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Journal Article
Research Support, Non-U.S. Gov't
MMS19 localizes to mitochondria and protects the mitochondrial genome from oxidative damage.
Biochemistry and Cell Biology 2018 Februrary
MMS19 localizes to the cytoplasmic and nuclear compartments involved in transcription and nucleotide excision repair (NER). However, whether MMS19 localizes to mitochondria, where it plays a role in maintaining mitochondrial genome stability, remains unknown. In this study, we provide the first evidence that MMS19 is localized in the inner membrane of mitochondria and participates in mtDNA oxidative damage repair. MMS19 knockdown led to mitochondrial dysfunctions including decreased mtDNA copy number, diminished mtDNA repair capacity, and elevated levels of mtDNA common deletion after oxidative stress. Immunoprecipitation - mass spectrometry analysis identified that MMS19 interacts with ANT2, a protein associated with mitochondrial ATP metabolism. ANT2 knockdown also resulted in a decreased mtDNA repair capacity after oxidative damage. Our findings suggest that MMS19 plays an essential role in maintaining mitochondrial genome stability.
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