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Related Experiment Videos

A conserved double-stranded RNA-binding domain.

D St Johnston1, N H Brown, J G Gall

  • 1Wellcome/Cancer Research Campaign Institute, Cambridge, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|November 15, 1992
PubMed
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Researchers identified a conserved double-stranded RNA-binding domain (dsRBD) in proteins from Drosophila, Xenopus, and humans. This domain is crucial for binding double-stranded RNA (dsRNA) and has a defined consensus sequence.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Double-stranded RNA (dsRNA) plays critical roles in gene regulation and cellular defense.
  • Proteins interacting with dsRNA are essential for various biological processes.
  • The structural and functional domains responsible for dsRNA binding were not fully characterized.

Purpose of the Study:

  • To identify and characterize the domain responsible for double-stranded RNA binding in specific proteins.
  • To determine the conserved features of this dsRNA-binding domain across different species.
  • To establish a consensus sequence for this domain.

Main Methods:

  • Sequence analysis of Drosophila staufen and Xenopus Xlrbpa proteins.
  • Database searches for homologous domains in other proteins.

Related Experiment Videos

  • Biochemical binding studies to delimit the minimal dsRNA-binding region.
  • Computer-aided analysis to derive a consensus sequence.

    • Main Results:

    • Identified a conserved double-stranded (ds)RNA-binding domain (dsRBD) in staufen and Xlrbpa.
    • Found homologous dsRBDs in human dsRNA-activated inhibitor (DAI), TAR-binding protein, and E. coli RNase III.
    • Delimited the minimal dsRNA-binding region within the staufen and Xlrbpa domains.
    • Derived a consensus sequence defining a 65- to 68-amino acid dsRBD.

    Conclusions:

    • A conserved dsRNA-binding domain (dsRBD) is present in diverse proteins involved in RNA metabolism and regulation.
    • The identified consensus sequence provides a molecular signature for predicting dsRNA-binding proteins.
    • This finding advances the understanding of molecular mechanisms underlying dsRNA recognition and function.