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Journal of Virology logoLink to Journal of Virology
. 1988 Jul;62(7):2209–2218. doi: 10.1128/jvi.62.7.2209-2218.1988

Role of VP3 in human rotavirus internalization after target cell attachment via VP7.

N Fukuhara 1, O Yoshie 1, S Kitaoka 1, T Konno 1
PMCID: PMC253354  PMID: 2836605

Abstract

A cell lysate prepared from MA104 cells that had been infected with human rotavirus KUN strain (HRV-KUN) contained a 35-kilodalton protein capable of binding to MA104 cells. The binding of the 35-kilodalton protein was inhibited by a serotype 2-specific antiserum but not by antisera to other serotypes. Not only trypsin-treated, infectious HRV-KUN but also untreated, noninfectious virions effectively competed with the 35-kilodalton protein for the same cell surface binding sites. One monoclonal anti-VP7 (AH6) absorbed the 35-kilodalton protein from the HRV-KUN-infected cell lysate, whereas another monoclonal anti-VP7 (S2-2G10) inhibited the virions to compete with the 35-kilodalton protein for the cell surface binding sites. Both anti-VP7 (S2-2G10) and anti-VP3 (K-1532, K-376) monoclonal antibodies had the virus-neutralization activity, but only anti-VP7 inhibited virus adsorption. On the other hand, anti-VP3 monoclonal antibodies were capable of completely inhibiting the infection of preadsorbed HRV-KUN as long as virions were not yet internalized. Subsequent studies with [35S]methionine-labeled and purified HRV-KUN showed that not only trypsin-treated, infectious virions but also untreated, noninfectious virions were capable of efficient target cell binding and internalization. The internalization modes of these two HRV-KUN preparations were, however, quite different. Only the components of the inner capsid were internalized from trypsin-treated virions, whereas no such selective internalization was seen with untreated virions. Furthermore, anti-VP3 inhibited this selective internalization of the inner capsid from the infectious virions. From these results we conclude that VP7 is the HRV-KUN cell attachment protein and that adsorption of HRV-KUN via VP7 is independent of trypsin treatment, whereas the limited cleavage of VP3 by trypsin, which is essential for the development of HRV-KUN infectivity, is needed for the selective internalization of the inner capsid components, a process that is apparently essential for HRV-KUN infection.

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Selected References

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