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-Structure paper
タイトル | Cryo-EM structures reveal two allosteric inhibition modes of PI3Kα involving a re-shaping of the activation loop. |
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ジャーナル・号・ページ | Structure, Vol. 32, Issue 7, Page 907-917.e7, Year 2024 |
掲載日 | 2024年7月11日 |
著者 | Xiuliang Huang / Kailiang Wang / Jing Han / Xiumei Chen / Zhenglin Wang / Tianlun Wu / Bo Yu / Feng Zhao / Xinjuan Wang / Huijuan Li / Zhi Xie / Xiaotian Zhu / Wenge Zhong / Xiaoming Ren / |
PubMed 要旨 | PI3Kα is a lipid kinase that phosphorylates PIP2 and generates PIP3. The hyperactive PI3Kα mutation, H1047R, accounts for about 14% of breast cancer, making it a highly attractive target for drug ...PI3Kα is a lipid kinase that phosphorylates PIP2 and generates PIP3. The hyperactive PI3Kα mutation, H1047R, accounts for about 14% of breast cancer, making it a highly attractive target for drug discovery. Here, we report the cryo-EM structures of PI3Kα bound to two different allosteric inhibitors QR-7909 and QR-8557 at a global resolution of 2.7 Å and 3.0 Å, respectively. The structures reveal two distinct binding pockets on the opposite sides of the activation loop. Structural and MD simulation analyses show that the allosteric binding of QR-7909 and QR-8557 inhibit PI3Kα hyper-activity by reducing the fluctuation and mobility of the activation loop. Our work provides a strong rational basis for a further optimization and development of highly selective drug candidates to treat PI3Kα-driven cancers. |
リンク | Structure / PubMed:38582077 |
手法 | EM (単粒子) |
解像度 | 2.7 - 3.0 Å |
構造データ | EMDB-37362, PDB-8w9a: EMDB-37363, PDB-8w9b: |
化合物 |
ChemComp-UEX: ChemComp-HOH:
ChemComp-UJ3: |
由来 |
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キーワード | ONCOPROTEIN / PI3K-alpha / lipid kinase / allosteric inhibition |