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. 1992 Aug 11;20(15):3911–3917. doi: 10.1093/nar/20.15.3911

The effects of a unique D-loop structure of a minor tRNA(UUALeu) from Streptomyces on its structural stability and amino acid accepting activity.

Y Ueda 1, I Kumagai 1, K Miura 1
PMCID: PMC334066  PMID: 1380690

Abstract

Streptomyces bldA gene, which encodes a tRNA corresponding to a very minor leucine codon, UUA, regulates pleiotropic gene expression which is involved in sporulation and secondary metabolism. The unique structural feature of this tRNA is the lack of GG sequence in dihydrouridine loop (D-loop) that generally is conserved in tRNAs involved in cytoplasmic protein biosynthesis. In order to investigate the relationship between the D-loop structure and the stability and leucine accepting activity of this tRNA, the wild and D-loop mutant tRNA transcripts were constructed with T7 RNA polymerase in vitro. The wild type tRNA(UUALeu) showed the structural stability and leucine accepting activity at physiological temperature for Streptomyces. The E.coli type D-loop mutant, which has a larger loop size and contains a GG doublet, exhibited increased thermostability. The kinetical analyses of the aminoacylation reaction of tRNA(UUALeu) with S.lividans and E.coli leucyl-tRNA synthetase (LeuRS) suggest there is a unique recognition mechanism of Streptomyces LeuRS toward tRNA(UUALeu).

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