National Institutes of Health/National Cancer Institute (NIH/NCI)
R35CA242461-06
米国
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Cryo-EM structures of CRAF/MEK1/14-3-3 complexes in autoinhibited and open-monomer states reveal features of RAF regulation. 著者: Dong Man Jang / Kayla Boxer / Byung Hak Ha / Emre Tkacik / Talya Levitz / Shaun Rawson / Rebecca J Metivier / Anna Schmoker / Hyesung Jeon / Michael J Eck / 要旨: CRAF (RAF1) is one of three RAF-family kinases that initiate MAP kinase signaling in response to activated RAS and is essential for oncogenic signaling from mutant KRAS. Like BRAF, CRAF is regulated ...CRAF (RAF1) is one of three RAF-family kinases that initiate MAP kinase signaling in response to activated RAS and is essential for oncogenic signaling from mutant KRAS. Like BRAF, CRAF is regulated by 14-3-3 engagement and by intramolecular autoinhibitory interactions of its N-terminal regulatory region. Unlike BRAF, it is thought to require tyrosine phosphorylation in its N-terminal acidic (NtA) motif for full catalytic activation. Here we describe cryo-EM reconstructions of full-length CRAF in complex with MEK1 and a 14-3-3 dimer. These structures reveal a fully autoinhibited conformation analogous to that observed for BRAF and two "open monomer" states in which the inhibitory interactions of the CRD and 14-3-3 dimer are released or rearranged, but the kinase domain remains inactive. Structure-function studies of the NtA motif indicate that phosphorylation or acidic mutations in this segment increase catalytic activity by destabilizing the inactive conformation of the kinase domain. Collectively, these studies provide a structural foundation for understanding the shared and unique regulatory features of CRAF and will inform efforts to selectively block CRAF signaling in cancer.
想定した対称性 - 点群: C1 (非対称) / 解像度のタイプ: BY AUTHOR / 解像度: 2.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 詳細: The final resolution was calculated without a mask / 使用した粒子像数: 168600
初期 角度割当
タイプ: OTHER / 詳細: Ab-initio reconstruction in CryoSPARC
最終 角度割当
タイプ: OTHER / 詳細: NU-refinement in CryoSPARC
FSC曲線 (解像度の算出)
-
原子モデル構築 1
精密化
空間: REAL
得られたモデル
PDB-9mmq: Cryo-EM structure of CRAF/MEK1 complex (kinase domain)