Recognition of Yeast tRNAPhe by Its Cognate Yeast Phenylalanyl-tRNA Synthetase: An Analysis of Specificity1

Jeffrey R. Sampson, Linda S. Behlen, Anthony B. DiRenzo, Olke C. Uhlenbeck*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


A kinetic analysis of aminoacylation of mutant yeast tRNAphe transcripts by its cognate yeast phenylalanyl-tRNA synthetase (FRS) reveals five nucleotides in tRNAPhe as major recognition sites for FRS. The aminoacylation kinetics for two double mutants suggest that each of the five recognition sites contributes independently to kcat/KM. Measured kinetic values for the mutants presented here and those reported previously were then used to calculate the predicted cat/KM. of misacylation for a number of noncognate tRNAs. The predicted cat/KM. values are consistent with values measured by other investigators and thus support the five-nucleotide recognition model. The cat/KM. of misacylation for all known yeast tRNAs has been calculated on the basis of this model, and the specificity of FRS for tRNAPhe in yeast is discussed.

Original languageEnglish (US)
Pages (from-to)4161-4167
Number of pages7
Issue number17
StatePublished - 1992

ASJC Scopus subject areas

  • Biochemistry

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