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PMID: 197518 Published · ppublish English Journal Article

Importance of 5'-terminal blocking structure to stabilize mRNA in eukaryotic protein synthesis.

Shimotohno K, Kodama Y, Hashimoto J, Miura KI

Abstract

The 7-methylguanylic acid residue confronting the 5'-terminal nucleotide of mRNA through two pyrophosphate linkages was completely removed by tobacco pyrophosphatase from mRNAs of cytoplasmic polyhedrosis virus, tobacco mosaic virus (viral RNA), and globin without any scission in the inner part of the RNA chain. Protein synthesis ability in a wheat germ cell-free system was lost after this treatment of all three kinds of mRNA. The initiation complexes for protein synthesis of these three RNAs were not obtained after using tobacco phosphodiesterase-treated mRNA. On incubation of mRNA in a wheat germ extract, the mRNA lacking m7G was quickly degraded from the 5' terminus in an exonucleolytic way, whereas the intact mRNA remained stable. These results show that one of the confronting nucleotide structure's functions is to stabilize the mRNA, to prevent its degradation.

MeSH Terms
Animals Base Sequence Cell-Free System Exonucleases/metabolism Globins/biosynthesis Guanine Nucleotides/metabolism Insect Viruses Peptide Chain Initiation, Translational Phosphoric Diester Hydrolases/metabolism Plants, Toxic Pyrophosphatases/metabolism RNA, Messenger/metabolism RNA, Viral/metabolism Rabbits Structure-Activity Relationship Tobacco/enzymology Tobacco Mosaic Virus Viral Proteins/biosynthesis
Chemicals
Guanine Nucleotides RNA, Messenger RNA, Viral Viral Proteins Globins Exonucleases Phosphoric Diester Hydrolases Pyrophosphatases
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Shimotohno K
Kodama Y
Hashimoto J
Miura K I
References (27)
27 references, click to expand
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1977-07-00
Pages
2734-8
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC431268
Subset
IM
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