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Journal of Virology, May 2000, p. 4064-4073, Vol. 74, No. 9
CNRS UPR9051, Université Paris 7,
Hôpital Saint-Louis, 75475 Paris Cedex
10,1 CNRS UPR1983, 94801 Villejuif
Cedex,2 and Agence Française de
Sécurité Sanitaire des Aliments, 94703 Maisons-Alfort,3 France
Received 10 November 1999/Accepted 21 January 2000
Foamy viruses (FVs) are complex retroviruses which have been
isolated from different animal species including nonhuman primates, cattle, and cats. Here, we report the isolation and characterization of
a new FV isolated from blood samples of horses. Similar to other FVs,
the equine foamy virus (EFV) exhibits a highly characteristic ultrastructure and induces syncytium formation and subsequent cell
lysis on a large number of cell lines. Molecular cloning of EFV reveals
that the general organization is that of other known FVs, whereas
sequence similarity with its bovine FV counterpart is only 40%.
Interestingly, EFV buds exclusively from the plasma membrane and not
from the endoplasmic reticulum (ER), as previously shown for other FVs.
The absence of the ER retrieval dilysine motif in EFV Env is likely
responsible for this unexpected sorting pathway.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Isolation and Characterization of an Equine
Foamy Virus
*
Corresponding author. Mailing address: CNRS UPR9051,
Université Paris 7, Hôpital Saint-Louis, 75475 Paris Cedex
10, France. Phone: 33-1-53-72-40-96. Fax: 33-1-53-72-40-90. E-mail:
alisaib{at}infobiogen.fr.
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