期刊
JOURNAL OF MOLECULAR BIOLOGY
卷 399, 期 1, 页码 31-40出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmb.2010.04.015
关键词
NADH:ubiquinone oxidoreductase; respiratory supercomplexes; alternative respiratory pathway; Podospora anserina; life span
资金
- European Consortium [LSHM-CT-2004-512020]
- Centre National de la Recherche Scientifique
- Association Francaise contre les Myopathies
Defects in oxidative phosphorylation lie at the heart of a wide variety of degenerative disorders, cancer, and aging. Here, we show, using the fungal model Podospora anserina, that the overexpression of the native mitochondrial matrix-faced type II NADH dehydrogenase NDI1, paralogue of the human apoptosis inducing factor AIR, can fully restore all physiological consequences of respiratory complex I deficiency. We disrupted the 19.3-kDa subunit of the complex I catalytic core, orthologue of the human PSST subunit, leading to a complete absence of the complex without affecting the assembly and/or stability of the rest of the respiratory chain. This disruption caused a several-fold life span extension at the expense of both male and female fertility. The effect was generally similar but markedly milder than that caused by defects in the complex III/IV-dependent pathway and not associated with a clear reduction in the steady-state level of mitochondrial reactive oxygen species. Whereas the native expression of NDI1 was sufficient to overcome lethality, only the artificial, constitutive overexpression of NDI1 could fully remedy this deficiency: The latter strikingly restored both life span and fertility to levels indistinguishable from wild type, thus demonstrating its unique potential in molecular gene therapy. (C) 2010 Elsevier Ltd. All rights reserved.
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