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Insulin-Like Growth Factor Binding Protein-3 Binds to Histone 3
Apurva Bhardwaj1, Kumar Alok Pathak2,3, Anuraag Shrivastav1,2
1Department of Biology, The University of Winnipeg, Winnipeg, MB R3B 2G3, Canada.
International Journal of Molecular Sciences
|January 6, 2021
Summary
Insulin-like growth factor binding protein-3 (IGFBP-3) directly binds to histone 3 (H3). This novel protein-protein interaction suggests a new role for IGFBP-3 in regulating gene transcription via chromatin remodeling.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Insulin-like growth factor binding protein-3 (IGFBP-3) is a key regulator of cellular processes including proliferation, apoptosis, and differentiation.
- IGFBP-3 interacts with various proteins to perform its diverse cellular functions.
Purpose of the Study:
- To investigate novel protein interactions of IGFBP-3.
- To identify and characterize the binding partners of IGFBP-3 within the cell nucleus.
Main Methods:
- Sub-cellular fractionation to isolate nuclear components.
- Ligand blot, far-Western blot, and co-immunoprecipitation to identify and confirm protein interactions.
- Dot-blot assay to quantify protein binding affinity.
Main Results:
- A ~15 kDa protein interacting with IGFBP-3 was identified in the insoluble nuclear fraction.
- This 15 kDa protein was confirmed to be histone 3 (H3).
- IGFBP-3 demonstrated concentration-dependent binding to H3.
Conclusions:
- This study provides the first evidence of a direct physical interaction between IGFBP-3 and histone 3 (H3).
- The binding of IGFBP-3 to H3 suggests a potential role in chromatin remodeling and the regulation of gene transcription.
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