The prokaryotic tet operator (tetO) sequence was inserted at positions upstream and downstream of sequences encoding the Arabidopsis thaliana tRNA AUC Lys or tRNA AUC Trp suppressor tRNAs, and tRNA expression in carrot protoplasts was measured by translational suppression of a nonsense codon in a luciferase reporter gene. Regulation of tRNA expression by the tetracycline repressor (tetR) occurred from genes with the tetO inserted at position −1 (for the tRNA AUC Trp gene), or at positions −2, −6 and −10 (for the tRNA AUC Lys gene), and repression reached 90%. The inducer tetracycline (Tc) restored tRNA expression. Similarly, carrot protoplasts transfected with human tRNA AUC Ser genes containing the lac operator (lacO) in their 5′-flanking sequence with or without the lac repressor (lacI) gene, conditionally expressed tRNAs which suppressed the luciferase reporter. Up to 30-fold repression occured by the lactose repressor when lacO was located at position −1 of the tRNA AUC Ser coding sequence. In the presence of the inducer isopropyl-β-thiogalactoside (IPTG), repression was relieved. These results demonstrate that sequences flanking tRNA genes can strongly influence tRNA expression in plants, and in a conditional fashion when bound by inducible proteins.
Plant Molecular Biology – Springer Journals
Published: Sep 30, 2004
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