Identification of new FGF1 binding partners-Implications for its intracellular function.

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Fibroblast growth factor 1 (FGF1) traditionally signals via cell surface receptors.
• FGF1 can translocate into the cell's cytosol and nucleus, but its intracellular function is unclear.

Purpose of the Study:

• To identify novel intracellular binding partners of FGF1.
• To elucidate the intracellular functions of FGF1.

Main Methods:

• Yeast two-hybrid screening.
• Tandem Affinity Purification (TAP) coupled with mass spectrometry (MS).
• Co-precipitation assays using recombinant FGF1 and pull-down assays with SPR measurements for validation.

Main Results:

• Identified twenty novel intracellular proteins interacting with FGF1.
• Confirmed direct interactions for selected proteins.
• Found that approximately half of the identified proteins are involved in cell viability processes (apoptosis, proliferation, cell cycle regulation).

Conclusions:

• Intracellular FGF1 acts independently of receptor-mediated signaling.
• FGF1's intracellular role is to enhance cell survival under stress conditions.