Nucleic Acids Research, 1985, Vol. 13, No. 15 5697-5706
© 1985
Articles |
Nucleotide sequences of two serine tRNAs with a GGA anticodon: the structure-function relationships in the serine family of E. coli tRNAs
Département de Biochimie, Université de Montréal Montréal, Québec H3C 3J7, Canada 1Département de Biologie Moléculaire, Université Libre de Bruxelles B-1640 Rhode-St-Genèse, Belgique 2Department of Molecular Biology and Biophysics, Yale University New Haven, CT, USA
Received April 29, 1985. Revised July 22, 1985. Accepted July 22, 1985.
We have determined the nucleotide sequence of the major species of E.colitRNASer and of a minor species having the same GGA anticodon. These two tRNAs should recognize the UCC and UCU codons, the most widely used codons for serine in the highly expressed genes of E.coli. The two sequences differ in only one position of the D-loop. Neither tRNA has a modified adenosine in the position 3'-adjacent to the anticodon. This can be rationalized on the basis of a structural constraint in the anticodon stem and may be related to optimization of the codon-anticodon interaction. Conparison of all E.coli serine tRNAs (and that encoded by bacteriophage T4) reveals characteristic (possibly functional) features. Evolutionary analysis suggests an eubacterial origin of the T4tRNASer gene and the existences of a recent common ancestor for the
and
genes.
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