Abstract
Neuraminidase (Nase) activity of chick embryo monolayer cell homogenates was determined by its rate of splitting of neuraminlactose, free neuraminic acid (NA) being determined by the thiobarbituric acid assay. Noninfected cells were found to have no detectable amount of Nase activity. Newcastle disease virus (NDV)-infected cells (multiplicity of infection, 20 to 75 plaque-forming units per cell) displayed a high level of Nase synthesis, the rate of synthesis being parallel to that of hemagglutinin (HA) synthesis (with a 1.5 hr delay in the latter). An “eclipse” of the Nase and HA activities associated with the virus that was adsorbed onto cells was observed. The data provide evidence that the Nase is not incorporated into the viral envelope from a pre-existing cell supply but that its synthesis is coded by the viral genome. The content of cell-bound sialic acid, determined simultaneously in infected-cell homogenates, showed characteristic features allowing certain conclusions concerning the renewal of NA-terminating cell receptors during the course of infection, and the intracellular action of the Nase of the virus introduced into cells by the inoculum and that of the newly synthesized Nase at different stages of infection.
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Selected References
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