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Nuclear receptor binding factor-1 (NRBF-1), a protein interacting with a wide spectrum of nuclear hormone receptors
N Masuda1, H Yasumo, T Furusawa
1Department of Life Science, Himeji Institute of Technology, Kamigori, Hyogo 678-1297, Japan.
Abstract:
To identify the proteins which may modulate the functions of peroxisome proliferator-activated receptor (PPAR), a rat liver cDNA library was screened by a yeast two-hybrid system, using the mouse PPARalpha as a bait. A protein named nuclear receptor binding factor-1 (NRBF-1) was identified, which interacts not only with PPARalpha, but also with various nuclear hormone receptors in the presence of the respective ligands. Both the hinge and ligand-binding domains of PPARalpha are required for the interaction. NRBF-1 seems to be translocated to the nucleus by a piggyback mechanism, together with PPARalpha. NRBF-1 has a significant homology to the yeast protein MRF1, a putative transcription factor regulating the expression of mitochondrial respiratory proteins. NRBF-1 might be another type of nuclear receptor co-operator.
Insights
Researchers identified nuclear receptor binding factor-1 (NRBF-1), a protein that interacts with peroxisome proliferator-activated receptor alpha (PPARα) and other nuclear receptors. NRBF-1 may act as a co-operator, influencing nuclear receptor functions.
Area of Science:
- Molecular Biology
- Cellular Biology
- Biochemistry
Background:
- Peroxisome proliferator-activated receptors (PPARs) are crucial nuclear receptors regulating gene expression.
- Understanding proteins that modulate PPAR function is key to deciphering complex cellular signaling pathways.
Purpose of the Study:
- To identify novel proteins interacting with and potentially modulating the function of PPAR.
- To characterize the interaction between PPAR and newly identified binding partners.
Main Methods:
- Yeast two-hybrid screening using mouse PPARalpha as bait to identify interacting proteins from a rat liver cDNA library.
- Analysis of protein-protein interactions, including domain requirements and subcellular localization.
- Homology analysis comparing the identified protein to known proteins.
Main Results:
- A novel protein, nuclear receptor binding factor-1 (NRBF-1), was identified as a PPARalpha interacting partner.
- NRBF-1 interacts with PPARalpha via both hinge and ligand-binding domains and also binds to other nuclear hormone receptors in a ligand-dependent manner.
- NRBF-1 appears to be translocated to the nucleus via a piggyback mechanism with PPARalpha.
- NRBF-1 shows homology to yeast MRF1, a putative transcription factor.
Conclusions:
- NRBF-1 is a novel nuclear receptor binding factor that interacts with PPARalpha and other nuclear receptors.
- NRBF-1 may function as a co-operator protein, influencing the activity of nuclear receptors.
- The identification of NRBF-1 provides new insights into the regulation of nuclear receptor signaling pathways.