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Journal of Virology, September 2004, p. 9560-9563, Vol. 78, No. 17
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.17.9560-9563.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Human Immunodeficiency Virus Type 1 Matrix Inhibits and Confers Cooperativity on Gag Precursor-Membrane Interactions

David Perez-Caballero, Theodora Hatziioannou, Juan Martin-Serrano, and Paul D. Bieniasz*

Aaron Diamond AIDS Research Center and the Rockefeller University, New York, New York

Received 7 February 2004/ Accepted 12 April 2004

Human immunodeficiency virus type 1 (HIV-1) Gag multimerization and membrane binding are required for particle formation. However, it is unclear what constitutes a minimal plasma membrane-specific targeting signal and what role the matrix (MA) globular head and other Gag domains play in membrane targeting. Here, we use membrane flotation and microscopic analysis of Gag deletion mutants to demonstrate that the HIV-1 MA globular head inhibits a plasma membrane-specific targeting signal contained within the six amino-terminal MA residues. MA-mediated inhibition is relieved by concentration-dependent Gag multimerization and imparts a high degree of cooperativity on Gag-membrane association. This cooperativity may confer temporal and spatial regulation on HIV-1 assembly.

* Corresponding author. Mailing address: Aaron Diamond AIDS Research Center, 455 First Ave., New York, NY 10016. Phone: (212) 448-5070. Fax: (212) 725-1126. E-mail: pbienias{at}adarc.org.

Journal of Virology, September 2004, p. 9560-9563, Vol. 78, No. 17
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.17.9560-9563.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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Copyright © 2004 by the American Society for Microbiology. All rights reserved.