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. 1993 Aug;67(8):4797–4803. doi: 10.1128/jvi.67.8.4797-4803.1993

Identification of a single amino acid residue in the capsid protein VP1 of coxsackievirus B4 that determines the virulent phenotype.

M Caggana 1, P Chan 1, A Ramsingh 1
PMCID: PMC237866  PMID: 8392614

Abstract

To identify the molecular determinants of virulence for coxsackievirus B4, a panel of recombinant, chimeric viruses were constructed from cDNA clones of a virulent virus, CB4-V, and a nonvirulent virus, CB4-P. Initial studies mapped a major determinant of virulence to the 5' end of the viral genome, which contained the 5' untranslated and the P1 regions (A. Ramsingh, A. Hixson, B. Duceman, and J. Slack, J. Virol. 64:3078-3081, 1990). To determine whether the 5' untranslated region contributed to the virulent phenotype, a chimeric virus (vCB403) containing this region of the virulent virus on an avirulent background was tested in mice. The vCB403 construct displayed a phenotype similar to that of CB4-P, suggesting that the 5' untranslated region did not significantly contribute to virulence. Analysis of the sequence data of the P1 regions of both CB4-V and CB4-P revealed five mutations that resulted in amino acid substitutions in VP1, VP2, and VP4 (A. Ramsingh, H. Araki, S. Bryant, and A. Hixson, Virus Res. 23:281-292, 1992). Analysis of individual mutations in both VP1 and VP2 revealed that a single residue (Thr-129 of VP1) determined the virulent phenotype.

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Selected References

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