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Biochimie. 1995;77(1-2):66-74.

Aminoacylation of transfer RNAs with 2-thiouridine derivatives in the wobble position of the anticodon.

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  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520-8114, USA.


The first position or 'wobble base' in the anticodon of tRNAs is frequently the site of post-transcriptional modification. In Escherichia coli, glutamine, glutamate, and lysine tRNAs contain 2-thiouridine derivatives in this position, and the significance of these modifications has been under investigation since their discovery. Here we describe the investigations to link 2-thiouridine derivatives to aminoacylation of these tRNAs. The implications of these findings on the evolution of specificity of aminoacyl-tRNA synthetases and on translational regulation are also discussed.

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