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Related Experiment Videos

Geminivirus replication origins have a modular organization

E P Fontes1, H J Gladfelter, R L Schaffer

  • 1Department of Biochemistry, North Carolina State University, Raleigh 27695-7622.

The Plant Cell
|March 1, 1994
PubMed
Summary
This summary is machine-generated.

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Geminivirus replication requires specific interactions between viral DNA and proteins. Studies show that while AL1 protein binding sites are crucial, additional elements in the origin are needed for efficient replication.

Area of Science:

  • Molecular Virology
  • Plant Pathology
  • Molecular Biology

Background:

  • Tomato golden mosaic virus (TGMV) and bean golden mosaic virus (BGMV) are bipartite geminiviruses.
  • Viral DNA replication relies on cis-acting sequences and trans-acting factors encoded by the viral A component.
  • Virus-specific interactions are essential for TGMV and BGMV replication.

Purpose of the Study:

  • To investigate the virus-specific interactions governing TGMV and BGMV replication.
  • To elucidate the functional modules of geminivirus replication origins.
  • To determine the role of the AL1 protein and its binding site in origin recognition.

Main Methods:

  • Replication assays in tobacco protoplasts.
  • In vitro binding assays of AL1 proteins to origin DNA.

Related Experiment Videos

  • Site-directed mutagenesis to alter origin sequences.

    • Main Results:

    • BGMV AL1 protein binds specifically to its origin, similar to TGMV AL1.
    • Neither TGMV nor BGMV AL1 proteins bind to heterologous origins.
    • AL1 binding site is necessary but not sufficient for origin activity; additional elements are required for specific recognition.

    Conclusions:

    • Geminivirus replication origins comprise at least three functional modules.
    • These modules include a stem-loop structure, a specific AL1 binding site, and additional elements for trans-acting factor recognition.
    • These findings highlight the complexity of geminivirus replication initiation.