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| Title | Structural basis and functional roles for Toll-like receptor binding to Latrophilin in C. elegans development. |
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| Journal, issue, pages | Nat Struct Mol Biol, Vol. 32, Issue 9, Page 1683-1696, Year 2025 |
| Publish date | Jun 30, 2025 |
Authors | Gabriel Carmona-Rosas / Jingxian Li / Jayson J Smith / Wioletta I Nawrocka / Shouqiang Cheng / Elana E Baltrusaitis / Minglei Zhao / Demet Araç / Paschalis Kratsios / Engin Özkan / ![]() |
| PubMed Abstract | Latrophilins are conserved adhesion-type G-protein-coupled receptors associated with embryonic defects and lethality. However, their mechanistic roles and ligands in embryogenesis remain unknown. ...Latrophilins are conserved adhesion-type G-protein-coupled receptors associated with embryonic defects and lethality. However, their mechanistic roles and ligands in embryogenesis remain unknown. Here, we identified TOL-1, the sole Toll-like receptor in Caenorhabditis elegans, as a ligand for the C. elegans latrophilin, LAT-1. The extracellular lectin domain of LAT-1 directly binds to the second leucine-rich repeat domain of TOL-1. The crystal structure and cryo-electron microscopy density map of the LAT-1-TOL-1 extracellular region complex reveal a one-to-one lectin domain interaction with the convex face of a leucine-rich repeat domain. In C. elegans, endogenous mRNA and protein localization analyses showed mutually exclusive sites of expression, suggesting that in vivo LAT-1-TOL-1 interactions mostly occur in trans. Mutagenesis of key interface residues that disrupt the LAT-1-TOL-1 interaction led to partial lethality and malformed embryos. Thus, TOL-1 binding to LAT-1 represents a receptor-ligand axis essential for animal development. |
External links | Nat Struct Mol Biol / PubMed:40588662 |
| Methods | EM (single particle) / X-ray diffraction |
| Resolution | 4 - 6.3 Å |
| Structure data | ![]() EMDB-40786: Structural basis and functional roles for Toll-like receptor binding to Latrophilin adhesion-GPCR in embryo development ![]() PDB-8suf: |
| Chemicals | ![]() ChemComp-NAG: |
| Source |
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Keywords | CELL ADHESION / Cell Surface Receptor |
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