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The interaction of poliovirus with its cell receptor initiates conformational changes that lead to uncoating of the viral RNA. Three types of genetic analyses have been used to study the poliovirus-receptor interaction: (i) mutagenesis of the poliovirus receptor (PVR), (ii) selection of viral mutants resistant to neutralization with soluble PVR, and (iii) selection of viral variants adapted to use mutant PVRs. The results of these studies show that a small portion of the first immunoglobulin-like domain of PVR contacts viral residues within a deep depression on the surface of the capsid that encircles the fivefold axis of symmetry. Viral capsid residues that influence the interaction with PVR are also found in locations such as the capsid interior that cannot directly contact PVR. These mutations might influence the ability of the capsid to undergo receptor-mediated conformational transitions that are necessary for high-affinity interactions with PVR.

Early events in poliovirus infection: virus-receptor interactions.