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XB-ART-29179
Eur J Biochem 1985 Jun 18;1493:549-56.
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Biochemical research on oogenesis. Aminoacyl tRNA turns over in the 42-S particles of Xenopus laevis oocytes, but its ester bond is protected against hydrolysis.

Denis H, le Maire M.


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The ester bond aminoacyl tRNA is protected against hydrolysis in the 42-S particles (thesaurisomes) present in Xenopus laevis previtellogenic oocytes. Deacylation of tRNA is very slow in vitro, unless ATP is present. ATP causes a partial turnover of aminoacyl tRNA in vitro, with no detectable decrease in the overall aminoacylation level of tRNA, which remains close to 100%. tRNA in the particles turns over rapidly in vivo. Since the ester bond of aminoacyl tRNA is stabilized inside the 42-S particles, this turnover cannot be a consequence of spontaneous deacylation of tRNA, followed by reacylation by the aminoacyl-tRNA synthetases associated with the particles. We rather consider this turnover as reflecting a true metabolic activity of the particles, and a direct or indirect involvement of these particles in the oocyte's protein-synthesizing system.

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Genes referenced: mt-tr trna