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In eukaryotic cells, especially in yeast, several genes encoding tRNAs contain introns. These are removed from pre-tRNAs during the maturation process by a tRNA-specific splicing machinery that is located within the nucleus at the nuclear envelope. Before and after the intron removal, several nucleoside modifications are added in a stepwise manner, but most of them are introduced prior to intron...
The primordial role of the CAU anticodon in methionine identity of the tRNA has been established by others nearly a decade ago in Escherichia coli and yeast tRNA Met . We show here that the CAU triplet alone is unable to confer methionine acceptance to a tRNA. This requires the contribution of the discriminatory base A73 and the non-anticodon bases of the anticodon loop. To better...
Native cytoplasmic phenylalanyl-tRNA synthetase from baker's yeast is a tetramer of the α 2 β 2 type. On mild tryptic cleavage it gives rise to a modified 2 β' 2 form that has lost the tRNA Phe binding capacity but is still able to activate phenylalanine. In this paper are presented data concerning peptides released by this limited proteolytic conversion...
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