Journal: The Journal of Biological Chemistry
Article Title: Direct Involvement of the Master Nitrogen Metabolism Regulator GlnR in Antibiotic Biosynthesis in Streptomyces *
doi: 10.1074/jbc.M116.762476
Figure Lengend Snippet: Defining the GlnR-binding sequence upstream of actII-ORF4. A, DNase I footprinting analysis of the sense strand of the actII-ORF4 promoter region. The upper two electropherograms present the footprinting reactions with no protein or the addition of 1 μg of recombinant His6-GlnR protein. The lower electropherogram shows the sequencing map of the actII-ORF4 promoter region. The sequence protected from DNase I digestion is indicated. The supersensitive site is indicated by an asterisk (*). B, illustration of the sequence upstream of actII-ORF4. The sequence protected by GlnR is shaded, and the putative GlnR-binding site is indicated by bold and italic letters. The actII-ORF4 TSS is shown by a bent arrow. The putative −35 and −10 regions of the actII-ORF4 promoter are underlined. The translational start codon is indicated by a box. C, base mutations introduced into the GlnR-protected DNA sequence in the upstream region of actII-ORF4. D, EMSA analysis between GlnR and the mutated probes. In each reaction, 10 ng of the tested Cy5-labeled mutated probe was added. The wild-type actII-ORF4 probe (actII-ORF4p) was used as a positive control. The amounts of purified His6-GlnR (GlnR, μm) used are as indicated. Free DNA probes and GlnR-DNA complexes are shown by an arrow or an open brace.
Article Snippet: FAM-labeled M13F primer was also used for preparing DNA ladders with a fmol DNA cycle sequencing kit (Promega, Madison, WI).
Techniques: Binding Assay, Sequencing, Footprinting, Recombinant, Labeling, Positive Control, Purification