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Arrangement of the Template 3′ of the A-Site Codon on the Human 80S Ribosome

  • Molecular Mechanisms of Biological Processes
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Abstract

The arrangement of the template sequence 3′ of the A-site codon on the 80S ribosome was studied using mRNA analogs containing Phe codon UUU at the 5′ end and a photoreactive perfluoroarylazido group linked to C5 of U or N7 of G. The analogs were positioned on the ribosome with the use of tRNAPhe, which directed the UUU codon to the P site, bringing a modified nucleotide to position +9 or +12 relative to the first nucleotide of the P-site codon. Upon mild UV irradiation of ribosome complexes, the analogs of both types crosslinked to the 18S rRNA and proteins of the 40S subunit. Comparisons were made with the crosslinking patterns of complexes in which an mRNA analog contained a modified nucleotide in position +7 (the crosslinking to 18S rRNA in such complexes has been studied previously). The efficiency of crosslinking to ribosomal components depended on the nature of the modified nucleotide of an mRNA analog and its position on the ribosome. The extent of crosslinking to the 18S rRNA drastically decreased as the modified nucleotide was transferred from position +7 to position +12. The 18S rRNA nucleotides involved in crosslinking were identified. A modified nucleotide in position +9 crosslinked to the invariant dinucleotide A1824/A1825 and variable A1823 in the 3′ minidomain of the 18S rRNA and to S15. The same ribosomal components have earlier been shown to crosslink to modified nucleotides in positions +4 to +7. In addition, all mRNA analogs crosslinked to invariant C1698 in the 3′ minidomain and to conserved region 605–620, which closes helix 18 in the 5′ domain.

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Authors and Affiliations

  1. Institute of Chemical Biology and Fundamental Medicine, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    M. V. Molotkov, D. M. Graifer, N. A. Demeshkina, M. N. Repkova, A. G. Ven'yaminova & G. G. Karpova

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  1. M. V. Molotkov
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  2. D. M. Graifer
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  3. N. A. Demeshkina
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  4. M. N. Repkova
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  5. A. G. Ven'yaminova
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  6. G. G. Karpova
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__________

Translated from Molekulyarnaya Biologiya, Vol. 39, No. 6, 2005, pp. 999–1007.

Original Russian Text Copyright © 2005 by Molotkov, Graifer, Demeshkina, Repkova, Ven'yaminova, Karpova.

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Molotkov, M.V., Graifer, D.M., Demeshkina, N.A. et al. Arrangement of the Template 3′ of the A-Site Codon on the Human 80S Ribosome. Mol Biol 39, 876–883 (2005). https://doi.org/10.1007/s11008-005-0108-7

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  • DOI: https://doi.org/10.1007/s11008-005-0108-7

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