Identification of a novel Rev-interacting cellular protein

Area of Science:

• Virology
• Molecular Biology
• Cell Biology

Background:

• Host cell interactions with human immunodeficiency virus (HIV) vary.
• Understanding viral exploitation of cellular functions and innate immune responses is crucial for controlling HIV replication.
• The HIV Rev protein regulates viral gene expression and is a key target for cellular protein interactions.

Purpose of the Study:

• To identify novel cellular factors that modulate the activity of the HIV Rev protein.
• To explore potential therapeutic targets for antiviral drug development.

Main Methods:

• Yeast-two hybrid screening using Rev as bait to identify interacting proteins from a T-cell cDNA library.
• Mammalian two-hybrid assays to confirm Rev-16.4.1 interaction in human cells.
• Colocalization studies to determine the subcellular localization of Rev and 16.4.1.
• Functional assays using reporter gene expression to assess the impact of 16.4.1 on Rev activity.

Main Results:

• A novel human cDNA product, designated 16.4.1, was isolated.
• 16.4.1 exhibits CRM1-mediated nuclear export and interacts with Rev in human cells, localizing to nucleoli.
• Overexpression of 16.4.1 inhibited Rev-dependent reporter gene expression, while siRNA knockdown stimulated it, indicating 16.4.1 modulates Rev activity.

Conclusions:

• The protein 16.4.1 acts as a modulator of HIV Rev activity.
• The identified experimental strategies can be used to discover and characterize additional Rev-interacting cellular factors.