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Mapping the FGF2 Interactome Identifies a Functional Proteoglycan Coreceptor.

Meg Critcher1,2, Jia Meng Pang1,2, Mia L Huang1,2

  • 1Department of Chemistry, Scripps Research, 10550 N Torrey Pines Rd, La Jolla, California 92037, United States.

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|December 20, 2024
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Summary
This summary is machine-generated.

This study maps the binding partners of Fibroblast Growth Factor 2 (FGF2) using proximity labeling. Researchers identified over 600 new FGF2 interactors, revealing the importance of GAG binding in FGF2 functions.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Fibroblast Growth Factor 2 (FGF2) is a key signaling protein with diverse cellular functions.
  • FGF2 signaling relies on interactions with receptors and proteoglycans, which are modified by glycosaminoglycans (GAGs).
  • The complete set of FGF2 binding partners (interactome) and the specific proteoglycans involved are not fully understood.

Purpose of the Study:

  • To comprehensively map the FGF2 interactome using a novel proximity labeling approach.
  • To identify new FGF2 binding partners across different cell types.
  • To investigate the role of GAG binding in modulating FGF2 interactions.

Main Methods:

  • Engineered an APEX2-FGF2 fusion protein for peroxidase-catalyzed live cell proximity labeling.
  • Applied the labeling technique to two cell lines with distinct FGF2-driven functions.
  • Analyzed labeled proteins to identify FGF2 interactors.

Main Results:

  • Greatly expanded the known FGF2 interactome, identifying over 600 new putative interactors.
  • Demonstrated that FGF2's capacity to bind GAGs significantly influences its interactome.
  • Revealed cell type-specific differences in FGF2 binding partners.

Conclusions:

  • The study provides a significantly expanded map of the FGF2 interactome.
  • GAG binding is a critical factor in determining FGF2's cellular interactions and functions.
  • This work offers new insights into the complex signaling network of FGF2.