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Lipids of BHK 21 cells (baby hamster kidney) grown in tissue culture were labelled with radioactive fatty acids. The enveloped vesicular stomatitis virus was propagated in this host cell type. The virions were purified by density gradient centrifugation. Neuraminidase treatment of the intact virions led to a complete transformation of hematoside [N-acetylneuraminosyl(alpha2-3)lactosyl(beta1-1)ceramide] into lactosylceramide, with identical labelling of the ceramide portion in hematoside of the untreated virions and the lactosylceramide of the neuraminidase-treated particles. The morphology of the virions appeared unchanged in electron micrographs, but the neuraminic-acid-free virions had a strong tendency to aggregate. The results of these studies are evidence that gangliosides are integrated exclusively into the outer lamella of the lipid bilayer in the viral envelope. It is also evident that the viral envelope is a suitable model for studies on membrane asymmetry.

Studies on the Asymmetric Arrangement of Membrane-Lipid-Enveloped Virions as a Model System