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Related Experiment Videos

Dependence of interferon induction on nucleic acid conformation.

A M Bobst, P F Torrence, S Kouidou

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1976
    PubMed
    Summary

    Substitutions in nucleic acid duplexes alter their structure and interferon-inducing ability. Specific purine modifications impact base tilt, linking double helix conformation to interferon induction.

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    Synthesis and characterization of chimeric 2-5A-DNA oligonucleotides.

    Current protocols in nucleic acid chemistry·2008

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • Nucleic acid duplexes are crucial for biological processes.
    • Understanding structural modifications is key to function.
    • Interferon induction is a critical immune response.

    Purpose of the Study:

    • To investigate conformational changes in nucleic acid duplexes due to specific chemical substitutions.
    • To correlate these structural changes with interferon-inducing capabilities.

    Main Methods:

    • UV and circular dichroism spectroscopy were used to analyze duplex analogs.
    • Poly(5-bromocytidylic acid) served as a sensor strand for data interpretation.

    Main Results:

    • 5-pyrimidine substitutions (bromine, methyl) showed minimal impact on duplex conformation.

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  • c7 purine substitutions (in poly(7-deazaadenylic acid) and poly(7-deazainosinic acid)) altered base tilt differently.
  • Duplexes with poly(7-deazainosinic acid) were potent interferon inducers, while poly(7-deazaadenylic acid) analogs were inactive.
  • 5-pyrimidine substitutions generally did not affect interferon induction unless thermal stability was compromised.

    • Conclusions:

    • This study establishes a link between specific double helix physical parameters and interferon-inducing ability.
    • Interferon induction is dependent on the spatial and steric organization of double-stranded RNA.