title: [Circular transcription map of the plasmid pBR322].
abstract: The plasmid pBR322 transcription in the isolated E. coli DNA-dependent RNA-polymerase system was studied. Transcription regions as well as transcripts orientation were defined using both the technique of "criss-cross" hybridization and the annealing of RNA-products with L- and H-strands of plasmid. Summing up obtained data together with available data on promoter localization a circular transcription map of plasmid pBR322 was constructed. Effects of heparin, ion strength and E. coli S-30 system on in vitro transcripts were also studied. The 110-long RNA transcript synthesized in Ori region of pBR322 was found to be the most sensitive to all these factors. RNA-transcripts obtained in in vitro system are able to direct protein synthesis in cell-free S-30 system.
mesh_terms: D001345:Autoradiography; D001483:Base Sequence; D002874:Chromosome Mapping; D004269:DNA, Bacterial / Q000235:genetics; D004270:DNA, Circular / Q000235:genetics; D012321:DNA-Directed RNA Polymerases / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D010957:Plasmids; D014158:Transcription, Genetic
chemical_list: D004269:DNA, Bacterial; D004270:DNA, Circular; D012321:DNA-Directed RNA Polymerases
vernacular_title: Kol'tsevaia transkriptsionnaia karta plazmidy pBR322.