期刊
SCIENCE
卷 336, 期 6086, 页码 1306-1310出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1218632
关键词
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资金
- Agentschap voor Innovatie door Wetenschap en Technologie (IWT)-Vlaanderen
- European Research Council [260678]
- Fonds Voor Wetenschappelijk Onderzoek [G074709-G095511-G094011]
- KU Leuven
- Methusalem grant
- Hercules foundation
- Francqui foundation
- VIB
Human UBIAD1 localizes to mitochondria and converts vitamin K-1 to vitamin K-2. Vitamin K-2 is best known as a cofactor in blood coagulation, but in bacteria it is a membrane-bound electron carrier. Whether vitamin K-2 exerts a similar carrier function in eukaryotic cells is unknown. We identified Drosophila UBIAD1/Heix as a modifier of pink1, a gene mutated in Parkinson's disease that affects mitochondrial function. We found that vitamin K-2 was necessary and sufficient to transfer electrons in Drosophila mitochondria. Heix mutants showed severe mitochondrial defects that were rescued by vitamin K-2, and, similar to ubiquinone, vitamin K-2 transferred electrons in Drosophila mitochondria, resulting in more efficient adenosine triphosphate (ATP) production. Thus, mitochondrial dysfunction was rescued by vitamin K-2 that serves as a mitochondrial electron carrier, helping to maintain normal ATP production.
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