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Escherichia coli tRNA Arg was treated with sodium bisulfite to convert exposed cytosine residues to uracil. This treatment resulted in the loss of amino acid acceptance of the tRNA Arg with pseudo first-order reaction kinetics. The active and inactive molecules were separated after about 60e active and inactive molecules were separated after about 60 percent inactivation and analyzed for U in various positions by finger-printing of the oligonucleotides produced by nucleases. The results show that C to U base transitions in the dihydrouridine loop and in the CCA terminus have no effect on the aminoacylation of this tRNA. Deamination of a cytosine residue at the second position of the anticodon resulted in the loss of amino acid acceptor activity of arginine transfer RNA.

Effect of sodium bisulfite modification on the arginine acceptance of E.coli tRNAArg

Effect of sodium bisulfite modification on the arginine acceptance of E.coli tRNA^Arg