Human Immunodeficiency Virus Type 1 Nef protein modulates the lipid composition of virions and host cell membrane microdomains View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2007-12

AUTHORS

Britta Brügger, Ellen Krautkrämer, Nadine Tibroni, Claudia E Munte, Susanne Rauch, Iris Leibrecht, Bärbel Glass, Sebastian Breuer, Matthias Geyer, Hans-Georg Kräusslich, Hans Robert Kalbitzer, Felix T Wieland, Oliver T Fackler

ABSTRACT

BACKGROUND: The Nef protein of Human Immunodeficiency Viruses optimizes viral spread in the infected host by manipulating cellular transport and signal transduction machineries. Nef also boosts the infectivity of HIV particles by an unknown mechanism. Recent studies suggested a correlation between the association of Nef with lipid raft microdomains and its positive effects on virion infectivity. Furthermore, the lipidome analysis of HIV-1 particles revealed a marked enrichment of classical raft lipids and thus identified HIV-1 virions as an example for naturally occurring membrane microdomains. Since Nef modulates the protein composition and function of membrane microdomains we tested here if Nef also has the propensity to alter microdomain lipid composition. RESULTS: Quantitative mass spectrometric lipidome analysis of highly purified HIV-1 particles revealed that the presence of Nef during virus production from T lymphocytes enforced their raft character via a significant reduction of polyunsaturated phosphatidylcholine species and a specific enrichment of sphingomyelin. In contrast, Nef did not significantly affect virion levels of phosphoglycerolipids or cholesterol. The observed alterations in virion lipid composition were insufficient to mediate Nef's effect on particle infectivity and Nef augmented virion infectivity independently of whether virus entry was targeted to or excluded from membrane microdomains. However, altered lipid compositions similar to those observed in virions were also detected in detergent-resistant membrane preparations of virus producing cells. CONCLUSION: Nef alters not only the proteome but also the lipid composition of host cell microdomains. This novel activity represents a previously unrecognized mechanism by which Nef could manipulate HIV-1 target cells to facilitate virus propagation in vivo. More... »

PAGES

70

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/1742-4690-4-70

DOI

http://dx.doi.org/10.1186/1742-4690-4-70

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032043522

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/17908312


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