title: Baculovirus GP64-pseudotyped HIV-based lentivirus vectors are stabilized against complement inactivation by codisplay of decay accelerating factor (DAF) or of a GP64-DAF fusion protein.
abstract: The eventual development of efficient gene transfer vectors for in vivo gene delivery will require the development of a number of important new technologies such as stabilization of vectors against protective mechanisms that destroy or otherwise inactivate foreign infectious agents like gene transfer vectors. It is known that the baculovirus envelope protein GP64 of Autographa californica nucleopolyhedrovirus can efficiently pseudotype lentivirus vectors and that modified forms of the baculovirus envelope protein GP64 can also assemble efficiently into baculovirus particles to display functional foreign proteins on the baculovirus surface. In the present study we have combined these techniques to prepare HIV-based lentivirus vectors pseudotyped with GP64 envelope protein and coexpressing a fusion protein of GP64 with the complement-regulatory, decay accelerating factor (DAF, CD55). In addition, we have also prepared GP64-pseudotyped vectors in the presence of a DAF expression plasmid to allow the incorporation of DAF protein into viral particles. Our results demonstrate both the efficient expression and the high-titer production of GP64/GP64-DAF and GP64/DAF-pseudotyped particles and their stability against inactivation by human and nonhuman primate serum.
authors.affiliation: Department of Pediatrics, Center for Molecular Genetics, University of California at San Diego School of Medicine, 9500 Gilman Drive, CMG Building Room 122, La Jolla, California, CA 92093-0634, USA.
authors.forename: Ghiabe H
authors.initials: GH
authors.lastname: Guibinga
authors.forename: Theodore
authors.initials: T
authors.lastname: Friedmann
mesh_terms: D018958:CD55 Antigens / Q000235:genetics* / Q000378:metabolism; D003169:Complement Inactivator Proteins / Q000235:genetics* / Q000378:metabolism; D003165:Complement System Proteins / Q000276:immunology; D005822:Genetic Vectors / Q000235:genetics / Q000276:immunology*; D015497:HIV-1 / Q000235:genetics*; D006801:Humans; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D014760:Viral Fusion Proteins / Q000235:genetics* / Q000378:metabolism
chemical_list: D018958:CD55 Antigens; D003169:Complement Inactivator Proteins; D011993:Recombinant Fusion Proteins; D014760:Viral Fusion Proteins; D003165:Complement System Proteins