Related Experiment Videos
Identification of binding domains for basic fibroblast growth factor in proteoglycan macrophage colony-stimulating
S Suzu1, F Kimura, H Matsumoto
1Biochemical Research Laboratory, Morinaga Milk Industry Co., Ltd., Kanagawa, Japan.
Abstract:
We recently demonstrated that proteoglycan macrophage colony-stimulating factor (PG-M-CSF) binds basic fibroblast growth factor (bFGF) and neutralizes the biological activity of bFGF. In this study, we identified the binding sites of PG-M-CSF for bFGF. We examined the binding of bFGF to overlapping 12-mer peptides with the sequence of the putative binding region. High affinity binding was detected at two peaks; one consisted of the three adjacent peptides, 212-223, 213-224 and 214-225 and the other, of the three adjacent peptides, 246-257, 247-258 and 248-259. The synthetic peptide (212VDPGSAKQRPPRST225) did not inhibit bFGF binding to another peptide (246PQPRPSVGAFNPGM259), and vice versa. However, both peptides inhibited the bFGF-induced but not platelet-derived growth factor-induced stimulation of DNA synthesis in murine Balb/c 3T3 cells.
Insights
Proteoglycan macrophage colony-stimulating factor (PG-M-CSF) binds basic fibroblast growth factor (bFGF) at two distinct sites. These PG-M-CSF binding sites neutralize bFGF
Area of Science:
- Molecular Biology
- Cell Signaling
- Protein Interactions
Background:
- Proteoglycan macrophage colony-stimulating factor (PG-M-CSF) is known to bind basic fibroblast growth factor (bFGF).
- PG-M-CSF neutralizes the biological activity of bFGF, suggesting specific interaction sites.
Purpose of the Study:
- To identify the precise binding sites of PG-M-CSF for bFGF.
- To characterize the functional significance of these binding interactions.
Main Methods:
- Examination of bFGF binding to overlapping 12-mer peptides representing the putative binding region of PG-M-CSF.
- Assessment of synthetic peptide inhibition of bFGF binding to other peptides.
- Evaluation of peptide effects on bFGF-induced and platelet-derived growth factor-induced DNA synthesis in Balb/c 3T3 cells.
Main Results:
- High-affinity binding of bFGF to PG-M-CSF was detected at two distinct peptide regions: peptides 212-225 and 246-259.
- Individual synthetic peptides from these regions did not inhibit each other's binding to bFGF.
- Both identified peptides inhibited bFGF-induced, but not platelet-derived growth factor-induced, DNA synthesis.
Conclusions:
- PG-M-CSF interacts with bFGF at two specific regions, mediating its biological activity.
- These findings elucidate the molecular mechanism of PG-M-CSF's bFGF neutralization.
- The identified peptides represent potential therapeutic targets for modulating bFGF signaling.