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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Document, Thesis/dissertation, Internet resource |
Document Type: | Internet Resource, Computer File |
All Authors / Contributors: |
Djaha Edgar Yoboue; Anne Devin, chercheur en biologie).; Université Bordeaux-II (1971-2013).; École doctorale Sciences de la vie et de la santé (Bordeaux). |
OCLC Number: | 801058176 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Djaha Edgar Yoboue ; sous la direction de Anne Devin. |
Abstract:
Mitochondria are organelles that play important functions in eukaryotic cell especially in energy metabolism. According to the physiological state (for example energy demand variation), mitochondrial content can vary in large amounts within the cell. These variations involve the modification of mitochondrial biogenesis which is a complex process which depends on many proteins and both nuclear and mitochondrial genomes. We studied the regulation of mitochondrial biogenesis in the yeast Saccharomyces cerevisiae. In this organism, a key component of mitochondrial biogenesis is the heteromeric transcription factor HAP. It is constituted by 4 subunits, Hap4p being the activator subunit. We showed a regulation of Hap4p protein by oxidative stress and the glutathione redox state. Thus, oxidative stress induced by pro-oxidants or by mitochondrial respiratory chain dysfunction leads to a decrease in the Hap4p protein level. This decrease of Hap4p leads to a decrease in mitochondrial markers level such as cytochromes and a decrease of the respiratory and growth rates. We also interested in the regulation of the HAP complex by heme. Our results are the first to clearly show a positive regulation of Hap4p level by heme and also suggest a post-translational regulation of Hap4p by the heme redox state. Altogether, these results represent novel pieces to the study of the mitochondria-nucleus communication and the regulation of mitochondrial biogenesis.
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