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Phenotypical consequences of expressing the dually targeted Presequence Protease, AtPreP, exclusively in mitochondria.

Biochimie. 2014 May;100:167-70. Epub 2013 Dec 25
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摘要


Endosymbiotic organelles, mitochondria and chloroplasts, are sites of an intensive protein synthesis and degradation. A consequence of these processes is production of both free targeting peptides, i.e. mitochondrial presequences and chloroplastic transit peptides, and other short unstructured peptides. Mitochondrial, as well as chloroplastic peptides are degraded by Presequence Protease (PreP), which is dually targeted to mitochondrial matrix and chloroplastic stroma. Elimination of PreP in Arabidopsis thaliana leads to growth retardation, chlorosis and impairment of mitochondrial functions potentially due to the accumulation of targeting peptides. In this work we analyzed the influence of the restoration of mitochondrial peptide degradation by AtPreP on plant phenotype. We showed that exclusive mitochondrial expression of AtPreP results in total restoration of the proteolytic activity, but it does not restore the wild-type phenotype. The plants grow shorter roots and smaller rosettes compared to the plants expressing AtPreP1 in both mitochondria and chloroplasts. With this analysis we are aiming at understanding the physiological impact of the role of the dually targeted AtPreP in single type of destination organelle.

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