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- W2600977066 abstract "We have found that granzyme B (GB)-induced apoptosis also requires reactive oxygen species resulting from the alteration of mitochondrial complex I. How GB, which does not possess a mitochondrial targeting sequence, enter this organelle is unknown. We show that GB enters the mitochondria independently of the translocase of the outer mitochondrial membrane complex, but requires instead Sam50, the central subunit of the sorting and assembly machinery that integrates outer membrane β-barrel proteins. Moreover, GB breaches the inner membrane through Tim22, the metabolite carrier translocase pore, in a mitochondrial heat-shock protein 70 (mtHsp70)-dependent manner. Granzyme A (GA) and caspase-3 use a similar route to the mitochondria. Finally, preventing GB from entering the mitochondria either by mutating lysine 243 and arginine 244 or depleting Sam50 renders cells more resistant to GB-mediated reactive oxygen species and cell death. Similarly, Sam50 depletion protects cells from GA-, GM- and caspase-3-mediated cell death. Therefore, cytotoxic molecules enter the mitochondria to induce efficiently cell death through a noncanonical Sam50-, Tim22- and mtHsp70-dependent import pathway." @default.
- W2600977066 created "2017-04-07" @default.
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- W2600977066 date "2017-03-24" @default.
- W2600977066 modified "2023-10-15" @default.
- W2600977066 title "Granzyme B enters the mitochondria in a Sam50-, Tim22- and mtHsp70-dependent manner to induce apoptosis" @default.
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- W2600977066 doi "https://doi.org/10.1038/cdd.2017.3" @default.
- W2600977066 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5384031" @default.
- W2600977066 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28338658" @default.
- W2600977066 hasPublicationYear "2017" @default.
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