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Functional interactions between papillomavirus E1 and E2 proteins

M Berg1, A Stenlund

  • 1Cold Spring Harbor Laboratory, New York 11724, USA.

Journal of Virology
|May 1, 1997
PubMed
Summary
This summary is machine-generated.

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Papillomavirus DNA replication relies on E1 and E2 proteins. Chimeric proteins reveal E2

Area of Science:

  • Molecular Virology
  • DNA Replication Mechanisms
  • Protein-Protein Interactions

Background:

  • Papillomavirus DNA replication is initiated by the cooperative binding of viral E1 and E2 proteins to the origin of replication (ori).
  • The E1-E2-ori complex formation is crucial for initiating viral DNA synthesis.
  • Understanding the specific domains of E2 involved in E1 interaction is key to elucidating replication mechanisms.

Purpose of the Study:

  • To map the specific domains of the E2 protein responsible for interacting with the E1 protein.
  • To investigate the functional roles of these E1-E2 interactions in papillomavirus DNA replication.
  • To elucidate the mechanism of cooperative binding between E1 and E2 at the origin of replication.

Main Methods:

  • Construction and utilization of chimeric bovine papillomavirus (BPV)/human papillomavirus type 11 (HPV-11) E2 proteins.

Related Experiment Videos

  • Analysis of E1-E2 protein interactions using these chimeric constructs.
  • Assessing the functional impact of identified interactions on DNA replication initiation and cooperativity.

    • Main Results:

    • Both the DNA-binding domain and the transactivation domain of BPV E2 can independently interact with BPV E1.
    • Interaction with the E2 transactivation domain is essential and sufficient for cooperative binding and DNA replication.
    • Interaction with the E2 DNA-binding domain facilitates E1-E2 transactivation domain interaction, particularly when binding sites are adjacent.

    Conclusions:

    • Papillomavirus E1-E2 cooperative binding to the origin involves a novel two-stage mechanism.
    • The E2 transactivation domain interaction with E1 acts as a trigger for subsequent productive interactions.
    • Distinct roles of E2 domains in mediating E1 interaction highlight a sophisticated regulatory process for viral DNA replication.