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Active Suppressor tRNAs with a Double Helix between the D- and T-loops

Journal of Molecular Biology
Publication Date
DOI: 10.1016/j.jmb.2007.07.058
  • L-Shape
  • Molecular Modelling
  • Selectionin Vivo
  • T-Loop
  • Trna


Abstract One of the most conserved elements of the tRNA structure is the reverse-Hoogsteen base-pair T54–A58 in the T-loop, which plays a major role in the maintenance of the standard L-shape conformation. Here, we present the results of in vivo selection of 51 active suppressor tRNA clones, none of which contains base-pair T54–A58. In 49 clones, we found two regions in the D and T-loops that are complementary to each other. This finding suggests the existence of an inter-loop double helix consisting of three base-pairs, which could have the same role as base-pair T54–A58 in the fixation of the juxtaposition of the two helical domains within the L-shape. From this point of view, the appearance of the inter-loop double helix represents a compensatory effect for the absence of base-pair T54–A58. The results shed new light on the role of different elements of the tRNA structure in the formation of the standard L-shape conformation and on the possibility of synonymous replacements of one arrangement by another in functional RNA molecules.

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