Timon-Gomez 2014 Abstract MiP2014
|The function of mitochondrial pyruvate carriers in the adaptation of respiration capacity and stress tolerance in yeast.|
Yeast cells adapt mitochondrial morphology, biomass and activity to changing environmental conditions in a dynamic manner. Here we investigate the mechanisms of mitochondrial adaptation to different respiration rates, oxidative and salt stress.
Specifically, we identifed the MPC gene family as particularly regulated upon changes from fermentative to respiratory growth or upon stress. Mpc proteins are highly conserved from yeast to humans and are necessary for the uptake of pyruvate into mitochondria [1,2], which is used for leucine and valine biosynthesis and as a fuel for respiration.
The highly similar Mpc2 and Mpc3 proteins are regulated in an antagonistic manner: Mpc2 is most abundant under fermentative non-stress conditions and important for amino acid biosynthesis, while Mpc3 is most abundant upon salt stress or respiratory growth. Overexpression experiments demonstrate that Mpc3 stimulates respiration and oxidative stress tolerance, while Mpc2 inhibits respiration and oxidative stress tolerance. Therefore, the regulated mitochondrial pyruvate uptake via different Mpc proteins might be an important determinant of respiration rate and stress resistance . We additionally analyzed the degradation rate of different respiratory complex subunits in response to higher respiration rates and mitochondrial damage.
Labels: MiParea: Respiration, Comparative MiP;environmental MiP
Stress:Oxidative stress;RONS Organism: Saccharomyces cerevisiae
Preparation: Intact organism
Event: B3, P-flash MiP2014: salt stress
Inst Biol Mol Celular Plantas, CSIC-Univ Politécnica Valencia, Spain. - [email protected]
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