multocida factor I binding protein, fIbp
タンパク質・ペプチド: Pasteurella multocida factor I binding protein, fIbp
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超分子 #1: Dimeric complex of PmSLP-1 and complement factor I
超分子
名称: Dimeric complex of PmSLP-1 and complement factor I / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: PmSLP-1 was recombinantly expressed and purified from E. coli. Complement factor I was purified from bovine serum. Purified PmSLP-1 and complement factor I were incubated together, and the ...詳細: PmSLP-1 was recombinantly expressed and purified from E. coli. Complement factor I was purified from bovine serum. Purified PmSLP-1 and complement factor I were incubated together, and the protein complex was isolated via gel filtration chromatography. The protein complex exists as a dimer (2 copies of PmSLP-1, and 2 copies of complement factor I)
分子量
理論値: 35 KDa
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超分子 #2: Monomeric complex of PmSLP-1 and complement factor I
超分子
名称: Monomeric complex of PmSLP-1 and complement factor I タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: all
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超分子 #3: Bovine complement factor I
超分子
名称: Bovine complement factor I / タイプ: complex / ID: 3 / 親要素: 2 / 含まれる分子: #1 / 詳細: Complement factor I purified from bovine serum
由来(天然)
生物種: Bos taurus (ウシ)
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超分子 #4: Pasteurella multocida factor I binding protein, fIbp
超分子
名称: Pasteurella multocida factor I binding protein, fIbp タイプ: complex / ID: 4 / 親要素: 2 / 含まれる分子: #2 詳細: fIbp is a surface lipoprotein from Pasteurella multocida. The protein was expressed and purified from E. coli
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. 光学異性体: LEVO