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Eukaryotic Cell doi:10.1128/EC.00048-07
Copyright (c) 2008, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

Bot1p is required for mitochondrial translation, respiratory function and normal cell morphology in the fission yeast Schizosaccharomyces pombe

Department of Molecular and Cellular Pharmacology, Department of Neurology and Department of Biochemistry & Molecular Biology, The John T. MacDonald Center for Medical Genetics. University of Miami School of Medicine, P.O.Box 016129. Miami, FL, 33101-6129

^* To whom correspondence should be addressed. Email: fverde{at}miami.edu.

	Abstract

Maintenance of cell morphology is essential for normal cell function. In eukaryotic cells, a growing body of recent evidence highlights a close interdependence between mitochondrial function, the cytoskeleton, and cell cycle control mechanisms, however the molecular details of this interconnection are still not completely understood. We have identified a novel protein, Bot1p, in the fission yeast Schizosaccharomyces pombe. The bot1 gene is essential for cell viability. bot1 mutant cells expressing lower levels of Bot1p display altered cell size and cell morphology, and a disrupted actin cytoskeleton. Bot1p localizes to the mitochondria in live cells and co-fractionates with purified mitochondrial ribosomes. Reduced levels of Bot1p lead to mitochondrial fragmentation, decreased mitochondrial protein translation, and to a corresponding decrease in cell respiration. Over-expression of Bot1p results in cell cycle delay, with increased cell size and cell length, and enhanced cell respiration rate. Our results show that Bot1p has a novel function in the control of cell respiration by acting on the mitochondrial protein synthesis machinery. Our observations also indicate that in fission yeast, alterations of mitochondrial function are linked to changes in cell cycle and cell morphology control mechanisms.