Escape variants of the XPR1 gammaretrovirus receptor are rare due to reliance on a splice donor site and a short hypervariable loop.

Abstract:

:Entry determinants in the XPR1 receptor for the xenotropic/polytropic mouse leukemia viruses (XP-MLVs) lie in its third and fourth putative extracellular loops (ECLs). The critical ECL3 receptor determinant overlies a splice donor and is evolutionarily conserved in vertebrate XPR1 genes; 2 of the 3 rare replacement mutations at this site destroy this receptor determinant. The 13 residue ECL4 is hypervariable, and replacement mutations carrying an intact ECL3 site alter but do not abolish receptor activity, including replacement of the entire loop with that of a jellyfish (Cnidaria) XPR1. Because ECL4 deletions are found in all X-MLV-infected Mus subspecies, we deleted each ECL4 residue to determine if deletion-associated restriction is residue-specific or is effected by loop size. All deletions influence receptor function, although different deletions affect different XP-MLVs. Thus, receptor usage of a constrained splice site and a loop that tolerates mutations severely limits the likelihood of host escape mutations.

journal_name

Virology

journal_title

Virology

authors

Lu X,Martin C,Bouchard C,Kozak CA

doi

10.1016/j.virol.2014.07.049

subject

Has Abstract

pub_date

2014-11-01 00:00:00

pages

63-71

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(14)00366-3

journal_volume

468-470

pub_type

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