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Influence of individual domains of the translation termination factor eRF1 on induction of the GTPase activity of the translation termination factor eRF3

  • Molecular Mechanisms of Biological Processes
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Abstract

Translation termination in eukaryotes is governed by two proteins belonging to class 1 (eRF1) and class 2 (eRF3) polypeptide release factors. eRF3 catalyzes hydrolysis of GTP to yield GDP and Pi in the ribosome in the absence of mRNA, tRNA, aminoacyl-tRNA, and peptidyl-tRNA and requires eRF1 for this activity. It is known that eRF1 and eRF3 interact with each other via their C-terminal regions both in vitro and in vivo. eRF1 consists of three domains—N, M, and C. In this study we examined the influence of the individual domains of the human eRF1 on induction of the human eRF3 GTPase activity in the ribosome in vitro. It was shown that none of the N, M, C, and NM domains induces the eRF3 GTPase activity in the presence of ribosomes. The MC domain does induce the eRF3 GTPase activity, but four times less efficiently than full-length eRF1. Therefore, we assumed that the MC domain (and very likely the M domain) binds to the ribosome in the presence of eRF3. Based on these data and taking into account the data available in the literature, a conclusion was drawn that the N domain of eRF1 is not essential for eRF1-dependent induction of the eRF3 GTPase activity. A working hypothesis is formulated that the eRF3 GTPase activity in the ribosome during translation termination is associated with the intermolecular interactions of GTP/GDP, the GTPase center of the large (60S) subunit, the MC domain of eRF1, and the C-terminal region and GTP-binding motifs of eRF3 but without participation of the N-terminal region of eRF1.

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Authors and Affiliations

  1. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia

    V. I. Dubovaya, P. M. Kolosov, E. Z. Alkalaeva, L. Yu. Frolova & L. L. Kisselev

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  1. V. I. Dubovaya
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  2. P. M. Kolosov
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  3. E. Z. Alkalaeva
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  4. L. Yu. Frolova
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  5. L. L. Kisselev
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Original Russian Text © V.I. Dubovaya, P.M. Kolosov, E.Z. Alkalaeva, L.Yu. Frolova, L.L. Kisselev, 2006, published in Molekulyarnaya Biologiya, 2006, Vol. 40, No. 2, pp. 310–316.

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Dubovaya, V.I., Kolosov, P.M., Alkalaeva, E.Z. et al. Influence of individual domains of the translation termination factor eRF1 on induction of the GTPase activity of the translation termination factor eRF3. Mol Biol 40, 270–275 (2006). https://doi.org/10.1134/S0026893306020130

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  • DOI: https://doi.org/10.1134/S0026893306020130

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