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-Structure paper
| タイトル | Shared ligand-blocking mechanism but distinct conformational modulation by α5-targeting antibodies BIIG2 and MINT1526A. |
|---|---|
| ジャーナル・号・ページ | bioRxiv, Year 2025 |
| 掲載日 | 2025年7月16日 |
著者 | Adam Nguyen / Joel B Heim / Gabriele Cordara / Matthew C Chan / Hedda Johannesen / Cristine Charlesworth / Ming Li / Caleigh M Azumaya / Benjamin Madden / Ute Krengel / Alexander Meves / Melody G Campbell / ![]() |
| PubMed 要旨 | Integrins are heterodimeric receptors important for cell adhesion and signaling. Integrin α5β1 is a key mediator of angiogenesis and its dysregulation is associated with tumor progression and ...Integrins are heterodimeric receptors important for cell adhesion and signaling. Integrin α5β1 is a key mediator of angiogenesis and its dysregulation is associated with tumor progression and metastasis. Despite numerous efforts, α5β1-targeting therapeutics have been unsuccessful due to poor efficacy and off-target effects. A contributing factor is our limited understanding of how integrin conformation influences interactions with therapeutics. Using cell-based functional assays, patient derived xenografts, biophysics, and electron microscopy, we shed light on these relationships by characterizing two anti-α5β1 antibodies, BIIG2 and MINT1526A. We show that both antibodies bind α5β1 with nanomolar affinity, reduce angiogenesis , and bind overlapping epitopes that block fibronectin binding. However, using cryoEM, we reveal that while BIIG2 binding doesn't alter the conformational states, MINT1526A restricts α5β1's range of flexibility. These insights can guide which aspects to prioritize and improve the design of future integrin-targeted therapeutics. |
リンク | bioRxiv / PubMed:39829743 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 1.38 - 2.7 Å |
| 構造データ | EMDB-44386, PDB-9b9j: EMDB-44387, PDB-9b9k: ![]() PDB-8r38: |
| 化合物 | ![]() ChemComp-GOL: ![]() ChemComp-CL: ![]() ChemComp-HOH: ![]() ChemComp-CA: ![]() ChemComp-NAG: |
| 由来 |
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キーワード | IMMUNE SYSTEM / BIIG2 Fab / anti-integrin / glycosylated / SIGNALING PROTEIN / CELL ADHESION / Integrin / Antibody Fab / Inhibitory |
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