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Journal of Virology, February 2001, p. 1274-1283, Vol. 75, No. 3
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.3.1274-1283.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Sorting of Marburg Virus Surface Protein and Virus
Release Take Place at Opposite Surfaces of Infected Polarized
Epithelial Cells
Christian
Sänger,1
Elke
Mühlberger,1
Elena
Ryabchikova,2
Larissa
Kolesnikova,1,2
Hans-Dieter
Klenk,1 and
Stephan
Becker1,*
Institut für Virologie,
Philipps-Universität Marburg, D-35037 Marburg,
Germany,1 and State Research Center of
Virology and Biotechnology "Vector" Institute of Molecular Biology,
Laboratory of Ultrastructure and Pathomorphology, 633159 Koltsovo,
Novosibirsk Region, Russia2
Received 2 August 2000/Accepted 25 October 2000
Marburg virus, a filovirus, causes severe hemorrhagic fever with
hitherto poorly understood molecular pathogenesis. We have investigated
here the vectorial transport of the surface protein GP of Marburg virus
in polarized epithelial cells. To this end, we established an MDCKII
cell line that was able to express GP permanently (MDCK-GP). The
functional integrity of GP expressed in these cells was analyzed using
vesicular stomatitis virus pseudotypes. Further experiments revealed
that GP is transported in MDCK-GP cells mainly to the apical membrane
and is released exclusively into the culture medium facing the apical
membrane. When MDCKII cells were infected with Marburg virus, the
majority of GP was also transported to the apical membrane, suggesting
that the protein contains an autonomous apical transport signal.
Release of infectious progeny virions, however, took place exclusively
at the basolateral membrane of the cells. Thus, vectorial budding of
Marburg virus is presumably determined by factors other than the
surface protein.
*
Corresponding author. Mailing address: Institut
für Virologie der Philipps-Universität Marburg,
Robert-Koch-Strasse 17, D-35037 Marburg, Germany. Phone: 49 (06421)
286-5433. Fax: 49 (06421) 286-5482. E-mail:
becker{at}mailer.uni-marburg.de.
Journal of Virology, February 2001, p. 1274-1283, Vol. 75, No. 3
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.3.1274-1283.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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