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Related Experiment Videos

RNA unwinding by eukaryotic initiation factor 4A and nucleotide modification.

A A Thomas1, L van Aalzum, H O Voorma

  • 1Department of Molecular Cell Biology, University of Utrecht, The Netherlands.

Biochemistry International
|June 1, 1992
PubMed
Summary

Protein synthesis initiation involves unwinding RNA, but this process does not convert adenosine to inosine. Studies show purified eukaryotic initiation factors (eIF) do not cause this nucleotide modification.

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Biochemistry

Background:

  • Nuclear helicases unwind double-stranded RNA, potentially modifying adenosine residues to inosine.
  • Protein synthesis initiation requires unwinding of mRNA's 5' untranslated region by eukaryotic initiation factors (eIF) -4A and -4B.

Purpose of the Study:

  • To investigate if unwinding of RNA by eIF-4A and eIF-4B leads to nucleotide modification.
  • To determine if adenosine residues are converted to inosine during mRNA unwinding by these factors.

Main Methods:

  • In vitro synthesis of labeled RNA.
  • Analysis of RNA unwinding products using gel electrophoresis.
  • Nuclease digestion followed by thin-layer chromatography of mononucleotides.

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Main Results:

  • Crude protein fractions unwound duplex RNA and partially converted AMP to IMP.
  • Purified eIF-4A and eIF-4B unwound RNA but did not cause deamination of AMP residues to IMP.
  • The conversion of adenosine to inosine was not observed with purified initiation factors.

Conclusions:

  • Unwinding of RNA by purified eukaryotic initiation factors (eIF) -4A and -4B during the initiation of protein synthesis does not result in the conversion of adenosine to inosine.
  • The observed AMP to IMP conversion with crude fractions suggests impurities, not the core eIFs, are responsible for deamination.