Abstract
Translation of mitochondrial encoded mRNAs by mitochondrial ribosomes is thought to play a major role in regulating the expression of mitochondrial proteins. However, the structure and function of plant mitochondrial ribosomes remains poorly understood. To study mitochondrial ribosomes, it is necessary to separate them from plastidic and cytosolic ribosomes that are generally present at much higher concentrations. Here, a straight forward protocol for the preparation of fractions highly enriched in mitochondrial ribosomes from plant cells is described. The method begins with purification of mitochondria followed by mitochondrial lysis and ultracentrifugation of released ribosomes through sucrose cushions and gradients. Dark-grown Arabidopsis cells were used in this example because of the ease with which good yields of pure mitochondria can be obtained from them. However, the steps for isolation of ribosomes from mitochondria could be applied to mitochondria obtained from other sources. Proteomic analyses of resulting fractions have confirmed strong enrichment of mitochondrial ribosomal proteins.
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Acknowledgements
This work was supported by the Australian Research Council through the Australian Research Council Centre of Excellence for Plant Energy Biology (grant number CE0561495), Australian Research Council Centre of Excellence for Translational Photosynthesis (grant number CE140100015), and an Australian Research Council Future Fellowship to Guillaume Tcherkez (grant number FT140100645). Special thanks to Professor A. Harvey Millar and Dr Nicolas Taylor of The University of Western Australia and Dr Joshua Heazlewood of The University of Melbourne for invaluable training, supervision, and support with proteomic analysis.
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Carroll, A.J. (2017). Isolation of Mitochondrial Ribosomes. In: Taylor, N., Millar, A. (eds) Isolation of Plant Organelles and Structures. Methods in Molecular Biology, vol 1511. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6533-5_21
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DOI: https://doi.org/10.1007/978-1-4939-6533-5_21
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