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. 1991 Sep;29(9):1780–1784. doi: 10.1128/jcm.29.9.1780-1784.1991

Heterogeneity of capsid proteins of echovirus type 25 wild-type strain and prototype strain, studied by using sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting.

H Peigue-Lafeuille 1, J L Bailly 1, F Fuchs 1, M Chambon 1, M Aymard 1
PMCID: PMC270210  PMID: 1774296

Abstract

Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting were used to compare the capsid proteins of 19 antigenic variants of echovirus type 25 wild-type strains isolated in France between 1976 and 1987 with those of the prototype JV-4 reference strain isolated in 1957. Immunoblots were developed by using polyclonal sera from rabbits and mice immunized with the reference strain. Immunoblotting patterns revealed reactivity only against viral protein VP1 for sera from both animals. Comparative immunoblotting patterns showed differences in the electrophoretic mobilities of viral protein VP1, especially for the Montpellier 76.1262 wild-type strain. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis of [35S]methioinine-labeled viral polypeptides revealed that the two variant strains, Montpellier 76.1262 and Thionville 86.222, exhibited significant and reproducible shifts in the relative mobilities of VP1 and VP3 and, to a lesser extent, in those of VP0 and VP2. The relative mobility of VP4 seemed very similar for the JV-4 reference strain and the two variants. Interestingly, the structural differences in VP1 and VP3 of Montpellier 76.1262 were not correlated with the pattern of neutralization by monoclonal antibodies, unlike in our previous study, in which this strain differed from the prototype strain in only two epitopes. We concluded that, in addition to the heterogeneity of their biological and antigenic properties that we observed previously, echovirus type 25 wild-type strains may exhibit differences in their structural proteins.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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