Abstract
The expression of mutant yeast 5S rRNA genes in vivo is reviewed as a basis for further studies on the structure, function, and regulation of the ribosomal 5S rRNA. Specific base substitutions, insertions, or deletions can result in substantial structural changes which can be detected readily by gel electrophoresis, permitting the assay of mutant RNA synthesis and utilization. Furthermore, the use of high and low copy shuttle vectors, as well as alternate growth conditions, permits a wide adjustment of the mutant RNA concentration. Under optimized conditions more than 80% of the cell's RNA can be replaced with mutant molecules. The application of this strategy to studies on the biosynthesis and structure of the 5S rRNA are demonstrated through recently isolated mutations.
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