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Journal of Virology, October 2000, p. 9362-9371, Vol. 74, No. 20
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Biochemical Characterization of Rotavirus Receptors in MA104 Cells

Carlos A. Guerrero,1,dagger Selene Zárate,1 Gabriel Corkidi,2 Susana López,1 and Carlos F. Arias1,*

Departamento de Genética y Fisiología Molecular, Instituto de Biotecnología,1 and Laboratorio de Procesamiento de Imágenes, Centro de Instrumentos,2 Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62250, Mexico

Received 10 March 2000/Accepted 18 July 2000

We have tested the effect of metabolic inhibitors, membrane cholesterol depletion, and detergent extraction of cell surface molecules on the susceptibility of MA104 cells to infection by rotaviruses. Treatment of cells with tunicamycin, an inhibitor of protein N glycosylation, blocked the infectivity of the SA-dependent rotavirus RRV and its SA-independent variant nar3 by about 50%, while the inhibition of O glycosylation had no effect. The inhibitor of glycolipid biosynthesis d,l-threo-1-phenyl-2-decanoylamino-3-morpholino-1-propanol (PDMP) blocked the infectivity of RRV, nar3, and the human rotavirus strain Wa by about 70%. Sequestration of cholesterol from the cell membrane with beta -cyclodextrin reduced the infectivity of the three viruses by more than 90%. The involvement of N-glycoproteins, glycolipids, and cholesterol in rotavirus infection suggests that the virus receptor(s) might be forming part of lipid microdomains in the cell membrane. MA104 cells incubated with the nonionic detergent octyl-beta -glucoside (OG) showed a ca. 60% reduction in their ability to bind rotaviruses, the same degree to which they became refractory to infection, suggesting that OG extracts the potential virus receptor(s) from the cell surface. Accordingly, when preincubated with the viruses, the OG extract inhibited the virus infectivity by more than 95%. This inhibition was abolished when the extract was treated with either proteases or heat but not when it was treated with neuraminidase, indicating the protein nature of the inhibitor. Two protein fractions of around 57 and 75 kDa were isolated from the extract, and these fractions were shown to have rotavirus-blocking activity. Also, antibodies to these fractions efficiently inhibited the infectivity of the viruses in untreated as well as in neuraminidase-treated cells. Five individual protein bands of 30, 45, 57, 75, and 110 kDa, which exhibited virus-blocking activity, were finally isolated from the OG extract. These proteins are good candidates to function as rotavirus receptors.

* Corresponding author. Mailing address: Instituto de Biotecnología/UNAM, A.P. 510-3, Colonia Miraval, Cuernavaca, Morelos 62250, México. Phone: (52-73) 29-1661. Fax (52-73) 17-2388. E-mail: arias{at}ibt.unam.mx.

dagger Permanent address: Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, Colombia.

Journal of Virology, October 2000, p. 9362-9371, Vol. 74, No. 20
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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