ジャーナル: Elife / 年: 2023 タイトル: Cryo-EM reveals an unprecedented binding site for Na1.7 inhibitors enabling rational design of potent hybrid inhibitors. 著者: Marc Kschonsak / Christine C Jao / Christopher P Arthur / Alexis L Rohou / Philippe Bergeron / Daniel F Ortwine / Steven J McKerrall / David H Hackos / Lunbin Deng / Jun Chen / Tianbo Li / ...著者: Marc Kschonsak / Christine C Jao / Christopher P Arthur / Alexis L Rohou / Philippe Bergeron / Daniel F Ortwine / Steven J McKerrall / David H Hackos / Lunbin Deng / Jun Chen / Tianbo Li / Peter S Dragovich / Matthew Volgraf / Matthew R Wright / Jian Payandeh / Claudio Ciferri / John C Tellis / 要旨: The voltage-gated sodium (Na) channel Na1.7 has been identified as a potential novel analgesic target due to its involvement in human pain syndromes. However, clinically available Na channel-blocking ...The voltage-gated sodium (Na) channel Na1.7 has been identified as a potential novel analgesic target due to its involvement in human pain syndromes. However, clinically available Na channel-blocking drugs are not selective among the nine Na channel subtypes, Na1.1-Na1.9. Moreover, the two currently known classes of Na1.7 subtype-selective inhibitors (aryl- and acylsulfonamides) have undesirable characteristics that may limit their development. To this point understanding of the structure-activity relationships of the acylsulfonamide class of Na1.7 inhibitors, exemplified by the clinical development candidate , has been based solely on a single co-crystal structure of an arylsulfonamide inhibitor bound to voltage-sensing domain 4 (VSD4). To advance inhibitor design targeting the Na1.7 channel, we pursued high-resolution ligand-bound Na1.7-VSD4 structures using cryogenic electron microscopy (cryo-EM). Here, we report that engages the Na1.7-VSD4 through an unexpected binding mode orthogonal to the arylsulfonamide inhibitor class binding pose, which identifies a previously unknown ligand binding site in Na channels. This finding enabled the design of a novel hybrid inhibitor series that bridges the aryl- and acylsulfonamide binding pockets and allows for the generation of molecules with substantially differentiated structures and properties. Overall, our study highlights the power of cryo-EM methods to pursue challenging drug targets using iterative and high-resolution structure-guided inhibitor design. This work also underscores an important role of the membrane bilayer in the optimization of selective Na channel modulators targeting VSD4.
超分子 #1: VSD4-NaV1.7-NaVPas channel chimera bound to the hybrid inhibitor ...
超分子
名称: VSD4-NaV1.7-NaVPas channel chimera bound to the hybrid inhibitor GNE-9296 タイプ: complex / ID: 1 / キメラ: Yes / 親要素: 0 / 含まれる分子: #1-#2 詳細: Chimeric construct of human Nav1.7 VSD4 and the NavPaS channel from American cockroach Periplaneta americana
由来(天然)
生物種: Homo sapiens (ヒト)
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分子 #1: Sodium channel protein PaFPC1,Sodium channel protein type 9 subun...
分子
名称: Sodium channel protein PaFPC1,Sodium channel protein type 9 subunit alpha chimera タイプ: protein_or_peptide / ID: 1 / コピー数: 1 / 光学異性体: LEVO