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-Structure paper
| タイトル | The role of kinase domain dimerization in EGFR activation. |
|---|---|
| ジャーナル・号・ページ | Structure, Vol. 34, Issue 3, Page 426-440.e6, Year 2026 |
| 掲載日 | 2026年3月5日 |
著者 | Zaritza O Petrova / Long Han / Yuko Tsutsui / Joshua B Sheetz / Kumar D Ashtekar / Mark A Lemmon / ![]() |
| PubMed 要旨 | The epidermal growth factor receptor (EGFR) was among the first receptor tyrosine kinases (RTKs) shown to be activated by ligand-induced dimerization. Structural studies explain how ligand binding ...The epidermal growth factor receptor (EGFR) was among the first receptor tyrosine kinases (RTKs) shown to be activated by ligand-induced dimerization. Structural studies explain how ligand binding induces the dimerization of EGFR's extracellular region. Unlike other RTKs, EGFR's intracellular tyrosine kinase domain (TKD) is activated allosterically in an asymmetric dimer that is observed crystallographically, but not in cryo-EM studies of intact EGFR. Here, we show that this asymmetric TKD dimer forms only transiently - explaining its lack of definition by cryo-EM. By engineering an asymmetric TKD dimer and studying a TKD-duplicated lung cancer EGFR variant, we show that TKD dimerization increases kinase activity by several hundred-fold. We were also able to stabilize and visualize discrete asymmetric EGFR TKD dimers at high resolution using cryo-EM. Our findings argue that oncogenic mutations activate EGFR primarily by promoting TKD dimerization, and suggest that the transient nature of EGFR TKD dimers may allow biased EGFR signaling. |
リンク | Structure / PubMed:41421344 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.27 Å |
| 構造データ | EMDB-71423, PDB-9p9u: |
| 化合物 | ![]() ChemComp-6JS: |
| 由来 |
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キーワード | ONCOPROTEIN / Receptor tyrosine kinases / epidermal growth factor receptor / growth factor signaling / dimerization |
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