- EMDB-23917: The HER2 S310F/HER3/NRG1b Heterodimer -
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基本情報
登録情報
データベース: EMDB / ID: EMD-23917
タイトル
The HER2 S310F/HER3/NRG1b Heterodimer
マップデータ
Final HER2S310F/HER3/NRG1b ectodomain reconstruction at 3.1A resolution based on 0.143FSC metric. Filtered with the FSC and sharpened with b-factor of -90.
試料
複合体: NRB1b-bound HER2-S310F/HER3 Heterodimer in the context of near full-length receptors
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM139635
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
1F30CA247147
米国
German Research Foundation (DFG)
TR 1668/1-1
ドイツ
引用
ジャーナル: Nature / 年: 2021 タイトル: Structures of the HER2-HER3-NRG1β complex reveal a dynamic dimer interface. 著者: Devan Diwanji / Raphael Trenker / Tarjani M Thaker / Feng Wang / David A Agard / Kliment A Verba / Natalia Jura / 要旨: Human epidermal growth factor receptor 2 (HER2) and HER3 form a potent pro-oncogenic heterocomplex upon binding of growth factor neuregulin-1β (NRG1β). The mechanism by which HER2 and HER3 interact ...Human epidermal growth factor receptor 2 (HER2) and HER3 form a potent pro-oncogenic heterocomplex upon binding of growth factor neuregulin-1β (NRG1β). The mechanism by which HER2 and HER3 interact remains unknown in the absence of any structures of the complex. Here we isolated the NRG1β-bound near full-length HER2-HER3 dimer and, using cryo-electron microscopy, reconstructed the extracellulardomain module, revealing unexpected dynamics at the HER2-HER3 dimerization interface. We show that the dimerization arm of NRG1β-bound HER3 is unresolved because the apo HER2 monomer does not undergo a ligand-induced conformational change needed to establish a HER3 dimerization arm-binding pocket. In a structure of the oncogenic extracellular domain mutant HER2(S310F), we observe a compensatory interaction with the HER3 dimerization arm that stabilizes the dimerization interface. Both HER2-HER3 and HER2(S310F)-HER3 retain the capacity to bind to the HER2-directed therapeutic antibody trastuzumab, but the mutant complex does not bind to pertuzumab. Our structure of the HER2(S310F)-HER3-NRG1β-trastuzumab Fab complex reveals that the receptor dimer undergoes a conformational change to accommodate trastuzumab. Thus, similar to oncogenic mutations, therapeutic agents exploit the intrinsic dynamics of the HER2-HER3 heterodimer. The unique features of a singly liganded HER2-HER3 heterodimer underscore the allosteric sensing of ligand occupancy by the dimerization interface and explain why extracellular domains of HER2 do not homo-associate via a canonical active dimer interface.
ダウンロード / ファイル: emd_23917.map.gz / 形式: CCP4 / 大きさ: 244.1 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Final HER2S310F/HER3/NRG1b ectodomain reconstruction at 3.1A resolution based on 0.143FSC metric. Filtered with the FSC and sharpened with b-factor of -90.