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A new method was developed for isolation of intracellular forms of simian virus 40 (SV40) nucleoprotein complexes from SV40-infected CV-1 cells late in the infectious cycle. In contrast to the Triton extraction method, which yields only a 60-70S complex, this new procedure yielded three forms of SV40 nucleoprotein complexes: complex I, complex II, and the nature virion (V). The three nucleoprotein complexes differed in physical as well as biochemical properties. Complex I, which is only a small portion of the total SV42 nucleoprotein complexes late during infection, was active in synthesizing both SV40-specific DNA and RNA. Pulse-labeling experiments suggest the following metabolic pathway: I leads to II leads to V. Conversion of complex I to II occurred shortly after the completion of SV40 DNA replication and resulted in the inactivation of the biosynthetic activities of I.

Intracellular forms of simian virus 40 nucleoprotein complexes. I. Methods of isolation and characterization in CV-1 cells