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The structure, phylogeny and in vivo function of the base pair formed between nucleotides 32 and 38 of the tRNA anticodon loop are reviewed. The A32–U38 pair, which is highly conserved in tRNA 2Ala and sometimes observed in tRNA 2Pro , was recently found to decrease the affinity of tRNAs to the ribosomal A site relative to other 32–38 combinations. This suggests that the...
The role of 2′ hydroxyl groups in the codon–anticodon helix was evaluated by introducing single deoxynucleotides into each of the six positions in the helix and measuring the affinity of tRNA to either the A site or the P site of Escherichia coli 70S ribosomes. In perfect agreement with the X-ray structure of the Thermus thermophilus 30S subunit, A site binding was weaker in five of the six positions...
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