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-Structure paper
タイトル | Cryo-EM structure of a dimeric B-Raf:14-3-3 complex reveals asymmetry in the active sites of B-Raf kinases. |
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ジャーナル・号・ページ | Science, Vol. 366, Issue 6461, Page 109-115, Year 2019 |
掲載日 | 2019年10月4日 |
著者 | Yasushi Kondo / Jana Ognjenović / Saikat Banerjee / Deepti Karandur / Alan Merk / Kayla Kulhanek / Kathryn Wong / Jeroen P Roose / Sriram Subramaniam / John Kuriyan / |
PubMed 要旨 | Raf kinases are important cancer drug targets. Paradoxically, many B-Raf inhibitors induce the activation of Raf kinases. Cryo-electron microscopy structural analysis of a phosphorylated B-Raf kinase ...Raf kinases are important cancer drug targets. Paradoxically, many B-Raf inhibitors induce the activation of Raf kinases. Cryo-electron microscopy structural analysis of a phosphorylated B-Raf kinase domain dimer in complex with dimeric 14-3-3, at a resolution of ~3.9 angstroms, shows an asymmetric arrangement in which one kinase is in a canonical "active" conformation. The distal segment of the C-terminal tail of this kinase interacts with, and blocks, the active site of the cognate kinase in this asymmetric arrangement. Deletion of the C-terminal segment reduces Raf activity. The unexpected asymmetric quaternary architecture illustrates how the paradoxical activation of Raf by kinase inhibitors reflects an innate mechanism, with 14-3-3 facilitating inhibition of one kinase while maintaining activity of the other. Conformational modulation of these contacts may provide new opportunities for Raf inhibitor development. |
リンク | Science / PubMed:31604311 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.9 Å |
構造データ | EMDB-20708, PDB-6uan: |
由来 |
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キーワード | SIGNALING PROTEIN / Complex Kinase |