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Journal of Virology, November 1999, p. 9130-9136, Vol. 73, No. 11
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Construction of a Pseudoreceptor That Mediates Transduction by Adenoviruses Expressing a Ligand in Fiber or Penton Base

David A. Einfeld,* Douglas E. Brough, Peter W. Roelvink, Imre Kovesdi, and Thomas J. Wickham

GenVec Inc., Rockville, Maryland

Received 30 March 1999/Accepted 23 July 1999

Modification of adenovirus to achieve tissue specific targeting for the delivery of therapeutic genes requires both the ablation of its native tropism and the introduction of specific, novel interactions. Inactivation of the native receptor interactions, however, would cripple the virus for growth in production cells. We have developed an alternative receptor, or pseudoreceptor, for the virus which might allow propagation of viruses with modified fiber proteins that no longer bind to the native adenovirus receptor (coxsackievirus/adenovirus receptor [CAR]). We have constructed a membrane-anchored single-chain antibody [m-scFv(HA)] which recognizes a linear peptide epitope (hemagglutinin [HA]). Incorporation of HA within the HI loop of the fiber protein enabled the modified virus to transduce pseudoreceptor expressing cells under conditions where fiber-CAR interaction was blocked or absent. The pseudoreceptor mediated virus transduction with an efficiency similar to that of CAR. In addition, the HA epitope mediated virus transduction through interaction with the m-scFv(HA) when it was introduced into penton base. These findings indicate that cells expressing the pseudoreceptor should support production of HA-tagged adenoviruses independent of retaining the fiber-CAR interaction. Moreover, they demonstrate that high-affinity targeting ligands may function following insertion into either penton base or fiber.

* Corresponding author. Mailing address: GenVec Inc., 12111 Parklawn Dr., Rockville, MD 20852. Phone: (301) 816-5543. Fax: (301) 816-0440. E-mail: einfeld{at}genvec.com.

Journal of Virology, November 1999, p. 9130-9136, Vol. 73, No. 11
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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