National Natural Science Foundation of China (NSFC)
32070048
China
Citation
Journal: Nat Commun / Year: 2024 Title: Structural basis of Frizzled 4 in recognition of Dishevelled 2 unveils mechanism of WNT signaling activation. Authors: Yu Qian / Zhengxiong Ma / Zhenmei Xu / Yaning Duan / Yangjie Xiong / Ruixue Xia / Xinyan Zhu / Zongwei Zhang / Xinyu Tian / Han Yin / Jian Liu / Jing Song / Yang Lu / Anqi Zhang / Changyou ...Authors: Yu Qian / Zhengxiong Ma / Zhenmei Xu / Yaning Duan / Yangjie Xiong / Ruixue Xia / Xinyan Zhu / Zongwei Zhang / Xinyu Tian / Han Yin / Jian Liu / Jing Song / Yang Lu / Anqi Zhang / Changyou Guo / Lihua Jin / Woo Jae Kim / Jiyuan Ke / Fei Xu / Zhiwei Huang / Yuanzheng He / Abstract: WNT signaling is fundamental in development and homeostasis, but how the Frizzled receptors (FZDs) propagate signaling remains enigmatic. Here, we present the cryo-EM structure of FZD4 engaged with ...WNT signaling is fundamental in development and homeostasis, but how the Frizzled receptors (FZDs) propagate signaling remains enigmatic. Here, we present the cryo-EM structure of FZD4 engaged with the DEP domain of Dishevelled 2 (DVL2), a key WNT transducer. We uncover a distinct binding mode where the DEP finger-loop inserts into the FZD4 cavity to form a hydrophobic interface. FZD4 intracellular loop 2 (ICL2) additionally anchors the complex through polar contacts. Mutagenesis validates the structural observations. The DEP interface is highly conserved in FZDs, indicating a universal mechanism by which FZDs engage with DVLs. We further reveal that DEP mimics G-protein/β-arrestin/GRK to recognize an active conformation of receptor, expanding current GPCR engagement models. Finally, we identify a distinct FZD4 dimerization interface. Our findings delineate the molecular determinants governing FZD/DVL assembly and propagation of WNT signaling, providing long-sought answers underlying WNT signal transduction.
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