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DNA interstrand cross-linking by a mycotoxic diepoxide.
J T Millard1, J L Katz, J Goda
1Department of Chemistry, Colby College, 5757 Mayflower Hill Drive, Maine Waterville, ME 04901, USA. jtmillar@colby.edu
Biochimie
|September 11, 2004
Summary
Repandiol, a diepoxide mycotoxin from Hydnum repandum, forms DNA interstrand cross-links. It is less effective than other diepoxyalkanes in cross-linking deoxyguanosine within specific DNA sequences.
Area of Science:
- Mycology
- Organic Chemistry
- Molecular Biology
Background:
- Diepoxide mycotoxins are naturally occurring compounds with potential biological activity.
- Understanding the DNA-binding and cross-linking capabilities of mycotoxins is crucial for assessing their genotoxicity.
- Hydnum repandum is a mushroom species known to produce various secondary metabolites.
Purpose of the Study:
- To isolate and synthesize the diepoxide mycotoxin repandiol.
- To investigate the DNA cross-linking activity of repandiol.
- To compare the DNA cross-linking efficiency of repandiol with known diepoxyalkanes.
Main Methods:
- Isolation of repandiol from Hydnum repandum.
- De novo chemical synthesis of repandiol.
- DNA cross-linking assays using a restriction DNA fragment.
- Sequence analysis of cross-linked DNA adducts.
Main Results:
- Repandiol was successfully isolated and synthesized.
- Repandiol formed interstrand cross-links in DNA, primarily at 5'-GNC and 5'-GNNC sequences.
- Repandiol demonstrated significantly lower DNA cross-linking efficiency compared to diepoxyoctane and diepoxybutane.
Conclusions:
- Repandiol is a DNA interstrand cross-linking agent.
- The DNA cross-linking activity of repandiol is sequence-specific.
- Repandiol is a less potent DNA cross-linker than other studied diepoxyalkanes.