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Journal of Virology, September 2000, p. 8670-8679, Vol. 74, No. 18
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

Luz Hermida-Matsumoto and Marilyn D. Resh*

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.


* 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.


Journal of Virology, September 2000, p. 8670-8679, Vol. 74, No. 18
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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