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. 1982 Feb;79(4):1012–1016. doi: 10.1073/pnas.79.4.1012

Relationship between structure of the 5' noncoding region of viral mRNA and efficiency in the initiation step of protein synthesis in a eukaryotic system.

K Yamaguchi, S Hidaka, K Miura
PMCID: PMC345889  PMID: 7041111

Abstract

To determine whether the rate of protein synthesis is controlled by the structure of mRNA near its 5' terminus, protein-synthesizing ability, especially in its initial stage, was compared among RNAs of plant viruses. Those viruses used here contain several definite pieces of single-stranded RNA. Each of these RNAs acts as a messenger. Cucumber mosaic virus (CMV) RNA 5 synthesizes a small amount of a protein, Mr 7000, in an in vitro protein-synthesizing system from wheat germ or reticulocyte. Brome mosaic virus (BMV) RNA 4 synthesizes a large amount of a coat protein under the same conditions. Both RNAs have the same 5'-cap structure and a short noncoding region (10 nucleotides in CMV RNA 5 and 9 in BMV RNA 4) between the 5' terminus and the initiation codon AUG. A sequence complementary to the 3' terminal of 18S ribosomal RNA is contained in BMV RNA 4 but is not apparent in CMV RNA 5. Formation of the initiation complex for protein synthesis by the 5'-terminal-labeled mRNA of cytoplasmic polyhedrosis virus was inhibited by the addition of unlabeled BMV RNA 4 whereas it was only slightly inhibited by unlabeled CMV RNA 5. BMV RNA 4, which has a sequence complementary to rRNA, can form the initiation complex more easily than CMV RNA5. It is concluded that an apparent complementary sequence in the 3' terminal of 18S rRNA in the 5' noncoding region of eukaryotic mRNA and the 5'-cap structure enhance the rate of initiation complex formation in protein synthesis.

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Selected References

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