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Human 5-lipoxygenase contains an essential iron
1Department of Biochemistry, Merck Frosst Centre for Therapeutic Research, Pointe-Claire-Dorval, Québec.
The Journal of Biological Chemistry
|June 5, 1991
Summary
Human 5-lipoxygenase activity correlates with iron content. Active enzyme contains iron, while inactive enzyme lacks it, indicating iron
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- Human 5-lipoxygenase is a key enzyme in inflammatory pathways.
- Understanding its cofactor requirements is crucial for therapeutic targeting.
Purpose of the Study:
- To quantify the iron content of human 5-lipoxygenase.
- To investigate the relationship between iron content and enzyme activity.
Main Methods:
- Purification of human 5-lipoxygenase using baculovirus expression and ATP-agarose chromatography.
- Colorimetric assay using FerroZine to determine iron concentration.
- Correlation analysis between enzyme specific activity and iron content.
Main Results:
- A linear correlation was established between 5-lipoxygenase specific activity and iron content.
- Highly active enzyme preparations contained 1.1 mol of iron per mole of enzyme.
- Inactive enzyme preparations showed no detectable iron content.
Conclusions:
- Iron is a critical component of active human 5-lipoxygenase.
- Iron is tightly bound and its release requires enzyme inactivation.
- These findings have implications for understanding 5-lipoxygenase function and developing inhibitors.