National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R03 AI135767
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R01 GM098621
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R01 GM116942
米国
引用
ジャーナル: Cell Rep / 年: 2021 タイトル: The structural basis of Salmonella AB toxin neutralization by antibodies targeting the glycan-receptor binding subunits. 著者: Tri Nguyen / Angelene F Richards / Durga P Neupane / J Ryan Feathers / Yi-An Yang / Ji Hyun Sim / Haewon Byun / Sohyoung Lee / Changhwan Ahn / Greta Van Slyke / J Christopher Fromme / ...著者: Tri Nguyen / Angelene F Richards / Durga P Neupane / J Ryan Feathers / Yi-An Yang / Ji Hyun Sim / Haewon Byun / Sohyoung Lee / Changhwan Ahn / Greta Van Slyke / J Christopher Fromme / Nicholas J Mantis / Jeongmin Song / 要旨: Many bacterial pathogens secrete AB toxins comprising two functionally distinct yet complementary "A" and "B" subunits to benefit the pathogens during infection. The lectin-like pentameric B subunits ...Many bacterial pathogens secrete AB toxins comprising two functionally distinct yet complementary "A" and "B" subunits to benefit the pathogens during infection. The lectin-like pentameric B subunits recognize specific sets of host glycans to deliver the toxin into target host cells. Here, we offer the molecular mechanism by which neutralizing antibodies, which have the potential to bind to all glycan-receptor binding sites and thus completely inhibit toxin binding to host cells, are inhibited from exerting this action. Cryogenic electron microscopy (cryo-EM)-based analyses indicate that the skewed positioning of the toxin A subunit(s) toward one side of the toxin B pentamer inhibited neutralizing antibody binding to the laterally located epitopes, rendering some glycan-receptor binding sites that remained available for the toxin binding and endocytosis process, which is strikingly different from the counterpart antibodies recognizing the far side-located epitopes. These results highlight additional features of the toxin-antibody interactions and offer important insights into anti-toxin strategies.
名称: Complex of TyTx1 Fab with Typhoid toxin / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: Fab fragment generated by proteolytic cleavage of IgG antibody in complex with purified Typhoid toxin
Initial local fitting was done using Chimera and then Coot was used for rebuilding Fab variable domains into correct sequences. Refinement was performed using Real Space Refine in PHENIX and was iterated with manual building in Coot.
得られたモデル
PDB-7k7h: Density-fitted Model Structure of Antibody Variable Domains of TyTx1 in Complex with PltB pentamer of Typhoid Toxin