Vectofusin-1, a potent peptidic enhancer of viral gene transfer forms pH-dependent α-helical nanofibrils, concentrating viral particles

Louic Vermeer; Loic Hamon; Alicia Schirer; Michel Schoup; Jérémie Cosette; Saliha Majdoul; David Pastre; Daniel Stockholm; Nathalie Holic; Petra Hellwig; Anne Galy; David Fenard; Burkhard Bechinger

Vectofusin-1, a potent peptidic enhancer of viral gene transfer forms pH-dependent α-helical nanofibrils, concentrating viral particles

Louic Vermeer ¹ Loic Hamon ² Alicia Schirer ³ Michel Schoup ¹ Jérémie Cosette ⁴ Saliha Majdoul ⁵ David Pastre ² Daniel Stockholm ⁵ Nathalie Holic ⁵ Petra Hellwig ³ Anne Galy ⁵ David Fenard ⁶ Burkhard Bechinger ¹

1 Institut de Chimie de Strasbourg

2 SABNP - Structure et activité des biomolécules normales et pathologiques

3 CMC - Chimie de la matière complexe

4 Généthon, Evry

5 Immunologie moléculaire et biothérapies innovantes

6 Genethon - Inserm UMR_S951

Immunologie moléculaire et biothérapies innovantes, Généthon

Abstract : Gene transfer using lentiviral vectors has therapeutic applications spanning from monogenic and infectious diseases to cancer. Such gene therapy has to be improved by enhancing the levels of viral infection of target cells and/or reducing the amount of lentivirus for greater safety and reduced costs. Vectofusin-1, a recently developed cationic amphipathic peptide with a pronounced capacity to enhance such viral transduction, strongly promotes the entry of several retroviral pseudotypes into target cells when added to the culture medium. To clarify the molecular basis of its action the peptide was investigated on a molecular and a supramolecular level by a variety of biophysical approaches. We show that in culture medium vectofusin-1 rapidly forms complexes in the 10 nm range that further assemble into annular and extended nanofibrils. These associate with viral particles allowing them to be easily pelleted for optimal virus-cell interaction. Thioflavin T fluorescence, circular dichroism and infrared spectroscopies indicate that these fibrils have a unique α-helical structure whereas most other viral transduction enhancers form β-amyloid fibrils. A vectofusin-1 derivative (LAH2-A4) is inefficient in biological assays and does not form nanofibrils, suggesting that supramolecular assembly is essential for transduction enhancement. Our observations define vectofusin-1 as a member of a new class of α-helical enhancers of lentiviral infection. Its fibril formation is reversible which bears considerable advantages in handling the peptide in conditions well-adapted to Good Manufacturing Practices and scalable gene therapy protocols.

Keywords : Amphipathic peptide Gene therapy Lentiviral vector Nanofibril Vectofusin-1

Document type :

Journal articles

Domain :

Life Sciences [q-bio]

Complete list of metadatas

https://hal-univ-evry.archives-ouvertes.fr/hal-02174366
Contributor : Olek Maciejak <>
Submitted on : Friday, July 5, 2019 - 9:43:19 AM
Last modification on : Tuesday, September 24, 2019 - 4:17:40 PM

Vectofusin-1, a potent peptidic enhancer of viral gene transfer forms pH-dependent α-helical nanofibrils, concentrating viral particles

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Vectofusin-1, a potent peptidic enhancer of viral gene transfer forms pH-dependent α-helical nanofibrils, concentrating viral particles

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