Mouse hepatitis virus receptor activities of an MHVR/mph chimera and MHVR mutants lacking N-linked glycosylation of the N-terminal domain.
Mouse hepatitis virus binds to the N-terminal domain of its receptor, MHVR, a murine biliary glycoprotein with four immunoglobulin-like domains (G.S. Dveksler, M. N. Pensiero, C. W. Dieffenbach, C. B. Cardellichio, A.A. Basile, P.E. Elia, and K. V. Holmes, Proc. Natl. Acad. Sci. USA 90:1716-1720, 1993). A recombinant protein with only the anchored N-terminal domain was not a functional receptor, but a recombinant protein with the N-terminal domain of MHVR linked to the second and third immunoglobulin-like domains and anchor from the mouse poliovirus receptor homolog, mph, was a functional receptor for mouse hepatitis virus. The native four-domain MHVR has 16 potential N-linked glycosylation sites, including three on the N-terminal domain. Recombinant proteins lacking each one of these three sites or all three of them were functional receptors. Thus, glycosylation of the N-terminal domain is not required, but a glycoprotein longer than the N-terminal domain is required for virus receptor activity.
Dveksler
G S
GS
Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814-4799.
Basile
A A
AA
Cardellichio
C B
CB
Holmes
K V
KV
D000818:Animals; D002478:Cells, Cultured; D006224:Cricetinae; D006031:Glycosylation; D006517:Murine hepatitis virus / Q000235:genetics / Q000378:metabolism*; D009154:Mutation; D011991:Receptors, Virus / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins
D011991:Receptors, Virus; D011993:Recombinant Fusion Proteins