tRNA anticodons with the modified nucleoside 2-methylthio-N6-(4-hydroxyisopentenyl)adenosine distinguish between bases 3' of the codon.

作者: Johanna U. Ericson , Glenn R. Björk

DOI: 10.1016/0022-2836(91)90697-5

关键词:

摘要: The modified nucleoside 2-methylthio-N6-(4-hydroxyisopentenyl)adenosine (ms2io6A) is present immediately to the 3′ side of anticodon (position 37) in tRNAs that read codons starting with uridine and hence include amber (UAG) suppressor tRNAs. We have used strains Salmonella typhimurium differ only their ability synthesize ms2io6A order determine specifically how this influences efficiency suppression two codon contexts differing by which base codon. results show presence not improves but also allows them distinguish between at least bases Thus, reduces intrinsic context sensitivity tRNA counteracts an unfavourable nucleotide on possible codon-anticodon interactions responsible for effect are discussed.

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