Nonstructural glycoprotein NSP4 of group A rotavirus induces diarrhea in neonatal mice by functioning as an enterotoxin. Previously, our laboratory reported that the structural features of group A and group C rotavirus NSP4 proteins are well conserved despite a lack of sequence homology between group A and group C rotavirus NSP4 proteins (Horie Y, et al., Arch Virol (1997) 142: 1865–1872). To test whether group C rotavirus NSP4 has an enterotoxigenic activity, we expressed in Escherichia coli the carboxy two-thirds (corresponding to amino acid residues 55–150) of the NSP4 protein derived from group C rotavirus strain Ehime 9301. This truncated NSP4 protein was able to induce diarrhea in 5-day-old CD-1 mice when administered intraperitoneally. Thus, group C rotavirus NSP4 acts as an enterotoxin like group A rotavirus NSP4.
Archives of Virology – Springer Journals
Published: May 1, 2001
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