Role of the constant uridine in binding of yeast tRNAPhe anticodon arm to 30S ribosomes

Olke C. Uhlenbeck*, Peggy T. Lowary, Wayne L. Wittenberg

*Corresponding author for this work

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Twenty-two anticodon arm analogues were prepared by joining different tetra penta and hexaribonucleotides to a nine nucleotide fragment of yeast tRNAPhe with T4 RNA ligase. The oligomer with the same sequence as the anticodon arm of tRNAPhe binds poly U programmed 30S ribosomes with affinity similar to intact tRNAPhe. Analogues with an additional nucleotide in the loop bind ribosomes with a weaker affinity whereas analogues with one less nucleotide in the loop do not bind ribosomes at all. Reasonably tight binding of anticodon arms with different nucleotides on the 5' side of the anti-codon suggest that positions 32 and 33 in the tRNAphe sequence are not essential for ribosome binding. However, differences in the binding constants for anticodon arms containing modified uridine residues in the "constant uridine" position suggest that both of the internal "U turn" hydrogen bonds predicted by the X-ray crystal structure are necessary for maximal ribosome binding.

Original languageEnglish (US)
Pages (from-to)3341-3352
Number of pages12
JournalNucleic acids research
Volume10
Issue number11
DOIs
StatePublished - Jun 11 1982

ASJC Scopus subject areas

  • Genetics

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