TY  - JOUR
A1  - Dietz, Julia
A1  - Pustowka, Anette
A1  - Kaur, Ajit
A1  - Koch, Joachim
A1  - Mensch, Sarah
A1  - Stein, Stefan
A1  - Grez, Manuel
A1  - Divita, Gilles
A1  - Mély, Yves
A1  - Schwalbe, Harald
A1  - Dietrich, Ursula
T1  - Optimization and antiviral analysis of peptide ligands for the HIV-1 packaging signal PSI
T2  - Retrovirology
N2  - Oral presentations Background: We selected peptide ligands for the HIV-1 packaging signal PSI by screening phage displayed peptide libraries. Peptide ligands were optimized by screening spot synthesis peptide membranes. The aim of this study is the functional characterization of these peptide ligands with respect to inhibition of HIV-1 replication. Methods: Phage displayed peptide libraries were screened with PSI-RNA structures. The Trp-rich peptide motifs were optimized for specific binding on spot synthesis peptide membranes. The best binding peptide was expressed intracellularly in fusion with RFP or linked to a protein transduction domain (PTD) for intracellular delivery. The effects on virion production were analyzed using pseudotyped lentiviral particles. Results: After positive and negative selection rounds, phages binding specifically to PSI-RNA were identified by ELISA. Peptide inserts contained conserved motifs of aromatic amino acids known to be implicated in binding of PSI-RNA by the natural Gag ligand. The filter assay identified HKWPWW as the best binding ligand for PSI-RNA, which is delivered into several cell lines by addition of a PTD. Compared to a control peptide, the HKWPWW peptide inhibited HIV-1 replication as deduced from reduced titers of culture supernatants. As HKWPWW also binds to the TAR-RNA like the natural nucleocapsid PSI-RNA ligand, the effect on Tat-TAR inhibition will also be analyzed. Currently T-cell lines are established which stably express HKWPWW as well as a control peptide, which will be infected with HIV-1 to monitor the ability of HKWPWW to inhibit wild type HIV-1 replication. Conclusion: The selection of a peptide ligand for PSI-RNA able to inhibit HIV-1 replication proves the suitability of the phage display technology for the selection of peptides binding to RNA-structures. This enables the indentification of peptides serving as leads to interfere with additional targets in the HIV-1 replication cycle.
Y1  - 2007
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/1744
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-36582
N1  - © 2006 Dietz et al; licensee BioMed Central Ltd.
VL  - 3
IS  - (Suppl 1):S58
SP  - 1
EP  - 1
PB  - BioMed Central
CY  - London
ER  -