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Conservation of Protein Domains Over Different Proteins

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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Related Experiment Video

Updated: Feb 21, 2026

Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study
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Robo Ig4 Is a Dimerization Domain.

Galit Yom-Tov1, Reut Barak1, Omri Matalon1

  • 1The Mina & Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel.

Journal of Molecular Biology
|October 12, 2017
PubMed
Summary

Robo receptors are key in cell guidance and disease. This study identifies the Ig4 domain as crucial for Robo receptor dimerization, linking this interaction to cellular signaling and potential drug development.

Keywords:
Ig-domainSlit–RoboX-ray crystallographydimerizationreceptor

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Structural Biology

Background:

  • Robo receptors are critical for axonal guidance, neurogenesis, angiogenesis, cell migration, and cancer progression.
  • They represent promising drug targets for various diseases, including cancer and ocular neovascular disorders.
  • The precise mechanisms governing Robo receptor activation, particularly the transition between 'off' and 'on' states, remain largely unknown.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying Robo receptor activation.
  • To identify the specific domains responsible for Robo receptor dimerization.
  • To investigate the structural basis and functional consequences of Robo receptor dimerization.

Main Methods:

  • Crystallography was used to determine the structure of the tandem Ig4-5 domains of human Robo2.
  • Analytical ultracentrifugation was employed to assess the specificity and affinity of D4-mediated dimerization in solution.
  • Fluorescence resonance energy transfer (FRET) and cell-based assays (COS-7 cell collapse) were utilized to confirm dimerization in cells and link it to intracellular signaling.

Main Results:

  • The extracellular Ig4 (D4) domain was identified as the primary mediator of Robo receptor homotypic dimerization.
  • The crystal structure revealed a hydrophobic surface on D4 involved in reciprocal homotypic contacts.
  • Dimerization through the D4 interface was confirmed to be specific, with a dissociation constant of 16.9μM, and functionally linked to Robo signaling in cellular assays.

Conclusions:

  • The Ig4 domain is a key mediator of Robo receptor dimerization, essential for initiating intracellular signaling.
  • D4-mediated dimerization represents a conserved mechanism across Robo orthologs and paralogs, highlighting its central role in Robo activation.
  • Understanding D4-mediated dimerization provides critical insights for developing targeted therapies for diseases involving Robo signaling.