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Journal of Virology, July 2001, p. 5762-5771, Vol. 75, No. 13
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.13.5762-5771.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
A Particle-Associated Glycoprotein Signal Peptide
Essential for Virus Maturation and Infectivity
Dirk
Lindemann,1,*
Thomas
Pietschmann,1,
Marcus
Picard-Maureau,1
Angelika
Berg,1
Martin
Heinkelein,1
Jana
Thurow,1
Petra
Knaus,2
Hanswalter
Zentgraf,3 and
Axel
Rethwilm1,4
Institut für Virologie und
Immunbiologie1 and
Biozentrum,2 Universität
Würzburg, 97078 Würzburg, Deutsches
Krebsforschungszentrum, 69120 Heidelberg,3 and
Institut für Virologie, Medizinische Fakultät
"Carl Gustav Carus," Technische Universität Dresden, 01307 Dresden,4 Germany
Received 8 January 2001/Accepted 30 March 2001
Signal peptides (SP) are key determinants for targeting
glycoproteins to the secretory pathway. Here we describe the
involvement in particle maturation as an additional function of a viral
glycoprotein SP. The SP of foamy virus (FV) envelope glycoprotein is
predicted to be unusually long. Using an SP-specific antiserum, we
demonstrate that its proteolytic removal occurs posttranslationally by
a cellular protease and that the major N-terminal cleavage product,
gp18, is found in purified viral particles. Analysis of mutants in
proposed signal peptidase cleavage positions and N-glycosylation sites revealed an SP about 148 amino acids (aa) in length. FV particle release from infected cells requires the presence of cognate envelope protein and cleavage of its SP sequence. An N-terminal 15-aa SP domain
with two conserved tryptophan residues was found to be essential for
the egress of FV particles. While the SP N terminus was found to
mediate the specificity of FV Env to interact with FV capsids, it was
dispensable for Env targeting to the secretory pathway and FV
envelope-mediated infectivity of murine leukemia virus pseudotypes.
*
Corresponding author. Mailing address: Institut
für Virologie, Universität Würzburg, Versbacher Str.
7, 97078 Würzburg, Germany. Phone: 49-931-201-3928. Fax:
49-931-201-3934. E-mail: lindemann{at}mail.uni-wuerzburg.de.

Present address: Institut für Virologie, Universität
Mainz, Mainz,
Germany.
Journal of Virology, July 2001, p. 5762-5771, Vol. 75, No. 13
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.13.5762-5771.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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