Abstract
I describe here a protocol for the analysis of mitochondrial protein synthesis as a useful tool to characterize the mitochondrial defects associated with mutations in mitochondrial tRNA genes. The yeast Saccharomyces cerevisiae mutants, bearing human equivalent pathogenic mutations, were used as a simple model for analysis. The mitochondrial proteins were labeled by L[35S]-methionine incorporation in growing cells, extracted from purified mitochondria, and fractionated by SDS-polyacrylamide gel electrophoresis followed by autoradiography. By this method, it is possible to distinguish different protein synthesis profiles in the analyzed mitochondrial tRNA mutants.
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