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. 1997 Jun;71(6):4728–4735. doi: 10.1128/jvi.71.6.4728-4735.1997

Cold-adapted poliovirus mutants bypass a postentry replication block.

A W Dove 1, V R Racaniello 1
PMCID: PMC191694  PMID: 9151866

Abstract

In the current model of poliovirus entry, the initial interaction of the native virion with its cellular receptor is followed by a transition to an altered form, which then acts as an intermediate in viral entry. While the native virion sediments at 160S in a sucrose gradient, the altered particle sediments at 135S, has lost the coat protein VP4, and has become more hydrophobic. Altered particles can be found both associated with cells and in the culture medium. It has been hypothesized that the cell-associated 135S particle releases the viral genome into the cell cytoplasm and that nonproductive transitions to the 135S form are responsible for the high particle-to-PFU ratio observed for polioviruses. At 25 degrees C, a temperature at which the transition to 135S particles does not occur, the P1/Mahoney strain of poliovirus was unable to replicate, and cold-adapted (ca) mutants were selected from the population. These mutants have not gained the ability to convert to 135S particles at 25 degrees C, and the block to wild-type (wt) infection at low temperatures is not at the level of cellular entry. The particle-to-PFU ratio of poliovirus does not change at 25 degrees C in the absence of alteration. Three independent amino acid changes in the 2C coding region were identified in ca mutants, at positions 218 (Val to Ile), 241 (Arg to Ala), and 309 (Met to Val). Introduction of any of these mutations individually into wt poliovirus by site-directed mutagenesis confers the ca phenotype. All three serotypes of the Sabin vaccine strains and the P3/Leon strain of poliovirus also exhibit the ca phenotype. These results do not support a model of poliovirus entry into cells that includes an obligatory transition to the 135S particle.

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Selected References

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