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J. Virol., Nov 1997, 8103-8108, Vol 71, No. 11
JY Han, PM Cannon, KM Lai, Y Zhao, MV Eiden and WF Anderson
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.
Copyright © 1997, American Society for Microbiology
Identification of envelope protein residues required for the expanded host range of 10A1 murine leukemia virus
Gene Therapy Laboratories, Norris Cancer Center, University of Southern California School of Medicine, Los Angeles 90033, USA.
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