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Journal of Virology, February 2003, p. 1747-1756, Vol. 77, No. 3
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.3.1747-1756.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Role of Plasma Membrane Lipid Microdomains in Respiratory Syncytial Virus Filament Formation

Lewis H. McCurdy and Barney S. Graham*

Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland

Received 10 May 2002/ Accepted 28 October 2002

The fusion protein (F) of respiratory syncytial virus (RSV) is the envelope glycoprotein responsible for the characteristic cytopathology of syncytium formation. RSV has been shown to bud from selective areas of the plasma membrane as pleomorphic virions, including both filamentous and round particles. With immunofluorescent microscopy, we demonstrated evidence of RSV filaments incorporating the fusion protein F and colocalizing with a lipid microdomain-specific fluorescent dye, 1,1-dihexadecyl-3,3,3,3-tetramethylindocarbocyanine perchlorate. Western blot analysis of Triton X-100 cold-extracted membrane fractions confirmed the presence of RSV proteins within the lipid microdomains. RSV proteins also colocalized with cellular proteins associated with lipid microdomains, caveolin-1, and CD44, as well as with RhoA, a small GTPase. ADP-ribosylation of RhoA by Clostridium botulinum exotoxin inactivated RhoA signaling and resulted in the absence of RSV-induced syncytia despite no significant change in viral titer. We demonstrated an overall decrease in both the number and length of the viral filaments and a shift in the localization of F to nonlipid microdomain regions of the membrane in the presence of C3 toxin. This suggests that the selective incorporation of RSV proteins into lipid microdomains during virus assembly may lead to critical interactions of F with cellular proteins, resulting in microvillus projections necessary for the formation of filamentous virus particles and syncytium formation. Thus, manipulation of membrane lipid microdomains may lead to alterations in the production of viral filaments and RSV pathogenesis and provide a new pharmacologic target for RSV therapy.

* Corresponding author. Mailing address: Vaccine Research Center, NIAID, National Institutes of Health, Building 40, Room 2502, 40 Convent Dr., MSC 3017, Bethesda, MD 20892-3017. Phone: (301) 594-8468. Fax: (301) 480-2771. E-mail: bgraham{at}nih.gov.

Journal of Virology, February 2003, p. 1747-1756, Vol. 77, No. 3
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.3.1747-1756.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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