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Related Experiment Videos

Is a closing "GA pair" a rule for stable loop-loop RNA complexes?

F Ducongé1, C Di Primo, J J Toulme

  • 1INSERM U386, Institut Fédératif de Recherche Pathologies Infectieuses, Université Victor Segalen, 146 rue Léo Saignat, 33076 Bordeaux cedex, France.

The Journal of Biological Chemistry
|May 10, 2000
PubMed
Summary
This summary is machine-generated.

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Researchers identified RNA hairpin aptamers that bind tightly to the trans-activation-responsive (TAR) RNA of HIV-1. The study highlights the crucial role of the "GA pair" in stabilizing these TAR-RNA aptamer complexes, enhancing their stability significantly.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Virology

Background:

  • RNA hairpin aptamers can be selected for high affinity binding to specific RNA targets.
  • The trans-activation-responsive (TAR) RNA element of human immunodeficiency virus type 1 (HIV-1) is a key target for antiviral strategies.
  • Loop-loop complex formation is a critical interaction for aptamer-target binding.

Purpose of the Study:

  • To identify and characterize RNA hairpin aptamers that bind specifically to the TAR RNA element of HIV-1.
  • To investigate the structural determinants of the stability of the TAR-RNA aptamer complex.
  • To compare the stability of aptamer-bound TAR RNA with other RNA-RNA interactions.

Main Methods:

  • In vitro selection (SELEX) to identify high-affinity aptamers.

Related Experiment Videos

  • Electrophoretic mobility shift assays (EMSA) for preliminary characterization.
  • UV-absorption spectroscopy for thermal denaturation studies.
  • Surface plasmon resonance (SPR) for determining binding kinetics and complex stability.

    • Main Results:

    • High-affinity RNA hairpin aptamers were selected for TAR RNA at physiological magnesium concentrations.
    • The aptamer-TAR RNA complex stability is critically dependent on the aptamer loop closing "GA pair".
    • SPR and thermal denaturation revealed a stability order for loop pairs: GA > AG > GG > GU > AA > GC > UA >> CA, CU, with stability controlled by the off-rate.
    • The GA pair in aptamers confers a 50-fold increased stability to the TAR-RNA complex compared to a rationally designed ligand (TAR*).
    • Replacing a GC pair with a GA pair also stabilizes a related loop-loop complex involved in ColE1 plasmid replication.

    Conclusions:

    • The GA pair is a key determinant for the high stability of TAR-RNA aptamer complexes.
    • This GA pair interaction may be a preferred motif for stable RNA loop-loop interactions.
    • These findings have implications for designing aptamers as antiviral agents targeting HIV-1 RNA and for understanding other RNA-RNA interactions.