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Structure-function studies of aromatase and its inhibitors: a progress report
Shiuan Chen1, Fangming Zhang, Mark A Sherman
1Divisions of Immunology and Informational Sciences, Beckman Research Institute of the City of Hope, Duarte, CA, USA. schen@coh.org
The Journal of Steroid Biochemistry and Molecular Biology
|November 19, 2003
Summary
Researchers investigated aromatase enzyme structure and inhibitor interactions using computational modeling and mutagenesis. This work aids in understanding enzyme mechanisms and predicting environmental chemical impacts, with applications in breast cancer research and natural product discovery.
Area of Science:
- Biochemistry
- Enzyme kinetics
- Molecular biology
Background:
- Aromatase is a key enzyme in estrogen biosynthesis.
- Understanding aromatase structure-function is crucial for developing inhibitors and predicting chemical interactions.
- Estrogen receptor-positive breast cancer is often driven by estrogen, making aromatase a therapeutic target.
Purpose of the Study:
- To elucidate the structure-function relationship of aromatase and its inhibitors.
- To understand the binding of steroidal and non-steroidal inhibitors to the aromatase active site.
- To evaluate the efficacy of aromatase inhibitors in preclinical models of breast cancer.
Main Methods:
- Computer modeling and simulation.
- Site-directed mutagenesis and enzyme kinetics.
- Metabolite analysis and protein expression (Escherichia coli).
- Three-dimensional cell cultures and in vivo mouse models.
Main Results:
- Detailed insights into how aromatase inhibitors bind to the enzyme's active site.
- Successful expression and purification of active recombinant aromatase in E. coli.
- Demonstrated the utility of 3D cell cultures for assessing inhibitor efficacy.
- Identified phytochemicals as potent aromatase inhibitors, showing in vivo suppression of tumor growth and hyperplasia.
Conclusions:
- Structure-function studies provide a basis for designing novel aromatase inhibitors.
- Recombinant aromatase expressed in E. coli is a valuable tool for further research.
- Phytochemicals represent a promising source of natural aromatase inhibitors for therapeutic use.
- 3D cell cultures and in vivo models are effective for evaluating anti-cancer drug candidates.