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Identification of a fibroblast growth factor-binding protein in Drosophila melanogaster
J S Doctor1, F M Hoffmann, B B Olwin
1McArdle Laboratory for Cancer Research, Department of Oncology, University of Wisconsin, Madison 53706.
Abstract:
As assessed by competitive binding and protein-crosslinking experiments, Drosophila melanogaster cells possess basic fibroblast growth factor (bFGF)-specific binding proteins that are similar to FGF receptors on vertebrate cells in molecular weight and binding affinity; these D. melanogaster cells, however, have no detectable binding proteins for acidic fibroblast growth factor (aFGF). Consistent with the presence of bFGF-specific binding proteins, D. melanogaster cells degrade bFGF but not aFGF. These results indicate the conservation of heparin-binding growth factors and receptors between vertebrates and D. melanogaster.
Insights
Fruit fly cells have specific binding proteins for basic fibroblast growth factor (bFGF), similar to vertebrate FGF receptors. This suggests conserved growth factor signaling pathways between flies and vertebrates.
Area of Science:
- Developmental Biology
- Molecular Biology
- Comparative Genomics
Background:
- Fibroblast growth factors (FGFs) are crucial signaling molecules in vertebrate development and physiology.
- FGF receptors (FGFRs) mediate FGF signaling, playing vital roles in cell growth, differentiation, and survival.
- The evolutionary conservation of signaling pathways is key to understanding fundamental biological processes.
Purpose of the Study:
- To investigate the presence and characteristics of fibroblast growth factor (FGF) binding proteins in Drosophila melanogaster.
- To compare FGF binding proteins in flies with known FGF receptors in vertebrate systems.
- To determine if Drosophila melanogaster cells can bind and degrade basic fibroblast growth factor (bFGF) and acidic fibroblast growth factor (aFGF).
Main Methods:
- Competitive binding assays were employed to assess the specificity of FGF binding proteins.
- Protein-crosslinking experiments were utilized to identify and characterize binding interactions.
- Degradation assays were performed to evaluate the cellular processing of bFGF and aFGF.
Main Results:
- Drosophila melanogaster cells possess specific binding proteins for basic fibroblast growth factor (bFGF).
- These bFGF-binding proteins exhibit molecular weight and binding affinity comparable to vertebrate FGF receptors.
- No detectable binding proteins for acidic fibroblast growth factor (aFGF) were found in Drosophila melanogaster cells; these cells degrade bFGF but not aFGF.
Conclusions:
- The findings indicate the presence of functional bFGF-specific binding proteins in Drosophila melanogaster.
- These results suggest a conservation of heparin-binding growth factors and their receptors between vertebrates and Drosophila.
- This conservation highlights the evolutionary importance of FGF signaling pathways across diverse species.