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Related Experiment Videos

Structure-based design of a dimeric RNA-peptide complex.

D M Campisi1, V Calabro, A D Frankel

  • 1Department of Biochemistry and Biophysics, University of California at San Francisco, San Francisco, CA 94143-0448, USA.

The EMBO Journal
|February 28, 2001
PubMed
Summary
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Dimeric bovine immunodeficiency virus (BIV) Tat peptides bind optimally arranged dimeric RNA targets with high affinity. This dimer-dimer interaction offers a model for enhanced RNA-protein binding specificity and affinity.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Virology

Background:

  • The arginine-rich RNA-binding domain of bovine immunodeficiency virus (BIV) Tat protein is crucial for viral replication.
  • This domain adopts a beta-hairpin conformation when binding to the BIV TAR RNA sequence in the major groove.

Purpose of the Study:

  • To investigate the potential for dimeric BIV Tat peptides to bind dimeric BIV TAR RNA structures with enhanced affinity and specificity.
  • To explore the structural basis of dimer-dimer interactions between BIV Tat and TAR RNA.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) structure determination of BIV Tat.
  • Modeling of dimeric RNA-protein interactions.
  • In vitro binding assays using dimeric RNAs and BIV Tat peptides (monomeric and dimeric).

Related Experiment Videos

  • In vivo transcriptional activation assays using reporter constructs.

    • Main Results:

    • Dimeric BIV Tat peptides demonstrated high-affinity binding to optimally arranged dimeric TAR RNAs in vitro and in vivo.
    • Extending RNA helices in dimeric arrangements reduced peptide binding by limiting major groove accessibility.
    • Mutational analyses of both RNA and peptide components confirmed the modeled dimer-dimer interaction.

    Conclusions:

    • Dimer-dimer interactions between BIV Tat peptides and TAR RNA can significantly enhance binding affinity and specificity.
    • These findings provide a foundation for designing novel RNA-protein interactions with improved binding characteristics.
    • The study highlights the importance of structural arrangement in mediating high-affinity RNA-protein recognition.