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Journal of Virology, June 1999, p. 5156-5161, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
RGD Inclusion in the Hexon Monomer Provides
Adenovirus Type 5-Based Vectors with a Fiber Knob-Independent
Pathway for Infection
Emmanuelle
Vigne,
Irene
Mahfouz,
Jean-Francois
Dedieu,
Anne
Brie,
Michel
Perricaudet, and
Patrice
Yeh*
CNRS-IGR-Rhône Poulenc Rorer UMR1582,
Institut Gustave Roussy, 94805 Villejuif Cedex, France
Received 19 November 1998/Accepted 1 February 1999
Hypervariable region 5 (HVR5) is a hydrophilic, serotypically
nonconserved loop of the hexon monomer which extrudes from the adenovirus (Ad) capsid. We have replaced the HVR5 sequence of Ad5 with
that of heterologous peptides and studied their effects on virus
viability and peptide accessibility. A poliovirus model epitope was first inserted in a series of nine "isogenic"
viruses that differed in their flanking spacers. Whereas virus
productivity was not profoundly altered by any of these modifications,
immunoprecipitation experiments under nondenaturing conditions
demonstrated that epitope recognition by its cognate monoclonal
antibody (C3 MAb) was strongly linker dependent and
correlated perfectly with the ability of C3 MAb to inhibit
transgene delivery and expression. An
v-specific ligand (DCRGDCF) was then inserted in a suitable linker context to investigate whether hexon-modified capsids would
enhance the transduction of cells displaying limiting amounts
of the virus attachment receptors. Interestingly, although hexon
has never been implicated in Ad entry, the modified virus
significantly increased the transduction of human vascular smooth
muscle cells in vitro. Competition experiments with 293 cells
saturated with recombinant knob further indicated that the
hexon-modified virus could use an additional, knob-independent pathway
for entry. We concluded that genetic engineering of the Ad5
hexon monomer constitutes a novel and feasible approach to equip the
virus with additional targeting ligands.
*
Corresponding author. Mailing address:
CNRS-IGR-Rhône Poulenc Rorer UMR1582, Institut Gustave Roussy,
Rue Camille Desmoulins, 94805 Villejuif Cedex, France. Phone: (33-1) 42 11 50 89. Fax: (33-1) 42 11 52 46. E-mail: pyeh{at}igr.fr.

Present address: Vector Development, Rhône-Poulenc Rorer
Gencell, CRVA, 94403 Vitry-Sur-Seine,
France.
Journal of Virology, June 1999, p. 5156-5161, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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