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The primary structure of noninitiator methionine transfer rna from bakers yeast part 1 purification and complete digestion with rnase t 1 and pancreatic rnase a ec 3.1.4.8


, : The primary structure of noninitiator methionine transfer rna from bakers yeast part 1 purification and complete digestion with rnase t 1 and pancreatic rnase a ec 3.1.4.8. Journal of Biochemistry (Tokyo) 80(5): 937-950

The methionine acceptor activity on a crude tRNA from bakers' yeast [Saccharomyces cerevisiae] was resolved into 2 peaks (I and II) by column chromatography on DEAE-Sephadex A-25 with a 1 M phosphate system. Methionine tRNA from peak II was not formylated by Escherichia coli methionyl-tRNA transformylase [EC 2.1.2.9] after being charged with methionine, whereas that from peak I was formylatable under the same conditions. A substantial amount of unlabelled methionine tRNA, .**GRAPHIC**. was highly purified from the peak II fraction by successive chromatographic procedures. The purified .**GRAPHIC**. was digested with pancreatic ribonuclease A [EC 3.1.4.22] and ribonuclease T1 [EC 3.1.4.8]. The digestion products were isolated into individual components and completely sequenced. The results of sequence analysis of the 2 RNase digests were in good agreement and indicated that the chain length of this tRNA is 76, including 13 modified nucleotides. These oligonucleotide fragments can be constructed into a unique total sequence, assuming a few conventional features of clover leaf structure for the tRNA, as in the cases of other tRNA's so far sequenced. The complete sequence of this tRNA was established by analyses of partial digestion products with RNase T1, as reported in the accompanying paper.

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Koiwai, O.; Miyazaki, M., 1976: The primary structure of noninitiator methionine transfer rna from bakers yeast part 2 partial digestion with rnase t 1 and derivation of the complete sequence. Large oligonucleotides obtained from partial RNase T1 digestion of .**GRAPHIC**. from bakers' yeast (Saccharomyces cerevisiae, strain Y 185) were isolated by chromatographic procedures and sequenced. The complete sequence of the .**GRAPHIC**....

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