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Issue 13, 2019

Nanoscale organization of tetraspanins during HIV-1 budding by correlative dSTORM/AFM

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Abstract

Membrane partition and remodeling play a key role in numerous cell mechanisms, especially in viral replication cycles where viruses subvert the plasma membrane to enter and escape from the host cell. Specifically assembly and release of HIV-1 particles require specific cellular components, which are recruited to the egress site by the viral protein Gag. We previously demonstrated that HIV-1 assembly alters both partitioning and dynamics of the tetraspanins CD9 and CD81, which are key players in many infectious processes, forming enriched areas where the virus buds. In this study we correlated super resolution microscopy mapping of tetraspanins with membrane topography delineated by atomic force microscopy (AFM) in Gag-expressing cells. We revealed that CD9 is specifically trapped within the nascent viral particles, especially at buds tips, suggesting that Gag mediates CD9 and CD81 depletion from the plasma membrane. In addition, we showed that CD9 is organized as small membrane assemblies of few tens of nanometers that can coalesce upon Gag expression.

Graphical abstract: Nanoscale organization of tetraspanins during HIV-1 budding by correlative dSTORM/AFM

Supplementary files

Article information


Submitted
06 Sep 2018
Accepted
01 Mar 2019
First published
07 Mar 2019

Nanoscale, 2019,11, 6036-6044
Article type
Paper

Nanoscale organization of tetraspanins during HIV-1 budding by correlative dSTORM/AFM

S. Dahmane, C. Doucet, A. Le Gall, C. Chamontin, P. Dosset, F. Murcy, L. Fernandez, D. Salas, E. Rubinstein, M. Mougel, M. Nollmann and P. Milhiet, Nanoscale, 2019, 11, 6036 DOI: 10.1039/C8NR07269H

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