Sibler A P, Dirheimer G, Martin R P
Nucleic Acids Res. 1985 Feb 25;13(4):1341-5. doi: 10.1093/nar/13.4.1341.
The nucleotide sequence of yeast mitochondrial isoleucine- and methionine-elongator tRNA have been determined. Interestingly, long stretches of almost identical nucleotide sequences are found within these two tRNAs and also within the yeast mt tRNAMetf, suggesting that the 3 tRNAs may have arisen from a common ancestor. Both mt tRNAMetm and tRNAIle contain all the structural characteristics which are present in the standard cloverleaf, except that the mt tRNAMetm contains an extra unpaired nucleotide within the base-paired T psi C stem. This rather unusual feature may have an influence on the decoding properties of the C-A-U anticodon of mt tRNAMetm by conferring the ability to translate not only the codon A-U-G but also A-U-A.
已确定酵母线粒体异亮氨酸和甲硫氨酸延伸tRNA的核苷酸序列。有趣的是,在这两种tRNA以及酵母线粒体甲硫氨酸起始tRNA(mt tRNAMetf)中都发现了长段几乎相同的核苷酸序列,这表明这三种tRNA可能起源于一个共同的祖先。线粒体甲硫氨酸tRNA(mt tRNAMetm)和异亮氨酸tRNA(tRNAIle)都具备标准三叶草结构的所有结构特征,只是mt tRNAMetm在碱基配对的TψC茎内含有一个额外的未配对核苷酸。这一相当不寻常的特征可能会影响mt tRNAMetm中C - A - U反密码子的解码特性,使其不仅能够翻译密码子A - U - G,还能翻译A - U - A。