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. 1997 Oct;71(10):7814–7819. doi: 10.1128/jvi.71.10.7814-7819.1997

Selection of an avian retrovirus mutant with extended receptor usage.

R A Taplitz 1, J M Coffin 1
PMCID: PMC192135  PMID: 9311868

Abstract

Receptor recognition by avian retroviruses is thought to involve the interaction of two regions of the SU protein, hr1 and hr2, with the host cell surface receptor. These regions exhibit considerable variation, concordant with differences in receptor usage among the many avian leukosis virus subgroups. We hypothesize that some retroviruses have altered receptor usage in response to selective pressures imposed by receptor polymorphisms in their hosts. To test this hypothesis, we passaged td-Pr-RSV-B on cocultured permissive chicken (C/E) and nonpermissive quail (QT6/BD) cells. A variant virus with an expanded host range was identified at passage 29 and ultimately shown to be identical in sequence to td-Pr-RSV-B, except for changes at codons 155 and 156 of SU amino acid corresponding to two amino acid changes within hr1. Superinfection resistance studies suggest that the variant virus recognizes the subgroup B receptor on chicken cells and the subgroup E receptor on quail cells. These findings indicate that altered receptor usage can be conferred by small changes in env and may point to a key region for receptor interaction. Further, they demonstrate the evolutionary potential of retroviral env genes to alter receptor usage in response to appropriate selective pressure.

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Selected References

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