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Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae
Published on: January 10, 2018
Deciphering the quantitative relationship between NRF2 and SRXN1 through semi-mechanistic computational modeling.
Raju Prasad Sharma1, Liesanne Loonstra-Wolters1, Bas Ter Braak1
1Division of Cell Systems and Drug Safety, Leiden Academic Centre for Drug Research, Leiden University, Einsteinweg 55, Leiden 2333 CC, the Netherlands.
Nuclear factor erythroid 2-related factor 2 (NRF2) activity is modulated by cofactors, influencing antioxidant response element (ARE) gene regulation. This modulation is specific to time, compound, and exposure, impacting cellular homeostasis.
Area of Science:
- Cellular biology
- Molecular biology
- Biochemistry
Background:
- Nuclear factor erythroid 2-related factor 2 (NRF2) regulates antioxidant response element (ARE) genes crucial for cellular homeostasis.
- The precise mechanisms governing NRF2 program flexibility and its downstream target regulation remain incompletely understood.
- Nrf2 activity is influenced by binding partners and cofactors, potentially varying with stressor type and non-canonical signaling pathways.
Purpose of the Study:
- To quantitatively investigate the relationship between NRF2 and its target gene, sulfiredoxin 1 (SRXN1).
- To develop and apply a mathematical model to understand the dynamics of NRF2 and SRXN1 expression.
- To elucidate the condition-specific regulatory mechanisms of NRF2 transcriptional activity.
Main Methods:
- Developed a semi-mechanistic mathematical model.
- Analyzed time-course protein expression data of NRF2 and SRXN1 in HepG2 cells.
- Utilized nonlinear mixed-effects modeling with partially hierarchical parameters.
Main Results:
- The mathematical model accurately captured experimental NRF2 and SRXN1 expression dynamics.
- NRF2 requires cofactors or post-translational modifications for its transcriptional activity.
- Modulation of NRF2 activity is specific to time, chemical compound, and exposure scenario.
Conclusions:
- NRF2 transcriptional activity is dynamically regulated by cofactors or post-translational modifications.
- Understanding NRF2-mediated ARE gene activation necessitates dynamic insights into NRF2 binding partners and cofactors.
- This study provides a quantitative framework for dissecting NRF2 regulatory flexibility.
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