Chapter title |
Isolation of Mitochondrial Ribosomes.
|
---|---|
Chapter number | 21 |
Book title |
Isolation of Plant Organelles and Structures
|
Published in |
Methods in molecular biology, January 2017
|
DOI | 10.1007/978-1-4939-6533-5_21 |
Pubmed ID | |
Book ISBNs |
978-1-4939-6531-1, 978-1-4939-6533-5
|
Authors |
Adam J. Carroll |
Editors |
Nicolas L. Taylor, A. Harvey Millar |
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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