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Related Experiment Videos

Hepadnavirus assembly and reverse transcription require a multi-component chaperone complex which is incorporated

J Hu1, D O Toft, C Seeger

  • 1Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, PA 19111, USA.

The EMBO Journal
|January 2, 1997
PubMed
Summary

Hepadnavirus assembly requires heat shock protein 90 (Hsp90) and p23 chaperone proteins. This energy-dependent process, involving ATP hydrolysis, ensures the viral polymerase is correctly configured for DNA synthesis and packaging.

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Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Hepadnavirus assembly involves forming a ribonucleoprotein (RNP) complex.
  • This complex includes the viral polymerase and epsilon RNA, essential for reverse transcription.
  • Previous work identified heat shock protein 90 (Hsp90) as a cellular factor in RNP formation.

Purpose of the Study:

  • To investigate the role of ATP hydrolysis and p23 in hepadnavirus RNP complex formation.
  • To determine if the chaperone complex is incorporated into viral nucleocapsids.
  • To propose a model for hepadnavirus assembly and DNA synthesis priming.

Main Methods:

  • Studied duck hepatitis B virus (DHBV) RNP formation.
  • Investigated the requirement for ATP hydrolysis and p23.

Related Experiment Videos

  • Examined chaperone complex incorporation into nucleocapsids.
  • Utilized polymerase-dependent reactions.

    • Main Results:

    • RNP formation requires ATP hydrolysis and the chaperone partner p23.
    • The Hsp90/p23 chaperone complex is incorporated into viral nucleocapsids.
    • This incorporation is dependent on the viral polymerase.

    Conclusions:

    • A dynamic, energy-driven process mediated by Hsp90 and p23 is crucial for hepadnavirus assembly.
    • The chaperone complex maintains the viral reverse transcriptase in a conformation ready for RNA packaging and DNA synthesis priming.
    • This provides a model for hepadnavirus replication initiation.