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J. Virol., Nov 1997, 8103-8108, Vol 71, No. 11
Copyright © 1997, American Society for Microbiology

Identification of envelope protein residues required for the expanded host range of 10A1 murine leukemia virus

JY Han, PM Cannon, KM Lai, Y Zhao, MV Eiden and WF Anderson
Gene Therapy Laboratories, Norris Cancer Center, University of Southern California School of Medicine, Los Angeles 90033, USA.

The 10A1 murine leukemia virus (MuLV) is a recombinant type C retrovirus isolated from a mouse infected with amphotropic MuLV (A- MuLV). 10A1 and A-MuLV have 91% amino acid identity in their envelope proteins yet display different host ranges. For example, CHO-K1 cells are resistant to A-MuLV but susceptible to infection by 10A1. We have now determined that retroviral vectors bearing altered A-MuLV envelope proteins containing 10A1-derived residues at positions 71 (A71G), 74 (Q74K), and 139 (V139M) transduce CHO-K1 cells at efficiencies similar to those achieved with 10A1 enveloped vectors. A-MuLV enveloped retroviral vectors with these three 10A1 residues were also able to transduce A-MuLV-infected NIH 3T3 cells. This observation is consistent with the ability of vectors bearing this altered A-MuLV envelope protein to recognize the 10A1-specific receptor present on NIH 3T3 cells and supports the possibility that residues at positions 71, 74, and 139 of the 10A1 envelope SU protein account for the expanded host range of 10A1.


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Copyright © 1997 by the American Society for Microbiology. All rights reserved.