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Related Experiment Videos

Mapping functional domains in AcMNPV pp31

D R Broussard1, L A Guarino, D L Jarvis

  • 1Departments of Entomology and Biology, Texas A&M University, College Station 77843, USA.

Virology
|August 15, 1996
PubMed
Summary
This summary is machine-generated.

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Autographa californica nuclear polyhedrosis virus (AcMNPV) phosphoprotein pp31

Area of Science:

  • Molecular Virology
  • Insect Cell Biology
  • Viral Replication Mechanisms

Background:

  • Autographa californica nuclear polyhedrosis virus (AcMNPV) replicates within the insect cell nucleus.
  • A viral-modified nuclear matrix, the virogenic stroma, serves as the site for viral DNA packaging, assembly, replication, and transcription.
  • The AcMNPV phosphoprotein pp31 is found in the nucleus and virogenic stroma, possesses DNA binding activity, and functions as a late expression factor.

Purpose of the Study:

  • To map the specific domains of the AcMNPV pp31 protein responsible for its nuclear localization, virogenic stroma targeting, and DNA binding.
  • To elucidate the functional roles of basic regions (BRs) within the pp31 protein during viral infection.

Main Methods:

  • Site-directed mutagenesis was employed to alter specific basic regions (BRs 1-4) within the pp31 gene.

Related Experiment Videos

  • Gene fusion techniques were utilized to track the localization of modified pp31 proteins within insect cells.
  • Analysis of pp31 localization in both uninfected and AcMNPV-infected insect cells was performed.

    • Main Results:

    • The amino-terminal basic region (BR1) is crucial for pp31 nuclear localization in uninfected cells.
    • Efficient localization to the nucleus and virogenic stroma in infected cells requires three of the four basic regions.
    • Basic region 3 (BR3) was identified as the specific DNA binding domain of pp31.

    Conclusions:

    • The study identifies key functional domains within AcMNPV pp31.
    • BR1, BR3, and BR4 are essential for pp31's localization and DNA binding activities.
    • These findings contribute to understanding pp31's role in AcMNPV replication within the virogenic stroma.