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. 1993 Sep;13(9):5331–5347. doi: 10.1128/mcb.13.9.5331

A phylogenetically conserved sequence within viral 3' untranslated RNA pseudoknots regulates translation.

V Leathers 1, R Tanguay 1, M Kobayashi 1, D R Gallie 1
PMCID: PMC360232  PMID: 8355685

Abstract

Both the 68-base 5' leader (omega) and the 205-base 3' untranslated region (UTR) of tobacco mosaic virus (TMV) promote efficient translation. A 35-base region within omega is necessary and sufficient for the regulation. Within the 3' UTR, a 52-base region, composed of two RNA pseudoknots, is required for regulation. These pseudoknots are phylogenetically conserved among seven viruses from two different viral groups and one satellite virus. The pseudoknots contained significant conservation at the secondary and tertiary levels and at several positions at the primary sequence level. Mutational analysis of the sequences determined that the primary sequence in several conserved positions, particularly within the third pseudoknot, was essential for function. The higher-order structure of the pseudoknots was also required. Both the leader and the pseudoknot region were specifically recognized by, and competed for, the same proteins in extracts made from carrot cell suspension cells and wheat germ. Binding of the proteins is much stronger to omega than the pseudoknot region. Synergism was observed between the TMV 3' UTR and the cap and to a lesser extent between omega and the 3' UTR. The functional synergism and the protein binding data suggest that the cap, TMV 5' leader, and 3' UTR interact to establish an efficient level of translation.

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Selected References

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