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Related Experiment Videos

Cytoplasmic ribonucleoprotein complexes containing human LINE-1 protein and RNA

H Hohjoh1, M F Singer

  • 1Laboratory of Biochemistry, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.

The EMBO Journal
|February 1, 1996
PubMed
Summary

The p40 protein, encoded by human LINE-1 (L1Hs) retrotransposon ORF1, forms large cytoplasmic complexes with L1Hs RNA. These complexes, stabilized by protein-protein interactions involving alpha-helical structures, are identified as novel RNA-binding ribonucleoproteins.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The p40 protein is encoded by the first open reading frame (ORF1) of the human LINE-1 (L1Hs) retrotransposon.
  • p40 has been identified in human teratocarcinoma and tumor cell lines.
  • p40 is 338 amino acids long and possesses a leucine zipper motif.

Purpose of the Study:

  • To characterize the properties of the p40 protein in human teratocarcinoma cell lines.
  • To investigate the complex formation and RNA-binding capabilities of p40.

Main Methods:

  • Analysis of p40 in NTera2D1 and 2102Ep cell lines.
  • Cross-linking experiments with recombinant full-length and truncated p40.
  • Ribonuclease treatment to assess complex dissociation.

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Main Results:

  • Most p40 exists in large multimeric cytoplasmic complexes associated with L1Hs RNA.
  • These complexes are dissociated by ribonuclease, indicating RNA involvement.
  • p40 can form large multimers (>250 kDa) through protein-protein interactions, involving its leucine zipper and conserved ORF1 regions.
  • The amino-terminal region is crucial for complex stability.

Conclusions:

  • p40 is a novel RNA-binding protein.
  • The p40 complex is a ribonucleoprotein complex containing L1Hs RNA.
  • Protein-protein interactions, potentially via alpha-helical coiled-coils, are critical for p40 complex formation and stability.