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Nucleic Acids Research, 1985, Vol. 13, No. 4 1341-1345
© 1985

Articles

Yeast mitochondrial tRNAIle and tRNAmMet: nucleotide sequence and codon recognition patterns

A.P. Sibler, G. Dirheirner and R.P. Martin

Laboratoire de Biochimie II, Institut de Biologie Moléculaire Cellulaire du CNRS 15 rue Descartes, 67084 Strasbourg, France

Received December 14, 1984. Accepted January 16, 1985.

The nucleotide sequence of yeast mitochondrial isoleucine- and methionine-elongator tRNA have been determined. Interestingly, long stretches of almost identical nucleotide sequence are found within these two tRNAs and also within the yeast mt Formula, suggesting that tbe 3 tRNAs may have arisen from a comon ancestor. Both mt Formula and tRNAIle contain all the structural characteristics which are present in the standard cloverleaf, except that the mt Formula contains an extra unpaired nucleotide within the base-paired T{psi}C stem. This rather unusual feature may an influence on the decoding properties of the C-A-U anticodon of mt Formula by confering the ability to translate not only the codon A-U-G but also A-U-A.


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