National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35 GM131747
米国
引用
ジャーナル: Elife / 年: 2020 タイトル: Limited dishevelled/Axin oligomerization determines efficiency of Wnt/β-catenin signal transduction. 著者: Wei Kan / Michael D Enos / Elgin Korkmazhan / Stefan Muennich / Dong-Hua Chen / Melissa V Gammons / Mansi Vasishtha / Mariann Bienz / Alexander R Dunn / Georgios Skiniotis / William I Weis / 要旨: In Wnt/β-catenin signaling, the transcriptional coactivator β-catenin is regulated by its phosphorylation in a complex that includes the scaffold protein Axin and associated kinases. Wnt binding to ...In Wnt/β-catenin signaling, the transcriptional coactivator β-catenin is regulated by its phosphorylation in a complex that includes the scaffold protein Axin and associated kinases. Wnt binding to its coreceptors activates the cytosolic effector Dishevelled (Dvl), leading to the recruitment of Axin and the inhibition of β-catenin phosphorylation. This process requires interaction of homologous DIX domains present in Dvl and Axin, but is mechanistically undefined. We show that Dvl DIX forms antiparallel, double-stranded oligomers in vitro, and that Dvl in cells forms oligomers typically <10 molecules at endogenous expression levels. Axin DIX (DAX) forms small single-stranded oligomers, but its self-association is stronger than that of DIX. DAX caps the ends of DIX oligomers, such that a DIX oligomer has at most four DAX binding sites. The relative affinities and stoichiometry of the DIX-DAX interaction provide a mechanism for efficient inhibition of β-catenin phosphorylation upon Axin recruitment to the Wnt receptor complex.
全体 : Segment polarity protein dishevelled homolog DVL-2
全体
名称: Segment polarity protein dishevelled homolog DVL-2
要素
複合体: Segment polarity protein dishevelled homolog DVL-2
タンパク質・ペプチド: Segment polarity protein dishevelled homolog DVL-2
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超分子 #1: Segment polarity protein dishevelled homolog DVL-2
超分子
名称: Segment polarity protein dishevelled homolog DVL-2 / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: Protein spontaneously formed a double-stranded, antiparallel helical filament upon removal of the MBP tag with TEV protease.
由来(天然)
生物種: Mus musculus (ハツカネズミ)
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分子 #1: Segment polarity protein dishevelled homolog DVL-2
モデルのタイプ: INSILICO MODEL In silico モデル: A starting model was generated using the stochastic gradient descent option from the "Initial model" jobtype in RELION 3.0.8.
最終 角度割当
タイプ: NOT APPLICABLE / ソフトウェア - 名称: RELION (ver. 3.0.8)
Chain - Chain ID: A / Chain - Residue range: 12-92 / Chain - Source name: PDB / Chain - Initial model type: experimental model
詳細
The two mutations in the source (Y27W and C80S) were reverted to Trp and Ser, respectively, before fitting. Model refinement was carried out through alternating rounds of real-space refinement in PHENIX and manual building in Coot.
精密化
空間: REAL / プロトコル: RIGID BODY FIT
得られたモデル
PDB-6vcc: Cryo-EM structure of the Dvl2 DIX filament