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Secondary structures in polyoma DNA.

M Wu, H Manor, N Davidson

    Journal of Virology
    |October 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Electron microscopy revealed three DNA secondary structures in polyoma virus: a hairpin and two loops. These structures are located near splicing sites, suggesting a role in RNA processing for early and late viral messages.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Structural Biology

    Background:

    • Polyoma virus DNA undergoes complex processing to produce various viral messages.
    • Understanding DNA secondary structures is crucial for deciphering gene expression regulation.

    Purpose of the Study:

    • To identify and map secondary structures within polyoma virus DNA.
    • To investigate the potential role of these structures in RNA splicing and message formation.

    Main Methods:

    • Electron microscopy was employed to visualize single strands of polyoma virus DNA.
    • The T4 gene 32 protein technique was used to stabilize DNA secondary structures for imaging.

    Main Results:

    • Three reproducible secondary structures were identified: a hairpin fold-back and two loops (small and large).

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  • The loops are flanked by inverted repeat stems (approx. 40 base pairs), with overlapping stem sequences.
  • The hairpin structure maps to an early message splicing point, while loop stems are near late message splicing sites.

    • Conclusions:

    • The observed DNA secondary structures, including hairpin and loops, are likely involved in the processing of polyoma virus RNA transcripts.
    • These structures may play a critical role in the precise splicing events required for generating functional early and late viral messages.