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- W2030893800 abstract "Derivatives of E.coli tRNAfMet containing single base substitutions at the wobble position of the anticodon have been enzymatically synthesized in vitro. The procedure involves excision of the normal anticodon, CAU, by limited digestion of intact tRNAfMet with RNase A. RNA ligase is then used to join each of four trinucleotides, NAU, to the 5′ half molecule and to subsequently link the 3′and modified 5′ fragments to regenerate the anticodon loop. Synthesis of intact tRNAfMet containing the anticodon CAU by this procedure yields a product which is indistinguishable from native tRNAfMet with respect to its ability to be aminoacylated by E. coli methionyl-tRNA synthetase. Substitution of any other nucleotide at the wobble position of tRNAfMet drastically impairs the ability of the synthetase to recognize the tRNA. Measurement of methionine acceptance in the presence of high concentrations of pure enzyme has established that the rate of aminoacylation of the AAU, GAU and UAU anticodon derivatives of tRNAfMet is four to five orders of magnitude slower than that of the native or synthesized tRNA containing C as the wobble base. In addition, the inactive tRNA derivatives fail to inhibit aminoacylation of normal tRNAfMet, indicating that they bind poorly to the enzyme. These results support a model involving direct interaction between Met-tRNA synthetase and the C in the wobble position during aminocylation of tRNAfMet." @default.
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- W2030893800 date "1983-03-11" @default.
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- W2030893800 title "Base substitutions in the wobble position of the anticodon inhibit aminoacylation of E. colitRNAfMet by E. coli Met-tRNA synthetase" @default.
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- W2030893800 doi "https://doi.org/10.1093/nar/11.5.1439" @default.
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