Discovery and Optimization of a Natural HIV-1 Entry Inhibitor Targeting the gp41 Fusion Peptide

Jan Münch, Ludger Ständker, Knut Adermann, Axel Schulz, Michael Schindler, Raghavan Chinnadurai, Stefan Pöhlmann, Chawaree Chaipan, Thorsten Biet, Thomas Peters, Bernd Meyer, Dennis Wilhelm, Hong Lu, Weiguo Jing, Shibo Jiang, Wolf Georg Forssmann*, Frank Kirchhoff

*Corresponding author for this work
241 Citations (Scopus)

Abstract

A variety of molecules in human blood have been implicated in the inhibition of HIV-1. However, it remained elusive which circulating natural compounds are most effective in controlling viral replication in vivo. To identify natural HIV-1 inhibitors we screened a comprehensive peptide library generated from human hemofiltrate. The most potent fraction contained a 20-residue peptide, designated VIRUS-INHIBITORY PEPTIDE (VIRIP), corresponding to the C-proximal region of α1-antitrypsin, the most abundant circulating serine protease inhibitor. We found that VIRIP inhibits a wide variety of HIV-1 strains including those resistant to current antiretroviral drugs. Further analysis demonstrated that VIRIP blocks HIV-1 entry by interacting with the gp41 fusion peptide and showed that a few amino acid changes increase its antiretroviral potency by two orders of magnitude. Thus, as a highly specific natural inhibitor of the HIV-1 gp41 fusion peptide, VIRIP may lead to the development of another class of antiretroviral drugs.

Original languageEnglish
JournalCell
Volume129
Issue number2
Pages (from-to)263-275
Number of pages13
ISSN0092-8674
DOIs
Publication statusPublished - 20.04.2007

Funding

We thank Bernhard Fleckenstein and Thomas Mertens for support; Veronica L. Kuhlemann, Ulrich Schubert, and Ingrid Bennett for critical reading of the manuscript; Ilka Uhrland, Jessika Babierowski, Nadja Auer, Nicola Bailer, Daniela Krnavek, and Louise Boyer-Chatenet for their excellent technical assistance; Alexander Steinkasserer and Jutta Eisemann for dendritic cells; Gerhard Rettinger, Herbert Riechelmann, Tilmann Keck, and Kai Johannes Lorenz for providing tonsils; Oliver Hartley for PSC-RANTES; Thomas Grunwald for his RSV studies; Harry John for bioanalytical support of VIRIP peptides; Peter Henklein for the synthesis of some fusion peptides; and Gabrielle Sass for helpful discussion. A number of reagents were obtained through the NIH AIDS Reagent Program. B.M. and T.P. acknowledge the grant (DFG ME1830/1) for the 700 MHz spectrometer. This work was supported by the government of Lower Saxony and by grants from the DFG and the Wilhelm-Sander Foundation and NIH grant 1R01AI067057-01A2 to F.K. W.-G.F. is founder and shareholder and L.S. is shareholder of Pharis Pharma Holding GmbH & Co. KG, the parent company of VIRO Pharmaceuticals GmbH & Co. KG. K.A. is Managing Scientific Director of VIRO Pharmaceuticals GmbH & Co. KG. The remaining authors have no financial interest related to this work.

Research Areas and Centers

  • Academic Focus: Center for Infection and Inflammation Research (ZIEL)

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