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Journal of Virology, October 2001, p. 9585-9595, Vol. 75, No. 20
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.20.9585-9595.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Interaction of Classical Swine Fever Virus with Membrane-Associated Heparan Sulfate: Role for Virus Replication In Vivo and Virulence

M. M. Hulst,* H. G. P. van Gennip, A. C. Vlot,dagger E. Schooten, A. J. de Smit, and R. J. M. Moormann

Institute for Animal Science and Health (ID-Lelystad), Research Branch Houtribweg, NL-8200 AB Lelystad, The Netherlands

Received 2 April 2001/Accepted 27 June 2001

Passage of native classical swine fever virus (CSFV) in cultured swine kidney cells (SK6 cells) selects virus variants that attach to the surface of cells by interaction with membrane-associated heparan sulfate (HS). A Ser-to-Arg change in the C terminus of envelope glycoprotein Erns (amino acid 476 in the open reading frame of CSFV) is responsible for selection of these HS-binding virus variants (M. M. Hulst, H. G. P. van Gennip, and R. J. M. Moormann, J. Virol. 74:9553-9561, 2000). In this investigation we studied the role of binding of CSFV to HS in vivo. Using reverse genetics, an HS-independent recombinant virus (S-ST virus) with Ser476 and an HS-dependent recombinant virus (S-RT virus) with Arg476 were constructed. Animal experiments indicated that this adaptive Ser-to-Arg mutation had no effect on the virulence of CSFV. Analysis of viruses reisolated from pigs infected with these recombinant viruses indicated that replication in vivo introduced no mutations in the genes of the envelope proteins Erns, E1, and E2. However, the blood of one of the three pigs infected with the S-RT virus contained also a low level of virus particles that, when grown under a methylcellulose overlay, produced relative large plaques, characteristic of an HS-independent virus. Sequence analysis of such a large-plaque phenotype showed that Arg476 was mutated back to Ser476. Removal of HS from the cell surface and addition of heparin to the medium inhibited infection of cultured (SK6) and primary swine kidney cells with S-ST virus reisolated from pigs by about 70% whereas infection with the administered S-ST recombinant virus produced in SK6 cells was not affected. Furthermore, Erns S-ST protein, produced in insect cells, could bind to immobilized heparin and to HS chains on the surface of SK6 cells. These results indicated that S-ST virus generated in pigs is able to infect cells by an HS-dependent mechanism. Binding of concanavalin A (ConA) to virus particles stimulated the infection of SK6 cells with S-ST virus produced in these cells by 12-fold; in contrast, ConA stimulated infection with S-ST virus generated in pigs no more than 3-fold. This suggests that the surface properties of S-ST virus reisolated from pigs are distinct from those of S-ST virus produced in cell culture. We postulate that due to these surface properties, in vivo-generated CSFV is able to infect cells by an HS-dependent mechanism. Infection studies with the HS-dependent S-RT virus, however, indicated that interaction with HS did not mediate infection of lung macrophages, indicating that alternative receptors are also involved in the attachment of CSFV to cells.

* Corresponding author. Mailing address: Institute for Animal Science and Health (ID-Lelystad), Research Branch Houtribweg, Houtribweg 39, P.O. Box 65, NL-8200 AB Lelystad, The Netherlands. Phone: 31.320.238238. Fax: 31.320.238668. E-mail: m.m.hulst{at}id.wag-ur.nl.

dagger Present address: University of Leiden, Leiden, The Netherlands.

Journal of Virology, October 2001, p. 9585-9595, Vol. 75, No. 20
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.20.9585-9595.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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