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. 1983 Aug;47(2):276–286. doi: 10.1128/jvi.47.2.276-286.1983

Salt-resistant association of simian virus 40 T antigen with simian virus 40 DNA in nucleoprotein complexes.

K Rudolph, K Mann
PMCID: PMC255259  PMID: 6312066

Abstract

Treatment of nucleoprotein complexes (NPCs) from simian virus 40 (SV40)-infected TC7 cells with NaCl (1 or 2 M) or guanidine-hydrochloride (1 or 2 M) resulted in a significant fraction of T antigen still associated with SV40 (I) DNA. Immunoprecipitation of the salt-treated NPCs with SV40 anti-T serum indicated that T antigen is preferentially associated with SV40 (I) DNA rather than with SV40 (II) DNA. Treatment of the NPCs with 4 M guanidine-hydrochloride, however, resulted in a substantial decrease in the amount of SV40 (I) and (II) DNA associated with T antigen. As the temperature was increased to 37 degrees C during incubation of NPCs with NaCl or guanidine-hydrochloride, there was a decrease in the amount of SV40 (I) and (II) DNA immunoprecipitated with SV40 anti-T serum. In the absence of salt, temperature had no effect on the association of T antigen with the SV40 DNA in the NPCs. Treatment of NPCs from SV40 wildtype or tsA58-infected cells grown at the permissive temperature with 1 or 2 M NaCl indicated that tsA T antigen has the same sensitivities as wild-type T antigen to high salt treatment when bound to DNA in NPCs. Characterization of the proteins associated with SV40 (I) DNA after high salt treatment revealed that, in addition to T antigen, a certain amount of viral capsid proteins VP1 and VP3 remained associated with the DNA. Complexes containing SV40 (I) DNA had a sedimentation value of 53S after 1 M NaCl treatment and 43S after 2 M NaCl treatment.

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