Abstract |
Lamellarin D ( Lam-D) is a hexacyclic pyrole alkaloid isolated from marine invertebrates, whose biologic properties have been attributed to mitochondrial targeting. Mitochondria contain their own DNA ( mtDNA), and the only specific mitochondrial topoisomerase in vertebrates is mitochondrial topoisomerase I (Top1mt). Here, we show that Top1mt is a direct mitochondrial target of Lam-D. In vitro Lam-D traps Top1mt and induces Top1mt cleavage complexes (Top1mtcc). Using single-molecule analyses, we also show that Lam-D slows down supercoil relaxation of Top1mt and strongly inhibits Top1mt religation in contrast to the inefficacy of camptothecin on Top1mt. In living cells, we show that Lam-D accumulates rapidly inside mitochondria, induces cellular Top1mtcc, and leads to mtDNA damage. This study provides evidence that Top1mt is a direct mitochondrial target of Lam-D and suggests that developing Top1mt inhibitors represents a novel strategy for targeting mitochondrial DNA.
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Authors | Salim Khiati, Yeonee Seol, Keli Agama, Ilaria Dalla Rosa, Surbhi Agrawal, Katherine Fesen, Hongliang Zhang, Keir C Neuman, Yves Pommier |
Journal | Molecular pharmacology
(Mol Pharmacol)
Vol. 86
Issue 2
Pg. 193-9
(Aug 2014)
ISSN: 1521-0111 [Electronic] United States |
PMID | 24890608
(Publication Type: Journal Article, Research Support, N.I.H., Intramural)
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Copyright | U.S. Government work not protected by U.S. copyright. |
Chemical References |
- Coumarins
- DNA, Mitochondrial
- Heterocyclic Compounds, 4 or More Rings
- Isoquinolines
- lamellarin D
- DNA Topoisomerases, Type I
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Topics |
- Cell Line, Tumor
- Coumarins
(pharmacology)
- DNA Topoisomerases, Type I
(genetics, metabolism)
- DNA, Mitochondrial
(genetics, metabolism)
- Heterocyclic Compounds, 4 or More Rings
(pharmacology)
- Humans
- Isoquinolines
(pharmacology)
- Mitochondria
(drug effects, genetics, metabolism)
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