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-Structure paper
Title | Structural insights into the assembly of the agrin/LRP4/MuSK signaling complex. |
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Journal, issue, pages | Proc Natl Acad Sci U S A, Vol. 120, Issue 23, Page e2300453120, Year 2023 |
Publish date | Jun 6, 2023 |
![]() | Tian Xie / Guangjun Xu / Yun Liu / Bradley Quade / Weichun Lin / Xiao-Chen Bai / ![]() |
PubMed Abstract | MuSK is a receptor tyrosine kinase (RTK) that plays essential roles in the formation and maintenance of the neuromuscular junction. Distinct from most members of RTK family, MuSK activation requires ...MuSK is a receptor tyrosine kinase (RTK) that plays essential roles in the formation and maintenance of the neuromuscular junction. Distinct from most members of RTK family, MuSK activation requires not only its cognate ligand agrin but also its coreceptors LRP4. However, how agrin and LRP4 coactivate MuSK remains unclear. Here, we report the cryo-EM structure of the extracellular ternary complex of agrin/LRP4/MuSK in a stoichiometry of 1:1:1. This structure reveals that arc-shaped LRP4 simultaneously recruits both agrin and MuSK to its central cavity, thereby promoting a direct interaction between agrin and MuSK. Our cryo-EM analyses therefore uncover the assembly mechanism of agrin/LRP4/MuSK signaling complex and reveal how MuSK receptor is activated by concurrent binding of agrin and LRP4. |
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Methods | EM (single particle) |
Resolution | 3.8 Å |
Structure data | EMDB-40241, PDB-8s9p: |
Source |
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![]() | SIGNALING PROTEIN / agrin / LRP4 / MuSK / NMJ / RTK |