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-Structure paper
| タイトル | Structural basis for the inhibition of βFXIIa by garadacimab. |
|---|---|
| ジャーナル・号・ページ | Structure, Vol. 32, Issue 10, Page 1705-11710.e3, Year 2024 |
| 掲載日 | 2024年10月3日 |
著者 | Ieva Drulyte / Rajesh Ghai / Saw Yen Ow / Eugene A Kapp / Adam J Quek / Con Panousis / Michael J Wilson / Andrew D Nash / Matthias Pelzing / ![]() |
| PubMed 要旨 | Activated FXII (FXIIa) is the principal initiator of the plasma contact system and can activate both procoagulant and proinflammatory pathways. Its activity is important in the pathophysiology of ...Activated FXII (FXIIa) is the principal initiator of the plasma contact system and can activate both procoagulant and proinflammatory pathways. Its activity is important in the pathophysiology of hereditary angioedema (HAE). Here, we describe a high-resolution cryoelectron microscopy (cryo-EM) structure of the beta-chain from FXIIa (βFXIIa) complexed with the Fab fragment of garadacimab. Garadacimab binds to βFXIIa through an unusually long CDR-H3 that inserts into the S1 pocket in a non-canonical way. This structural mechanism is likely the primary contributor to the inhibition of activated FXIIa proteolytic activity in HAE. Garadacimab Fab-βFXIIa structure also reveals critical determinants of high-affinity binding of garadacimab to activated FXIIa. Structural analysis with other bona fide FXIIa inhibitors, such as benzamidine and C1-INH, reveals a surprisingly similar mechanism of βFXIIa inhibition by garadacimab. In summary, the garadacimab Fab-βFXIIa structure provides crucial insights into its mechanism of action and delineates primary and auxiliary paratopes/epitopes. |
リンク | Structure / PubMed:39059382 |
| 手法 | EM (単粒子) |
| 解像度 | 2.6 - 3.9 Å |
| 構造データ | EMDB-18999, PDB-8r8d: ![]() EMDB-19000: Cryo-EM structure of coagulation factor beta-XIIa in complex with the garadacimab Fab fragment (asymmetric dimer) ![]() EMDB-19001: Cryo-EM structure of coagulation factor beta-XIIa in complex with the garadacimab Fab fragment (monomer) |
| 化合物 | ![]() ChemComp-HOH: |
| 由来 |
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キーワード | BLOOD CLOTTING / Complex / coagulation / trypsin-like serine protease / hereditary angioedema (HAE) |
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