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Mitochondrial functions and aging.

Heinz D Osiewacz¹

¹Johann Wolfgang Goethe-Universität, Botanisches Institut, Molekulare Entwicklungsbiologie und Biotechnologie, Marie-Curie-Strasse 9, D-60439 Frankfurt/Main, Germany. osiewacz@em.uni-frankfurt.de

|April 12, 2002

Summary

Copper homeostasis, regulated by GRISEA, impacts mitochondrial function and lifespan in Podospora anserina. A backup system using alternative oxidase (PaAOX) compensates for copper deficiency, reducing damage and extending lifespan.

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Area of Science:

Molecular Biology
Mitochondrial Biology
Aging Research

Background:

Mitochondria are crucial for lifespan control in Podospora anserina.
The transcription factor GRISEA regulates cellular copper homeostasis and mitochondrial function.
Copper is essential for Complex IV assembly and function in the respiratory chain.

Purpose of the Study:

To investigate the role of GRISEA and copper in Podospora anserina lifespan.
To elucidate the mechanisms compensating for impaired copper delivery to mitochondria.
To explore the impact of copper availability on mitochondrial DNA rearrangements.

Main Methods:

Analysis of the GRISEA transcription factor's role in copper uptake.
Characterization of the copper chaperone PaCOX17 in mitochondrial copper delivery.
Investigation of the alternative oxidase (PaAOX) pathway as a backup system.
Assessment of copper's influence on mitochondrial DNA stability.

Main Results:

GRISEA controls high-affinity copper uptake, essential for mitochondrial Complex IV.
Impaired copper delivery activates the alternative oxidase (PaAOX), reducing reactive oxygen species and increasing lifespan.
Copper availability influences age-related mitochondrial DNA rearrangements.

Conclusions:

Copper homeostasis is a key determinant of lifespan in P. anserina.
The PaAOX pathway provides a crucial survival mechanism under copper-deficient conditions.
Copper's role extends to maintaining mitochondrial DNA integrity during aging.

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