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Temperature dependent structural changes of intraphage T7 DNA

A Fekete, G Rontó, L A Feigin

    Biophysics of Structure and Mechanism
    |January 1, 1982
    PubMed
    Summary
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    T7 phage undergoes a structural transition between 40-65°C, releasing its protein coat and altering DNA packing. This impacts optical properties, scattering, and biological activity.

    Area of Science:

    • Biophysics
    • Molecular Biology
    • Virology

    Background:

    • T7 phage is a well-characterized bacteriophage used as a model system.
    • Understanding phage structural transitions is crucial for molecular biology and virology.

    Purpose of the Study:

    • To investigate the initial phase transition of T7 phage.
    • To characterize structural and functional changes occurring within a specific temperature range.

    Main Methods:

    • Optical melting curve analysis
    • Small-angle X-ray scattering (SAXS)
    • Spectroscopic analysis
    • Biological activity assays

    Main Results:

    • Observed a decrease in optical absorption.

    Related Experiment Videos

  • Noted the disappearance of DNA packing maxima in SAXS.
  • Documented a drop in biological activity.
  • Detected structural changes in absorption spectra.

    • Conclusions:

    • The data suggest DNA structural changes due to protein coat release during the phase transition.
    • Intraphage DNA packing is disrupted above 65°C, resembling DNA in solution.