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-Structure paper
| タイトル | Antibodies disrupt bacterial adhesion by ligand mimicry and allosteric interference. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 10590, Year 2025 |
| 掲載日 | 2025年11月26日 |
著者 | Kelli L Hvorecny / Gianluca Interlandi / Tim S Veth / Pavel Aprikian / Anna Manchenko / Veronika L Tchesnokova / Miles S Dickinson / Joel D Quispe / Nicholas M Riley / Rachel E Klevit / Pearl Magala / Evgeni V Sokurenko / Justin M Kollman / ![]() |
| PubMed 要旨 | A critical step in infections is the attachment of microorganisms to host cells using lectins that bind glycans, making lectins promising antimicrobial targets. Upon binding mannosylated glycans, ...A critical step in infections is the attachment of microorganisms to host cells using lectins that bind glycans, making lectins promising antimicrobial targets. Upon binding mannosylated glycans, FimH, an adhesin in E. coli, undergoes an allosteric transition from an inactive to an active conformation that can act as a catch-bond. Distinct monoclonal antibodies that alter FimH glycan binding are available, but the mechanisms of action remain unclear. Here, we use cryo-electron microscopy, mass spectrometry, adhesion assays, and molecular dynamics simulations to determine the structure-function relationships underlying antibody-FimH binding. Our study demonstrates four mechanisms of action: ligand mimicry by an N-linked, high-mannose glycan; stabilization of the ligand pocket in the inactive state; conformational trapping of the active and inactive states; and locking of the ligand pocket through long-range allosteric effects. These structures reveal multiple mechanisms of antibody responses to an allosteric protein and provide blueprints for antimicrobials that target adhesins. |
リンク | Nat Commun / PubMed:41298446 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.1 - 5.8 Å |
| 構造データ | EMDB-48183, PDB-9me4: EMDB-48184, PDB-9me5: EMDB-48185, PDB-9me6: EMDB-48186, PDB-9me7: ![]() EMDB-48187: Antibody fragments from mAb21 and mAb475 bound to the fimbrial tip protein, FimH EMDB-71842, PDB-9ptm: |
| 化合物 | ![]() ChemComp-MMA: |
| 由来 |
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キーワード | CELL ADHESION/IMMUNE SYSTEM / Fimbrial tip / Lectin domain / Antibody fragments / Antibody-target complex / CELL ADHESION / CELL ADHESION-IMMUNE SYSTEM complex |
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