Transcription factor PRDII-BF1 activates human immunodeficiency virus type 1 gene expression

Area of Science:

• Molecular Biology
• Virology
• Gene Regulation

Background:

• Human immunodeficiency virus (HIV) gene expression is regulated by cellular transcription factors binding to the HIV-1 long terminal repeat (LTR).
• The NF-kappa B family and other transcription factors, including zinc finger proteins, bind to critical regulatory regions within the HIV-1 LTR.

Purpose of the Study:

• To investigate the role of the zinc finger DNA-binding protein PRDII-BF1 (also known as MBP-1) in modulating HIV-1 gene expression.
• To determine if PRDII-BF1 binds to regulatory elements in the HIV-1 LTR and affects viral gene transcription.

Main Methods:

• DNase I footprinting to identify PRDII-BF1 binding sites on the HIV-1 LTR.
• In vitro translation and vaccinia virus expression to produce full-length PRDII-BF1 protein.
• Transfection experiments using expression vectors and antisense constructs to assess PRDII-BF1's effect on HIV-1 gene expression.

Main Results:

• PRDII-BF1 was shown to bind to both NF-kappa B and TAR (transactivation response) DNA elements within the HIV-1 LTR.
• Expression of full-length PRDII-BF1 protein was confirmed through in vitro and vaccinia virus systems.
• Transfection studies demonstrated that PRDII-BF1 activates HIV-1 gene expression, irrespective of the presence of the viral tat protein.

Conclusions:

• PRDII-BF1 plays a significant role in activating HIV-1 gene expression.
• The findings suggest PRDII-BF1 is a cellular factor that can enhance viral transcription through direct interaction with the HIV-1 LTR.