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-Structure paper
タイトル | The Therapeutic Antibody LM609 Selectively Inhibits Ligand Binding to Human αβ Integrin via Steric Hindrance. |
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ジャーナル・号・ページ | Structure, Vol. 25, Issue 11, Page 1732-11739.e5, Year 2017 |
掲載日 | 2017年11月7日 |
著者 | Andrew J Borst / Zachary M James / William N Zagotta / Mark Ginsberg / Felix A Rey / Frank DiMaio / Marija Backovic / David Veesler / |
PubMed 要旨 | The LM609 antibody specifically recognizes αβ integrin and inhibits angiogenesis, bone resorption, and viral infections in an arginine-glycine-aspartate-independent manner. LM609 entered phase II ...The LM609 antibody specifically recognizes αβ integrin and inhibits angiogenesis, bone resorption, and viral infections in an arginine-glycine-aspartate-independent manner. LM609 entered phase II clinical trials for the treatment of several cancers and was also used for αβ-targeted radioimmunotherapy. To elucidate the mechanisms of recognition and inhibition of αβ integrin, we solved the structure of the LM609 antigen-binding fragment by X-ray crystallography and determined its binding affinity for αβ. Using single-particle electron microscopy, we show that LM609 binds at the interface between the β-propeller domain of the α chain and the βI domain of the β chain, near the RGD-binding site, of all observed integrin conformational states. Integrating these data with fluorescence size-exclusion chromatography, we demonstrate that LM609 sterically hinders access of large ligands to the RGD-binding pocket, without obstructing it. This work provides a structural framework to expedite future efforts utilizing LM609 as a diagnostic or therapeutic tool. |
リンク | Structure / PubMed:29033288 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.26 - 35.0 Å |
構造データ | EMDB-7011, PDB-6avq: EMDB-7012, PDB-6avr: EMDB-7013, PDB-6avu: PDB-5opy: |
化合物 | ChemComp-HOH: |
由来 |
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キーワード | IMMUNE SYSTEM / Antigen-binding fragment / Fab / LM609 / SIGNALING PROTEIN / alpha-V beta-3 integrin / vitaxin / abegrin |