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Quantitative Analysis of NF-κB Transactivation Specificity Using a Yeast-Based Functional Assay.
Vasundhara Sharma1, Jennifer J Jordan1, Yari Ciribilli1
1Laboratory of Transcriptional Networks, Centre for Integrative Biology (CIBIO), University of Trento, Trento, Italy.
Plos One
|July 7, 2015
Summary
A novel yeast assay effectively models the NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) pathway, predicting human cell responses and identifying potential drug targets for inflammation and cancer.
Area of Science:
- Molecular Biology
- Cellular Biology
- Biochemistry
Background:
- The NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) pathway is crucial for immunity and inflammation, with its dysregulation linked to cancer.
- Understanding NF-κB protein interactions and transcriptional activity is vital for developing targeted therapies.
Purpose of the Study:
- To develop and validate a yeast-based functional assay for studying NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) activity.
- To investigate the transactivation specificity of NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) dimers and the impact of inhibitors.
- To assess the correlation between yeast assay results and human cell-based measurements.
Main Methods:
- Cloning of full-length p65 and p50 cDNAs into yeast expression vectors under an inducible promoter.
- Generation of a chimeric p50TAD construct to study transactivation potential.
- Testing transactivation specificity across seventeen different κB response elements (κB-REs).
- Validation of yeast assay results in human MCF7 cells using TNFα stimulation.
Main Results:
- NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) proteins p65 and p50TAD exhibited distinct transactivation specificities.
- Yeast assay results for four κB response elements (κB-REs) predicted transactivation in human cells.
- Transactivation in yeast correlated partially with in vitro DNA binding affinities.
- Small molecules (BAY11-7082, ethyl-pyruvate) and IkBα inhibited NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) activity in yeast.
Conclusions:
- The yeast-based NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) assay successfully recapitulates key features observed in human cells.
- This system offers a valuable platform for exploring NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) functions, interactions, and the efficacy of chemical modulators.
- The assay facilitates the investigation of NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) pathway dynamics and potential therapeutic interventions.
