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MBC in Press, published online ahead of print November 19, 2008
Mol. Biol. Cell 10.1091/mbc.E07-11-1112

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Submitted on November 6, 2007
Revised on November 6, 2008
Accepted on November 10, 2008

The m-AAA Protease Processes Cytochrome c Peroxidase Preferentially at the Inner Boundary Membrane of Mitochondria

Ida E. Suppanz,*{dagger} Christian A. Wurm,* Dirk Wenzel,{ddagger} and Stefan Jakobs*

*Department of NanoBiophotonics / Mitochondrial Structure and Dynamics, and {ddagger}Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany; {dagger}Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany

Monitoring Editor: Janet M. Shaw

The m-AAA protease is a conserved hetero-oligomeric complex in the inner membrane of mitochondria. Recent evidence suggests a compartmentalization of the contiguous mitochondrial inner membrane into an inner boundary membrane (IBM) and a cristae membrane (CM). However, little is known about the functional differences of these subdomains. We have analyzed the localizations of the m-AAA protease and its substrate cytochrome c peroxidase (Ccp1) within yeast mitochondria using live cell fluorescence microscopy and quantitative immunoelectron microscopy. We find that the m-AAA protease is preferentially localized in the IBM. Likewise, the membrane anchored precursor form of Ccp1 accumulates in the IBM of mitochondria lacking a functional m-AAA protease. Only upon proteolytic cleavage the mature form mCcp1 moves into the cristae space. These findings suggest that protein quality control and proteolytic activation exerted by the m-AAA protease take place preferentially in the IBM pointing to significant functional differences between the IBM and the CM.

Address correspondence to: Stefan Jakobs (sjakobs{at}gwdg.de)






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