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Journal of Virology, January 2005, p. 1053-1061, Vol. 79, No. 2
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.2.1053-1061.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Deletion of Penton RGD Motifs Affects the Efficiency of both the Internalization and the Endosome Escape of Viral Particles Containing Adenovirus Serotype 5 or 35 Fiber Knobs

Dmitry M. Shayakhmetov,1,{dagger} Andrea M. Eberly,1,{dagger} Zong-Yi Li,1 and André Lieber1,2*

Department of Medicine,1 Department of Pathology, University of Washington School of Medicine, Seattle, Washington2

Received 17 June 2004/ Accepted 3 September 2004

Adenovirus (Ad) vectors are widely used for gene delivery in vitro and in vivo. A solid understanding of the biology of this virus is imperative for the development of novel, effective, and safe vectors. For the group C adenovirus serotypes 2 and 5 that use CAR as a primary attachment receptor, it is known that the penton base RGD motifs interact with cellular integrins and that this interaction promotes virus internalization. However, the RGD motif's impact on the efficiency of postinternalization steps, such as the escape of the virus particle from the endosome, is less defined. Furthermore, the role of penton-integrin interactions remains unknown for new vectors possessing group B Ad fiber knobs that use CD46 as a primary virus attachment receptor. In this study, we used vectors with the RGD motif deleted that contained Ad5 and B-group Ad35 fiber knobs and long fiber shafts and studied the role of RGD-integrin interactions in virus internalization and endosome escape. The deletion of the RGD motif in the penton base did not affect virus attachment, regardless of the type of cellular receptor used for attachment. RGD motif deletion, however, significantly reduced the rate of virus internalization for both the Ad5 and Ad35 fiber knob-containing vectors. This study also demonstrates the role of penton RGD motifs in facilitating the endosome escape step of virus infection and indicates that penton-integrin interactions are involved in internalization of capsid-chimeric CD46-interacting Ads with long fiber shafts.

* Corresponding author. Mailing address: Department of Medicine, University of Washington School of Medicine, Seattle, WA 98195. Phone: (206) 221-3973. Fax: (206) 685-8675. E-mail: lieber00{at}u.washington.edu.

{dagger} D.M.S. and A.M.E. contributed equally to this work.

Journal of Virology, January 2005, p. 1053-1061, Vol. 79, No. 2
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.2.1053-1061.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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