HIV Rev Assembly on the Rev Response Element (RRE): A Structural Perspective.

Area of Science:

• Molecular Biology
• Virology
• Structural Biology

Background:

• Human Immunodeficiency Virus type 1 (HIV-1) replication relies on accessory proteins, including Rev.
• The Rev protein is crucial for the nuclear export of unspliced and singly spliced viral RNA transcripts.
• Rev interacts with the Rev response element (RRE), a structured RNA element within the viral env gene.

Purpose of the Study:

• To review recent advances in understanding the molecular interactions between HIV-1 Rev and the RRE.
• To discuss the structural and biochemical basis of Rev-RNA and Rev-Rev complex formation.
• To explore the implications of these findings for developing novel antiviral therapies targeting HIV-1.

Main Methods:

• X-ray crystallography to determine high-resolution structures of Rev-RRE complexes.
• Small-angle X-ray scattering (SAXS) to study the overall shape and assembly of Rev-RNA complexes.
• Single particle electron microscopy (SPEM) for visualizing complex structures.
• Biochemical and genetic methodologies to probe interaction interfaces and functional consequences.

Main Results:

• Detailed structural insights into the multi-copy assembly of Rev protein onto the structured RRE RNA.
• Elucidation of key Rev-Rev and Rev-RNA interfaces governing complex formation and stability.
• Characterization of the role of cellular cofactor Crm1 in the nuclear export process.

Conclusions:

• Recent structural and biochemical studies have significantly enhanced our understanding of HIV-1 Rev-RRE interactions.
• The detailed molecular mechanisms provide a foundation for designing targeted antiviral strategies.
• Interference with Rev-mediated nuclear export represents a promising avenue for HIV-1 therapeutic development.