Specific replacement of functional groups of uridine-33 in yeast phenylalanine transfer ribonucleic acid. Journal Article uri icon



  • Functional groups of the highly conserved uridine at position 33 in the anticodon loop of yeast tRNAPhe were altered by a synthetic protocol that replaces U-33 with any desired nucleotide and leaves all other nucleotides of the tRNA intact. The U-33-substituted tRNAs were prepared in an eight-step protocol that begins with partial cleavage of tRNAPhe at U-33 by ribonuclease A. By use of the combined half-molecules as substrate, U-33 was removed from the 5' half-molecule in three steps and then replaced by using RNA ligase to add the desired nucleoside 3',5'-bisphosphate. Each position 33 substituted 5' half-molecule was isolated and annealed to the original 3' half-molecule from the ribonuclease A digestion. The two halves were then rejoined in three steps to give a full-size tRNAPhe variant. This protocol should be applicable to other RNA molecules where a nucleotide substitution is desired at the 5' side of an available unique cleavage site. Seven substituted tRNAPheS containing uridine, pseudouridine, 3-methyluridine, 2'-O-methyluridine, cytidine, deoxycytidine, and purine riboside at position 33 were assayed for aminoacylation with yeast phenylalanyl-tRNA synthetase. Each of the seven tRNAs aminoacylated normally. Thus, unlike the adjacent guanine residue at position 34, U-33 is not involved in the interaction between yeast tRNAPhe and yeast phenylalanyl-tRNA synthetase.

publication date

  • May 21, 1985

has subject area

has restriction

  • closed

Date in CU Experts

  • March 13, 2015 12:57 PM

Full Author List

  • Wittenberg WL; Uhlenbeck OC

author count

  • 2

Other Profiles

International Standard Serial Number (ISSN)

  • 0006-2960

Additional Document Info

start page

  • 2705

end page

  • 2712


  • 24


  • 11