The natural diterpene tonantzitlolone A and its synthetic enantiomer inhibit cell proliferation and kinesin-5 function.
Tonantzitlolone A, a diterpene isolated from the Mexican plant Stillingia sanguinolenta, shows cytostatic activity. Both the natural product tonantzitlolone A and its synthetic enantiomer induce monoastral spindle formation in cell experiments which indicates inhibitory activity on kinesin-5 mitotic motor molecules. These inhibitory effects on kinesin-5 could be verified in in vitro single-molecule motility assays, where both tonantzitlolones interfered with kinesin-5 binding to its cellular interaction partner microtubules in a concentration-dependent manner, yet with a larger effect of the synthetic enantiomer. In contrast to kinesin-5 inhibition, both tonantzitlolone A enantiomers did not affect conventional kinesin-1 function; hence tonantzitlolones are not unspecific kinesin inhibitors. The observed stronger inhibitory effect of the synthetic enantiomer demonstrates the possibility to enhance the overall moderate anti-proliferative effect of the lead compound tonantzitlolon A by chemical modification.
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Related Subject Headings
- Stereoisomerism
- Models, Molecular
- Mitosis
- Microtubules
- Mice
- Medicinal & Biomolecular Chemistry
- Macrocyclic Compounds
- Kinesins
- Humans
- Euphorbiaceae
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Start / End Page
Related Subject Headings
- Stereoisomerism
- Models, Molecular
- Mitosis
- Microtubules
- Mice
- Medicinal & Biomolecular Chemistry
- Macrocyclic Compounds
- Kinesins
- Humans
- Euphorbiaceae