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Modeling and solution structure probing of the HIV-1 TAR stem-loop
A D Critchley1, I Haneef, D J Cousens
1Department of Genetics, University of Leeds, UK.
Journal of Molecular Graphics
|June 1, 1993
Summary
We modeled the HIV TAR stem-loop structure using tRNA data and experimental probing. The findings reveal its unique loop and bulge structures, aiding in understanding Tat protein interactions and designing anti-AIDS drugs.
Area of Science:
- Molecular Biology
- Structural Biology
- Virology
Background:
- The Human Immunodeficiency Virus (HIV) TAR (Trans-Activator Response) element is crucial for viral gene expression.
- Understanding the three-dimensional structure of TAR is essential for developing therapeutic strategies against HIV.
- The TAR element interacts with the viral Tat protein to regulate transcription.
Purpose of the Study:
- To develop and validate a three-dimensional structural model of the HIV TAR stem-loop.
- To investigate the structural features of the TAR loop and bulge regions.
- To provide insights into the interaction between TAR and the Tat protein.
Main Methods:
- Utilized a modeling algorithm based on known transfer RNA (tRNA) X-ray coordinates.
- Employed enzymatic and chemical structure probing of ribo-oligonucleotides containing the TAR sequence.
- Experimentally tested the generated model structure in solution.
Main Results:
- The model suggested a TAR structure similar to the anti-codon loop of tRNA(Asp).
- Identified a loop with three single-stranded residues and a mismatched adenine.
- Revealed an unusual structure in the 5' uridine-rich bulge, a key binding site for Tat protein.
Conclusions:
- The study provides a validated model for the HIV TAR stem-loop structure.
- Structural insights into the TAR loop and bulge may elucidate Tat-TAR interactions.
- This research could facilitate the design of novel anti-AIDS drugs targeting viral transcription.