Reference: Piekna-Przybylska D, et al. (2008) Ribosome Performance Is Enhanced by a Rich Cluster of Pseudouridines in the A-site Finger Region of the Large Subunit. J Biol Chem 283(38):26026-36

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Abstract


The large subunit rRNA in eukaryotes contains an unusually dense cluster of 8-10 pseudouridine () modifications located in a three-helix structure (H37-39) implicated in several functions. This region is dominated by a long flexible helix (H38) known as the 'A-site finger' (ASF). The ASF protrudes from the large subunit just above the A-site of tRNA binding, interacts with 5S rRNA and tRNA, and through the terminal loop, forms a bridge (B1a) with the small subunit. In yeast, the three-helix domain contains 10 s and six are concentrated in the ASF helix (three of the ASF s are conserved among eukaryotes). Here, we show by genetic depletion analysis that the s in the ASF helix and adjoining helices are not crucial for cell viability; however their presence notably enhances ribosome fitness. Depleting different combinations of s suggest that the modification pattern is important and revealed that loss of multiple s negatively influences ribosome performance. The effects observed include slower cell growth (reduced rates up to 23% at 30 degrees C, and 40-50% at 37 degrees C and 11 degrees C), reduced level of the large subunit (up to 17%), impaired polysome formation (appearance of half-mers), reduced translation activity (up to 20% at 30 degrees C, and 25% at 11 degrees C), and increased sensitivity to ribosome-based drugs. The results indicate that the s in the three-helix region improve fitness of a eukaryotic ribosome.

Reference Type
Journal Article
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Piekna-Przybylska D, Przybylski P, Baudin-Baillieu A, Rousset JP, Fournier MJ
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