The mechanism of trans-activation of the Escherichia coli operon thrU(tufB) by the protein FIS. A model.
Transcription of the thrU(tufB) operon is trans-activated by the protein FIS which binds to the promoter upstream activator sequence (UAS). Deletions of parts of the UAS and insertions show that optimal trans-activation requires occupation by FIS of the two FIS-binding regions on the UAS and specific helical positioning of these regions. On the basis of these and other data, a model for the mechanism of thrU(tufB) trans-activation by FIS is proposed. This model implies that the mechanisms underlying stimulation by FIS of two totally different processes: inversion of viral DNA segments and transcription of stable RNA operons, are essentially the same.
Verbeek
H
H
Department of Biochemistry, Leiden University, Gorlaeus Laboratories, The Netherlands.
Nilsson
L
L
Bosch
L
L
D001426:Bacterial Proteins / Q000235:genetics; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D002352:Carrier Proteins / Q000235:genetics*; D004252:DNA Mutational Analysis; D004268:DNA-Binding Proteins / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D035021:Factor For Inversion Stimulation Protein; D034982:Integration Host Factors; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D009876:Operon / Q000235:genetics; D010444:Peptide Elongation Factor Tu / Q000235:genetics*; D012329:RNA, Bacterial / Q000235:genetics; D012343:RNA, Transfer / Q000235:genetics*; D011995:Recombination, Genetic / Q000235:genetics; D012045:Regulatory Sequences, Nucleic Acid / Q000235:genetics; D015533:Transcriptional Activation / Q000235:genetics*
D001426:Bacterial Proteins; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; D035021:Factor For Inversion Stimulation Protein; D034982:Integration Host Factors; D012329:RNA, Bacterial; C440502:integration host factor, E coli; D012343:RNA, Transfer; D010444:Peptide Elongation Factor Tu