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Journal of Virology, October 2000, p. 9464-9470, Vol. 74, No. 20
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Direct Inhibitory Effect of Rotavirus NSP4(114-135) Peptide on the Na+-D-Glucose Symporter of Rabbit Intestinal Brush Border Membrane

Nabil Halaihel,1 Vanessa Liévin,1 Judith M. Ball,2 Mary K. Estes,3 Francisco Alvarado,1,dagger and Monique Vasseur1,*

Institut National de la Santé et de la Recherche Médicale, Unité 510, Faculté de Pharmacie, Université de Paris XI, 92296 Châtenay-Malabry, France1; Department of Pathobiology, Texas Veterinary Medical Center, Texas A&M University, College Station, Texas 77843-44672; and Division of Molecular Biology, Baylor College of Medicine, Texas Medical Center, Houston, Texas 770303

Received 31 March 2000/Accepted 27 July 2000

The direct effect of a rotavirus nonstructural glycoprotein, NSP4, and certain related peptides on the sodium-coupled transport of D-glucose and of L-leucine was studied by using intestinal brush border membrane vesicles isolated from young rabbits. Kinetic analyses revealed that the NSP4(114-135) peptide, which causes diarrhea in young rodents, is a specific, fully noncompetitive inhibitor of the Na+-D-glucose symporter (SGLT1). This interaction involves three peptide-binding sites per carrier unit. In contrast, the Norwalk virus NV(464-483) and mNSP4(131K) peptides, neither of which causes diarrhea, both behave inertly. The NSP4(114-135) and NV(464-483) peptides inhibited Na+-L-leucine symport about equally and partially via a different transport mechanism, in that Na+ behaves as a nonobligatory activator. The selective and strong inhibition caused by the NSP4(114-135) peptide on SGLT1 in vitro suggests that during rotavirus infection in vivo, NSP4 can be one effector directly causing SGLT1 inhibition. This effect, implying a concomitant inhibition of water reabsorption, is postulated to play a mechanistic role in the pathogenesis of rotavirus diarrhea.


* Corresponding author. Mailing address: Unité 510, INSERM, Faculté de Pharmacie, Université de Paris XI, 5, rue J.-B. Clément, 92296 Châtenay-Malabry, France. Phone: (33 1) 46 83 57 95. Fax: (33 1) 46 83 58 44. E-mail: monique.vasseur{at}cep.u-psud.fr.

dagger Present address: Departamento Bioquímica y Biologiá Molecular, Facultad de Farmacia, Universidad de Salamanca, Salamanca, Spain.


Journal of Virology, October 2000, p. 9464-9470, Vol. 74, No. 20
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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