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Journal of Virology, November 1998, p. 9079-9091, Vol. 72, No. 11
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Structure and Function of a Ganglioside Receptor for Porcine Rotavirus

Mark D. Rolsma,dagger Theresa B. Kuhlenschmidt, Howard B. Gelberg, and Mark S. Kuhlenschmidt*

Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, Illinois 61802

Received 13 February 1998/Accepted 21 July 1998

A ganglioside fraction isolated from pooled intestines from newborn to 4-week-old piglets, which we previously partially characterized and showed to specifically inhibit the binding of porcine rotavirus (OSU strain) to host cells (M. D. Rolsma, H. B. Gelberg, and M. S. Kuhlenschmidt, J. Virol. 68:258-268, 1994), was further purified and found to contain two major monosialogangliosides. Each ganglioside was purified to apparent homogeneity, and their carbohydrate structure was examined by high-pH anion-exchange chromatography coupled with pulsed amperometric detection and fast atom bombardment mass spectroscopy. Both gangliosides possessed a sialyllactose oligosaccharide moiety characteristic of GM3 gangliosides. Compositional analyses indicated that each ganglioside was composed of sialic acid, galactose, glucose, and sphingosine in approximately a 1:1:1:1 molar ratio. Each ganglioside differed, however, in the type of sialic acid residue it contained. An N-glycolylneuraminic acid (NeuGc) moiety was found in the more polar porcine GM3, whereas the less polar GM3 species contained N-acetylneuraminic acid (NeuAc). Both NeuGcGM3 and NeuAcGM3 displayed dose-dependent inhibition of virus binding to host cells. NeuGcGM3 was approximately two to three times more effective than NeuAcGM3 in blocking virus binding. Inhibition of binding occurred with as little as 400 pmol of NeuGcGM3/50 ng of virus (~2 × 107 virions) and 2 × 106 cells/ml. Fifty percent inhibition of binding was achieved with 0.64 and 1.5 µM NeuGcGM3 and NeuAcGM3, respectively. The free oligosaccharides 3'- and 6'-sialyllactose inhibited binding 50% at millimolar concentrations, which were nearly 1,000 times the concentration of intact gangliosides required for the same degree of inhibition. Direct binding of infectious, triple-layer rotavirus particles, but not noninfectious, double-layered rotavirus particles, to NeuGcGM3 and NeuAcGM3 was demonstrated by using a thin-layer chromatographic overlay assay. NeuGcGM3 and NeuAcGM3 inhibited virus infectivity of MA-104 cells by 50% at concentrations of 3.97 and 9.84 µM, respectively. NeuGcGM3 (700 nmol/g [dry weight] of intestine) was found to be the predominant enterocyte ganglioside (comprising 75% of the total lipid-bound sialic acid) in neonatal piglets, followed by NeuAcGM3 (200 nmol/g [dry weight] of intestine). NeuGcGM3 and NeuAcGM3 together comprised nearly 100% of the lipid-bound sialic acid in the neonatal intestine, but their quantities rapidly diminished during the first 5 weeks of life. These data support the hypothesis that porcine NeuGcGM3 and NeuAcGM3 are physiologically relevant receptors for porcine rotavirus (OSU strain). Further support for this hypothesis was obtained from virus binding studies using mutant or neuraminidase-treated cell lines. Lec-2 cells, a mutant clone of CHO cells characterized by a 90% reduction in sialyllation of its glycoconjugates, bound less than 5% of the virus compared to control cell binding. In contrast, Lec-1 cells, a mutant CHO clone characterized by a deficiency in glycosylation of N-linked oligosaccharides, still bound rotavirus. Furthermore, exogenous addition of NeuGcGM3 to the Lec-2 mutant cells restored their ability to bind rotavirus in amounts equivalent to that of their parent (CHO) cell line. In the virus-permissive MA-104 cell line, NeuGcGM3 was also able to partially restore rotavirus infectivity in neuraminidase-treated cells. These data suggest that gangliosides play a major role in recognition of host cells by porcine rotavirus (OSU strain).

* Corresponding author. Mailing address: Department of Pathobiology, College of Veterinary Medicine, University of Illinois, 2001 S. Lincoln Ave., Urbana, IL 61802. Phone: (217) 333-9039. Fax: (217) 244-7421. E-mail: kuhlensc{at}staff.uiuc.edu.

dagger Present address: Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, Ala.

Journal of Virology, November 1998, p. 9079-9091, Vol. 72, No. 11
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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