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Molecular and Cellular Biology, May 1999, p. 3435-3442, Vol. 19, No. 5
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Prohibitins Regulate Membrane Protein Degradation by the m-AAA Protease in Mitochondria

Gregor Steglich, Walter Neupert, and Thomas Langer*

Institut für Physiologische Chemie der Universität München, 80336 Munich, Germany

Received 9 December 1998/Returned for modification 21 January 1998/Accepted 30 January 1999

Prohibitins comprise a protein family in eukaryotic cells with potential roles in senescence and tumor suppression. Phb1p and Phb2p, members of the prohibitin family in Saccharomyces cerevisiae, have been implicated in the regulation of the replicative life span of the cells and in the maintenance of mitochondrial morphology. The functional activities of these proteins, however, have not been elucidated. We demonstrate here that prohibitins regulate the turnover of membrane proteins by the m-AAA protease, a conserved ATP-dependent protease in the inner membrane of mitochondria. The m-AAA protease is composed of the homologous subunits Yta10p (Afg3p) and Yta12p (Rca1p). Deletion of PHB1 or PHB2 impairs growth of Delta yta10 or Delta yta12 cells but does not affect cell growth in the presence of the m-AAA protease. A prohibitin complex with a native molecular mass of approximately 2 MDa containing Phb1p and Phb2p forms a supercomplex with the m-AAA protease. Proteolysis of nonassembled inner membrane proteins by the m-AAA protease is accelerated in mitochondria lacking Phb1p or Phb2p, indicating a negative regulatory effect of prohibitins on m-AAA protease activity. These results functionally link members of two conserved protein families in eukaryotes to the degradation of membrane proteins in mitochondria.

* Corresponding author. Mailing address: Institut für Physiologische Chemie, Goethestr. 33, 80336 Munich, Germany. Phone: 49 89 5996 283. Fax: 49 89 5996 270. E-mail: Langer{at}bio.med.uni-muenchen.de.

Molecular and Cellular Biology, May 1999, p. 3435-3442, Vol. 19, No. 5
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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