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Eukaryotic Cell, December 2003, p. 1315-1326, Vol. 2, No. 6
1535-9778/03/$08.00+0     DOI: 10.1128/EC.2.6.1315-1326.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Two Dictyostelium Orthologs of the Prokaryotic Cell Division Protein FtsZ Localize to Mitochondria and Are Required for the Maintenance of Normal Mitochondrial Morphology

Paul R. Gilson,1* Xuan-Chuan Yu,2 Dale Hereld,2 Christian Barth,3 Amelia Savage,1 Ben R. Kiefel,1 Sui Lay,3 Paul R. Fisher,3 William Margolin,2 and Peter L. Beech1

Centre for Cellular and Molecular Biology, School of Biological and Chemical Sciences, Deakin University, Victoria 3125,1 Department of Microbiology, La Trobe University, Bundoora, Victoria 3083, Australia,3 Department of Microbiology and Molecular Genetics, University of Texas Medical School, Houston, Texas 770302

Received 6 May 2003/ Accepted 13 August 2003

In bacteria, the protein FtsZ is the principal component of a ring that constricts the cell at division. Though all mitochondria probably arose through a single, ancient bacterial endosymbiosis, the mitochondria of only certain protists appear to have retained FtsZ, and the protein is absent from the mitochondria of fungi, animals, and higher plants. We have investigated the role that FtsZ plays in mitochondrial division in the genetically tractable protist Dictyostelium discoideum, which has two nuclearly encoded FtsZs, FszA and FszB, that are targeted to the inside of mitochondria. In most wild-type amoebae, the mitochondria are spherical or rod-shaped, but in fsz-null mutants they become elongated into tubules, indicating that a decrease in mitochondrial division has occurred. In support of this role in organelle division, antibodies to FszA and FszA-green fluorescent protein (GFP) show belts and puncta at multiple places along the mitochondria, which may define future or recent sites of division. FszB-GFP, in contrast, locates to an electron-dense, submitochondrial body usually located at one end of the organelle, but how it functions during division is unclear. This is the first demonstration of two differentially localized FtsZs within the one organelle, and it points to a divergence in the roles of these two proteins.

* Corresponding author. Present address: The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Victoria 3050, Australia. Phone: 61 3 9345 2472. Fax: 61 3 9347 0852. E-mail: gilson{at}wehi.edu.au.

Eukaryotic Cell, December 2003, p. 1315-1326, Vol. 2, No. 6
1535-9778/03/$08.00+0     DOI: 10.1128/EC.2.6.1315-1326.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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