γ-AApeptides bind to RNA by mimicking RNA-binding proteins

Area of Science:

• Molecular Biology
• Virology
• Biochemistry

Background:

• Protein-RNA interactions are crucial for cellular functions like transcription, RNA processing, translation, and viral replication.
• The human immunodeficiency virus type 1 (HIV-1) Tat protein plays a key role in viral gene expression through its interaction with the TAR RNA element.

Purpose of the Study:

• To develop a peptidomimetic capable of interacting with viral RNA structures.
• To investigate the potential of γ-AApeptides as mimics of protein-RNA interactions.

Main Methods:

• Design and synthesis of a γ-AApeptide engineered to mimic the RNA-binding properties of HIV-1 Tat.
• Assessment of the binding affinity of the γ-AApeptide to TAR RNAs from HIV and Bovine immunodeficiency virus (BIV).
• Evaluation of the binding interaction's stability in the presence of competing RNA molecules like tRNA.

Main Results:

• The synthesized γ-AApeptide demonstrated nanomolar binding affinity to HIV and BIV TAR RNAs.
• This affinity is comparable to the natural RNA-binding domain of the HIV-1 Tat protein.
• The observed RNA-binding interaction remained robust even when challenged with a significant excess of tRNA.

Conclusions:

• γ-AApeptides can effectively mimic the RNA-binding capabilities of viral proteins like HIV-1 Tat.
• These peptidomimetics exhibit stability against proteolytic degradation and offer extensive possibilities for modification.
• γ-AApeptides represent a promising new class of molecules for modulating critical RNA-protein interactions in various biological contexts, including viral infections.