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Journal of Virology, September 2000, p. 8670-8679, Vol. 74, No. 18
Cell Biology Program, Memorial
Sloan-Kettering Cancer Center, New York, New York 10021
Received 5 April 2000/Accepted 20 June 2000
Budding of lentiviruses occurs at the plasma membrane, but the
preceding steps involved in particle assembly are poorly understood. Since the Gag polyprotein mediates virion assembly and budding, studies
on the localization of Gag within the cell should provide insight into
the mechanism of particle assembly. Here, we utilize biochemical
fractionation techniques as well as high-resolution confocal imaging of
live cells to demonstrate that Gag is localized at the plasma membrane
in a striking punctate pattern. Mutation of the N-terminal
myristoylation site results in the formation of large cytosolic
complexes, whereas mutation of the N-terminal basic residue cluster in
the matrix domain redirects the Gag protein to a region partially
overlapping the Golgi apparatus. In addition, we show that Gag and Env
colocalize at the plasma membrane and that mistargeting of a mutant Gag
to the Golgi apparatus alters the pattern of surface expression of Env.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Localization of Human Immunodeficiency Virus Type 1 Gag and Env at the Plasma Membrane by Confocal Imaging
*
Corresponding author. Mailing address: Memorial
Sloan-Kettering Cancer Center, 1275 York Ave., Box 143, New York, NY
10021. Phone: (212) 639-2514. Fax: (212) 717-3317. E-mail:
m-resh{at}ski.mskcc.org.
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