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J. Virol., 08 1995, 4847-4853, Vol 69, No. 8
L Rong and P Bates
The genes encoding the receptor for subgroup A Rous sarcoma viruses (tva)
were recently cloned from both chicken and quail cells (P. Bates, J. A. T.
Young, and H. E. Varmus, Cell 74:1043-1051, 1993; J. A. T. Young, P. Bates,
and H. E. Varmus, J. Virol. 67:1811-1816, 1993). Previous work suggested
that only the extracellular domain of Tva interacts with the virus (P.
Bates, J. A. T. Young, and H. E. Varmus, Cell 74:1043-1051, 1993). Tva is a
small membrane-associated protein containing in its extracellular domain a
40-amino-acid region which is closely related to the low-density
lipoprotein receptor (LDLR) repeat motif. To determine the region of the
Tva extracellular domain responsible for viral receptor function, we
created chimeric proteins containing various regions of the Tva
extracellular domain fused with a murine CD8 membrane anchor. Analysis of
these proteins demonstrates that any chimera containing the Tva LDLR repeat
motif can specifically bind the envelope protein of subgroup A avian
sarcoma and leukosis viruses. Furthermore, NIH 3T3 cell lines expressing
these chimeric proteins were efficiently infected by subgroup A avian
sarcoma and leukosis virus vectors. Our results demonstrate that the
40-residue- long LDLR repeat motif of Tva is responsible for viral receptor
function.
Copyright © 1995, American Society for Microbiology
Analysis of the subgroup A avian sarcoma and leukosis virus receptor: the 40-residue, cysteine-rich, low-density lipoprotein receptor repeat motif of Tva is sufficient to mediate viral entry
Department of Microbiology, School of Medicine, University of Pennsylvania, Philadelphia 19104, USA.
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