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Journal of Virology, October 2000, p. 9464-9470, Vol. 74, No. 20
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.
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
and
*
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.
Present address: Departamento Bioquímica y Biologiá
Molecular, Facultad de Farmacia, Universidad de Salamanca, Salamanca, Spain.
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