title: Analysis of the diphtheria tox promoter by site-directed mutagenesis.
abstract: By oligonucleotide-directed mutagenesis, we introduced alterations in the two putative -10 regions of the diphtheria tox promoter which are positioned at -50 and -56 from the GUG tox initiation signal. The -10 region positioned at -50 is favored in the expression of ADP-ribosyltransferase activity from the wild-type tox promoter in recombinant Escherichia coli; however, the promoter down mutation at position -50 is compensated for by increased activity of the -10 region positioned at -56.
mesh_terms: D036002:ADP Ribose Transferases / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D003353:Corynebacterium diphtheriae / Q000201:enzymology / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D005796:Genes; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D009154:Mutation; D010957:Plasmids; D011401:Promoter Regions, Genetic
chemical_list: D036002:ADP Ribose Transferases