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Journal of Virology, October 2001, p. 8987-8998, Vol. 75, No. 19
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.19.8987-8998.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Study of the Mechanism of Antiviral Action of Iminosugar Derivatives against Bovine Viral Diarrhea Virus

David Durantel,1,* Norica Branza-Nichita,1,2 Sandra Carrouée-Durantel,1 Terry D. Butters,1 Raymond A. Dwek,1 and Nicole Zitzmann1

Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom,1 and Institute of Biochemistry, Splaiul Independentei, Bucharest 77700, Romania2

Received 16 February 2001/Accepted 27 June 2001

The glucose-derived iminosugar derivatives N-butyl- and N-nonyl-deoxynojirimycin (DNJ) have an antiviral effect against a broad spectrum of viruses including Bovine viral diarrhea virus (BVDV). For BVDV, this effect has been attributed to the reduction of viral secretion due to an impairment of viral morphogenesis caused by the ability of DNJ-based iminosugar derivatives to inhibit ER alpha -glucosidases (N. Zitzmann, A. S. Mehta, S. Carrouée, T. D. Butters, F. M. Platt, J. McCauley, B. S. Blumberg, R. A. Dwek, and T. M. Block, Proc. Natl. Acad. Sci. USA 96:11878-11882, 1999). Here we present the antiviral features of newly designed DNJ derivatives and report for the first time the antiviral activity of long-alkyl-chain derivatives of deoxygalactonojirimycin (DGJ), a class of iminosugars derived from galactose which does not inhibit endoplasmic reticulum (ER) alpha -glucosidases. We demonstrate the lack of correlation between the ability of long-alkyl-chain DNJ derivatives to inhibit ER alpha -glucosidases and their antiviral effect, ruling out ER alpha -glucosidase inhibition as the sole mechanism responsible. Using short- and long-alkyl-chain DNJ and DGJ derivatives, we investigated the mechanisms of action of these drugs. First, we excluded their potential action at the level of the replication, protein synthesis, and protein processing. Second, we demonstrated that DNJ derivatives cause both a reduction in viral secretion and a reduction in the infectivity of newly released viral particles. Long-alkyl-chain DGJ derivatives exert their antiviral effect solely via the production of viral particles with reduced infectivity. We demonstrate that long-alkyl-chain DNJ and DGJ derivatives induce an increase in the quantity of E2-E2 dimers accumulated within the ER. The subsequent enrichment of these homodimers in secreted virus particles correlates with their reduced infectivity.

* Corresponding author. Mailing address: Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, Oxford OX1 3QU, United Kingdom. Phone: 44-1865-275341. Fax: 44-1865-275216. E-mail: durantel{at}bioch.ox.ac.uk.

Journal of Virology, October 2001, p. 8987-8998, Vol. 75, No. 19
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.19.8987-8998.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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