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Related Experiment Videos

The precursor complex of Pf3 bacteriophage.

A Casadevall, L A Day

    Virology
    |September 1, 1985
    PubMed
    Summary

    Filamentous bacteriophage infections create precursor complexes. Purification and analysis of the Pf3 complex reveal distinct DNA-protein interactions and structures compared to the mature virus, indicating significant changes during assembly.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Structural Biology

    Background:

    • Filamentous bacteriophage infections involve intracellular precursor complexes.
    • These complexes consist of circular single-stranded DNA and viral-encoded single-stranded DNA binding proteins.
    • Understanding these complexes is crucial for elucidating viral assembly mechanisms.

    Purpose of the Study:

    • To develop a purification protocol for the Pf3 phage precursor complex.
    • To characterize the biophysical properties of the Pf3 precursor complex.
    • To compare the structure and DNA-protein interactions of the precursor complex with the mature Pf3 virion.

    Main Methods:

    • Purification of Pf3 precursor complexes from infected Pseudomonas aeruginosa.
    • Modification of existing protocols for Ff and Pf1 complexes using molecular sieving chromatography.
    • Characterization using turbidity measurements, scanning-transmission electron microscopy, and mass/length ratio determination.

    Main Results:

    • The Pf3 precursor complex has an average contour length of 500 nm, shorter than the mature virus.
    • The mass/length (M/L) ratio of the precursor complex is approximately 19,300 Da/nm, similar to the virion.
    • The precursor protein component exhibits low alpha-helicity (<10%), contrasting with the mature virus (>90%), and a nucleotide/subunit ratio of 6.0.

    Conclusions:

    • The DNA structure within the precursor complex is significantly different from that in the mature virus.
    • Dramatic changes in DNA structure and protein conformation occur during viral assembly.
    • Different DNA-protein interactions and packing arrangements are employed in filamentous virus systems (Pf3, Ff, Pf1).

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