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ID: 20768.0, MPI für biophysikalische Chemie / NanoBiophotonik (Dr. Stefan Hell)
The inner membrane protein Mdm33 controls mitochondrial morphology in yeast
Authors:Messerschmitt, M.; Jakobs, S.; Vogel, F.; Fritz, S.; Dimmer, K. S.; Neupert, W.; Westermann, B.
Date of Publication (YYYY-MM-DD):2003-02-17
Title of Journal:Journal of Cell Biology
Issue / Number:4
Start Page:553
End Page:564
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Mitochondrial distribution and morphology depend on MDM33, a Saccharomyces cerevisiae gene encoding a novel protein of the mitochondrial inner membrane. Cells lacking Mdm33 contain ring- shaped, mostly interconnected mitochondria, which are able to form large hollow spheres. On the ultrastructural level, these aberrant organelles display extremely elongated stretches of outer and inner membranes enclosing a very narrow matrix space. Dilated parts of Deltamdm33 mitochondria contain well-developed cristae. Overexpression of Mdm33 leads to growth arrest, aggregation of mitochondria, and generation of aberrant inner membrane structures, including septa, inner membrane fragments, and loss of inner membrane cristae. The MDM33 gene is required for the formation of net-like mitochondria in mutants lacking components of the outer membrane fission machinery, and mitochondrial fusion is required for the formation of extended ring-like mitochondria in cells lacking the MDM33 gene. The Mdm33 protein assembles into an oligomeric complex in the inner membrane where it performs homotypic protein-protein interactions. Our results indicate that Mdm33 plays a distinct role in the mitochondrial inner membrane to control mitochondrial morphology. We propose that Mdm33 is involved in fission of the mitochondrial inner membrane
Free Keywords:membrane fission; mitochondria; mitochondrial dynamics; organelle morphology; Saccharomyces cerevisiae
Comment of the Author/Creator:Date: 2003, FEB 17
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für biophysikalische Chemie/AG Stefan Jakobs
External Affiliations:Univ Munich, Inst Physiol Chem, Butenandtstr 5, D-81377 Munich,Germany; Max Delbruck Ctr Mol Med, Electron Microscopy Grp, D-13092 Berlin, Germany
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