title: Genetic studies on the beta subunit of Escherichia coli RNA polymerase. VIII. Localisation of a region involved in promoter selectivity.
abstract: We have previously isolated an E. coli derivative carrying a small internal deletion (delta(rpoB)1570-1) of the beta structural gene. This RNA polymerase deletion mutant has no noticeable phenotype other than a slightly increased generation time in minimal medium. The deletion, which removes about 165 bp, has been localised to between codons 965 and 1,083, indicating it excises part of a tandem repeat structure present in the C-terminal region of beta. Analysis in vitro of purified RNA polymerase from the deletion mutant indicates that this enzyme has an altered promoter selectivity. These observations allow localisation of a site on the beta polypeptide of E. coli RNA polymerase involved in transcriptional initiation.
mesh_terms: D012321:DNA-Directed RNA Polymerases / Q000235:genetics* / Q000302:isolation & purification; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D005796:Genes; D005798:Genes, Bacterial; D046911:Macromolecular Substances; D009693:Nucleic Acid Hybridization; D011401:Promoter Regions, Genetic; D012091:Repetitive Sequences, Nucleic Acid
chemical_list: D046911:Macromolecular Substances; D012321:DNA-Directed RNA Polymerases