Abstract
Translation termination is a finishing step of protein biosynthesis. The significant role in this process belongs not only to protein factors of translation termination but also to the nearest nucleotide environment of stop codons. There are numerous descriptions of stop codons readthrough, which is due to specific nucleotide sequences behind them. However, represented data are segmental and don’t explain the mechanism of the nucleotide context influence on translation termination. It is well known that stop codon UAA usage is preferential for A/T-rich genes, and UAG, UGA—for G/C-rich genes, which is related to an expression level of these genes. We investigated the connection between a frequency of nucleotides occurrence in 3' area of stop codons in the human genome and their influence on translation termination efficiency. We found that 3' context motif, which is cognate to the sequence of a stop codon, stimulates translation termination. At the same time, the nucleotide composition of 3' sequence that differs from stop codon, decreases translation termination efficiency.
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ACKNOWLEDGMENTS
We would like to thank the staff of CCU Genome for sequencing, Tat’yana Pestova, Christopher Helen, and Lyudmila Yur’evna Frolova for the plasmids provided, as well as the laboratory staff for productive discussion of the results. We also thank former laboratory employees Yuliya Vladimirovna Bocharova and Polina Nikolaevna Kryuchkova for the exceptional contribution to the present work.
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The work was carried out with the support of the Russian Science Foundation (RSF) (grant no. 19-74-10078).
COMPLIANCE WITH ETHICAL STANDARDS
The work did not use animals as subjects of study.
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Sokolova, E.E., Vlasov, P.K., Egorova, T.V. et al. The Influence of A/G Composition of 3' Stop Codon Contexts on Translation Termination Efficiency in Eukaryotes. Mol Biol 54, 739–748 (2020). https://doi.org/10.1134/S0026893320050088
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DOI: https://doi.org/10.1134/S0026893320050088