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[Small Noncoding 4.5SH and 4.5SI RNAs and Their Binding to Proteins].

K A Tatosyan1, A P Koval1, D A Kramerov1,2

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia.

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Summary

The functions of small noncoding RNAs 4.5SI and 4.5SH in rodents remain elusive. Research suggests protein X may stabilize 4.5SI RNA, impacting its half-life.

Keywords:
4.5S RNALa proteinRNA-binding proteinsrodentssmall noncoding RNA

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Genetics

Background:

  • Small noncoding RNAs, specifically 4.5SI and 4.5SH, are synthesized by RNA polymerase III and widely expressed in rodent tissues.
  • The precise biological functions of these RNAs are not well understood.

Purpose of the Study:

  • To investigate the protein interactions and functional roles of 4.5SI and 4.5SH RNAs in murine-like rodents.
  • To elucidate the structural basis for protein binding and RNA stability.

Main Methods:

  • Crosslinking assays were employed to identify proteins binding to 4.5SI and 4.5SH RNAs.
  • Immunoprecipitation was used to confirm the association of these RNAs with the La protein.
  • RNA sequence modifications were performed to assess their impact on protein binding and RNA structure.

Main Results:

  • Approximately 50% of 4.5SI and 4.5SH RNA molecules were found to be bound by proteins provisionally named X and Y, respectively.
  • Both RNAs were associated with the La protein, although it did not crosslink to them.
  • The duplex stem at the termini of 4.5SI RNA contributes to its stability compared to 4.5SH RNA.
  • Modifying the 5'-end sequence of 4.5SI RNA disrupted protein binding, but restoring the complementary 3'-end sequence re-established both stem structure and binding to protein X.

Conclusions:

  • Protein X is presumed to play a role in enhancing the half-life of 4.5SI RNA.
  • The structural integrity of 4.5SI RNA, particularly its terminal stem, is crucial for its interaction with protein X and likely influences its stability.