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Adding epitope tags to proteins is an important method for biochemical analyses and is generally accomplished in metazoan cells using ectopically expressed, tagged trans-genes. In Saccharomyces cerevisiae, the addition of epitope tags to proteins is easily achieved at the genomic locus of a gene of interest due to the high efficiency of homologous recombination in that organism. Most metazoan cells...
Pre-mRNA introns are spliced in a macromolecular machine, the spliceosome. For each round of splicing, the spliceosome assembles de novo in a series of ATP-dependent steps involving numerous changes in RNA-RNA and RNA-protein interactions. As currently understood, spliceosome assembly proceeds by addition of discrete U1, U2, and U4/U6*U5 snRNPs to a pre-mRNA substrate to form functional splicing complexes...
The splicing of tRNA precursors is essential for the production of mature tRNA in organisms from all major phyla. In yeast, the tRNA splicing endonuclease is responsible for identification and cleavage of the splice sites in pre-tRNA. We have cloned the genes encoding all four protein subunits of endonuclease. Each gene is essential. Two subunits, Sen2p and Sen34p, contain a homologous domain of approximately...
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