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Binding of a cyclic BIV beta-Tat peptide with its TAR RNA construct
J B Tok1, R C Des Jean, J Fenker
1Department of Chemistry, Indiana University-Purdue University, Fort Wayne, 46805, USA. tokj@ipfw.edu
Bioorganic & Medicinal Chemistry Letters
|January 5, 2001
Summary
Researchers enhanced RNA-protein binding affinity by converting a peptide into a cyclopeptide. This modified structure showed a 5-fold increase in binding to the bovine immuno-deficiency virus TAR RNA target.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- RNA molecules form complex tertiary structures enabling specific RNA-protein interactions.
- Bovine immuno-deficiency virus (BIV) Tat peptide (17 residues) binds to the BIV TAR RNA construct.
- HIV Rev peptide is a close relative to BIV Tat peptide.
Purpose of the Study:
- To investigate the effect of peptide cyclization on RNA-binding affinity.
- To enhance the binding interaction between a BIV Tat peptide analog and BIV TAR RNA.
Main Methods:
- Synthesis of a 19-residue cyclopeptide from a 17-residue beta-ribbon peptide.
- Fluorescence binding studies to determine binding affinity (Kd).
Main Results:
- The 19-residue cyclopeptide exhibited approximately 5-fold enhanced binding affinity to the BIV TAR RNA target compared to the original peptide.
- Cyclization of the peptide structure significantly improved its interaction with the RNA.
Conclusions:
- Peptide cyclization is a viable strategy to enhance RNA-binding affinity.
- The modified cyclopeptide demonstrates improved potential for targeting specific RNA structures.