A structurally modified yeast tRNAPhe with six nucleotides in the anticodon loop lacks significant phenylalanine acceptance.

K. Nishikawa, S. M. Hecht

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The deletion of nucleoside 37 from yeast tRNAPhe was accomplished in a three-step procedure that involved (i) specific depurination of this purine under acidic conditions and removal of the carbohydrate moiety with aniline-2-aminopyridine, (ii) removal of phosphate monoesters from the 5'-half-molecule with alkaline phosphatase, and (iii) resealing of the anticodon loop with T4 RNA ligase. The course of the resealing reaction was monitored by polyacrylamide gel electrophoresis and found to be complete within a few hours when incubated at 37 degrees C in the presence of 215 units/ml of RNA ligase. Although the half-molecules used to prepare the modified tRNA had substantial phenylalanine acceptance when assayed at low ionic strength, the modified species itself was essentially devoid of phenylalanine acceptance. We conclude that the anticodon loop of tRNAPhe is involved in the activation of this tRNA and that both the presence of specific nucleotides in this loop and their ability to assume an appropriate spatial or conformational arrangement may be important for enzyme recognition.

Original languageEnglish (US)
Pages (from-to)10536-10539
Number of pages4
JournalJournal of Biological Chemistry
Volume257
Issue number18
StatePublished - Sep 25 1982
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'A structurally modified yeast tRNAPhe with six nucleotides in the anticodon loop lacks significant phenylalanine acceptance.'. Together they form a unique fingerprint.

  • Cite this