Abstract
A method for the detection and quantitation of neomycin phosphotransferase (NPT II) activity in recombinant vaccinia virus (VV)-infected eukaryotic cell lysates is described. The assay is linear with respect to both protein concentration and time of incubation. Cytoplasmic extracts of cells infected with a recombinant VV expressing the bacterial neo gene exhibited NPT II levels more than 50-fold higher than those detected in extracts from either uninfected or VV-infected cells. These results indicate that interference from cellular or viral-induced ATPase activities is sufficiently low that NPT II enzyme activity can be measured in crude cell lysates without employing additional protein purification procedures.
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