西亚试剂：Mitochondrial Import Efficiency of ATFS-1 Regulates Mitocho

Mitochondrial Import Efficiency of ATFS-1 Regulates Mitochondrial UPR Activation

Amrita M. Nargund1,*, Mark W. Pellegrino1,*, Christopher J. Fiorese1,2, Brooke M. Baker1, Cole M. Haynes

To better understand the response to mitochondrial dysfunction, we examined the mechanism by which Activating Transcription Factor associated with Stress-1 (ATFS-1) senses mitochondrial stress and communicates with the nucleus during the mitochondrial unfolded protein response (UPRmt). We found that the key point of regulation was the mitochondrial import efficiency of ATFS-1. In addition to a nuclear localization sequence, ATFS-1 has an amino-terminal mitochondrial targeting sequence, which was essential for UPRmt repression. Normally, ATFS-1 is imported into mitochondria and degraded. However, during mitochondrial stress, import efficiency was reduced, allowing a percentage of ATFS-1 to accumulate in the cytosol and traffic to the nucleus. Our results show that cells monitor mitochondrial import efficiency via ATFS-1 to coordinate the level of mitochondrial dysfunction with the protective transcriptional response.

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