Abstract
The regulatory effects of host cellular histones on the transcription of simian virus 40 (SV40) DNA were investigated by using reconstituted and native SV40 nucleoprotein complexes (NPCs). Reconstituted NPCs were prepared from SV40 DNA and the combination fraction of five histones, H1, H2A, H2B, H3, and H4, isolated from the nuclei of permissive (CV-1) or nonpermissive (BALB/c 3T3, rat liver, and calf thymus) cells. Native NPCs were prepared by alkali disruption of purified SV40 virions. Nuclease digestion of these NPCs gave regular patterns of bands similar to those of SV40 NPCs from SV40-infected CV-1 cells, suggesting the presence of a nucleosomal structure. Transcription of NPCs was analyzed in vitro by using Escherichia coli DNA-dependent RNA polymerase. Both histone H1 and the fraction consisting of all five histones inhibited transcription of SV40 DNA by about 90 to 95%. The fraction consisting of four histones lacking H1 reduced the transcription by 30 to 35%, to a level similar to that of transcription with native NPCs. Transcription was inhibited regardless of whether the origin of histones was permissive or nonpermissive cells. Gel electrophoretic patterns of RNA products transcribed from SV40 DNA and reconstituted and native NPCs showed several identical peaks between 13S and 28S. The patterns were identical whether NPCs reconstituted with H1 alone, all five histones, or four histones lacking H1 were used.
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