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Reducing Holomycin Thiosulfonate to its Disulfide with Thiols
Andrew N Chan1, Walter J Wever2, Elisabetta Massolo1
1Department of Chemistry , University of North Carolina at Chapel Hill , CB #3290, Chapel Hill , North Carolina 27599 , United States.
Dithiolopyrrolone thiosulfonates, like oxo-holomycin, undergo unique redox reactions. They oxidize thiols to disulfides, revealing novel chemistry for these natural products.
Area of Science:
- Natural Product Chemistry
- Medicinal Chemistry
- Biochemistry
Background:
- Dithiolopyrrolones (DTPs) are natural products with antimicrobial and anticancer properties.
- A key structural feature is the ene-disulfide moiety, crucial for bioactivity.
- Some DTPs exist as oxidized cyclic thiosulfonates, but their biomolecular reactivity is poorly understood.
Purpose of the Study:
- To investigate the reactivity of DTP thiosulfonates with biomolecules.
- To elucidate the redox chemistry of oxo-holomycin, a thiosulfonate derivative of holomycin.
Main Methods:
- Studied the reaction of oxo-holomycin with small molecule and protein thiols.
- Analyzed the redox products formed during the reaction.
Main Results:
- Discovered a unique redox reaction: oxo-holomycin is reduced to its parent disulfide.
- Observed oxidation of small molecule and protein thiols to their corresponding disulfides.
- Demonstrated that the DTP scaffold undergoes unusual redox chemistry.
Conclusions:
- The DTP core is a privileged scaffold with unique redox properties.
- The observed redox chemistry may contribute to the mechanism of action of DTP natural products.
- This finding opens new avenues for understanding and utilizing DTPs in therapeutic applications.
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