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Updated: May 10, 2026

A Protocol for the Production of KLRG1 Tetramer
Published on: January 12, 2010
Structural basis for R-spondin recognition by LGR4/5/6 receptors
Dongli Wang1, Binlu Huang, Senyan Zhang
1Ministry of Education Key Laboratory of Protein Science, Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, PR China.
Researchers elucidated how R-spondin proteins (RSPO1-RSPO4) bind to LGR4 receptors. This structural insight reveals the molecular mechanism for Wnt pathway activation, crucial for development and stem cell growth.
Area of Science:
- Structural Biology
- Molecular Biology
- Developmental Biology
Background:
- R-spondins (RSPO1-RSPO4) are secreted proteins that enhance Wnt signaling.
- Leucine-rich repeat-containing G-protein-coupled receptors 4, 5, and 6 (LGR4/5/6) are identified as RSPO receptors.
Purpose of the Study:
- To determine the complex structure of the LGR4 extracellular domain (ECD) bound to RSPO1.
- To elucidate the molecular mechanism of RSPO-LGR4 interaction and RSPO1's role in Wnt pathway activation.
Main Methods:
- X-ray crystallography to determine the structure of the LGR4-ECD/RSPO1 complex.
- Binding assays and cellular assays to identify critical RSPO1 residues involved in receptor interaction and biological activity.
Main Results:
- The LGR4-ECD adopts a horseshoe structure, binding RSPO1 via its concave surface.
- Both FU-CRD1 and FU-CRD2 domains of RSPO1 are essential for LGR4 interaction.
- Specific RSPO1 residues critical for biological activity were identified.
Conclusions:
- The study defines the molecular mechanism of RSPO recognition by LGR4/5/6 receptors.
- Structural insights into RSPO-LGR4 interactions provide a basis for understanding signaling differences within the LGR family.
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