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Related Experiment Videos

An efficient rapid system for assaying HBx-mediated transactivation.

Xiaoling Zhou1,2,3, Haijun Shi1,2,3, Shaozhe Yang1,2,3

  • 1Stem Cell P2 Laboratory, Shantou University Medical College, Shantou, 515041, People's Republic of China.

Biotechnology Letters
|April 8, 2017
PubMed
Summary

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A new GFP reporter assay effectively measures the transactivation ability of hepatitis B virus X protein (HBx). This rapid and accurate system aids in screening for HBx inhibitors and enhancers, crucial for understanding viral replication.

Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Hepatitis B virus X protein (HBx) plays a critical role in viral replication by transactivating cellular promoters.
  • Existing assay systems for HBx transactivation may lack speed or accuracy.
  • Developing a robust screening platform is essential for identifying therapeutic targets.

Purpose of the Study:

  • To establish a novel, rapid, and accurate reporter assay for screening agents targeting HBx transactivation.
  • To characterize the performance of this new assay system using known HBx regulators.

Main Methods:

  • A Green Fluorescent Protein (GFP)-based reporter system was constructed using plasmids expressing HBx-FLAG and linked to EGFP via an internal ribosome entry site.
  • Transactivation by HBx was quantified using fluorescence microscopy, quantitative PCR (qPCR), and flow cytometry.
Keywords:
Cytomegalovirus promoterGFPHBx geneHepatitus B virus X proteinTransactivationVirus X protein

Related Experiment Videos

  • The assay's efficacy was validated by testing known HBx regulators (DDB1, ID1, P53) and modeling repressor function in Hep3B cells.

    • Main Results:

    • The GFP reporter system successfully demonstrated and quantified the transactivation effect of HBx on the cytomegalovirus (CMV) promoter.
    • Flow cytometry provided a quantitative measure of HBx transactivation ability.
    • The assay accurately reflected changes in GFP levels in response to known HBx regulators, confirming its reliability.

    Conclusions:

    • The developed GFP-based reporter system offers a rapid and accurate method for analyzing the transactivation capability of HBx.
    • This assay is a valuable tool for screening potential inhibitors or enhancers of HBx activity.
    • The system facilitates further research into HBx function and its role in hepatitis B virus pathogenesis.