Abstract
Cytoplasmic initiator transfer ribonucleic acid (tRNAinit) was purified from bulk Torulopsis (Candida) utilis tRNA by a series of column chromatography procedures. Sequence analysis of the products of complete and partial digestion of this tRNA with ribonuclease A [EC 3.1.4.22] and ribonuclease T1 [EC 3.1.4.8] enabled us to determine the complete primary structure of the molecule. The chain length of this tRNA was 76, including 11 modified nucleotides. The structure of the tRNA was arranged into a cloverleaf model and compared with those of other initiator tRNA species. As in the cytoplasmic initiator tRNA's of most other eukaryotic cells, the sequence -A-U-C-G- is contained in this tRNA in place of the usual -T-psi-C-G (or A)- found in other tRNA's.
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