title: DNA binding by the bacteriophage SPO1-encoded type II DNA-binding protein, transcription factor 1. Site-specific binding requires 5-hydroxymethyluracil-containing DNA.
abstract: The bacteriophage SPO1-encoded Type II DNA-binding protein, transcription factor 1 (TF1), forms complexes with specific sites in SPO1 DNA. We have investigated the binding of TF1 to one of its preferred sites in which the normal 5-hydroxymethyluracil (hmUra) of SPO1 DNA has been replaced by thymine and have also investigated the binding of a bacterial Type II DNA-binding protein (from Bacillus stearothermophilus) to the hmUra- and thymine-containing forms of the same DNA segment. Our results show that TF1 binds selectively to this high affinity binding site only in hmUra-containing DNA and that the bacterial Type II DNA-binding protein interacts nonspecifically with both forms of DNA.
mesh_terms: D001665:Binding Sites; D004269:DNA, Bacterial / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D001411:Geobacillus stearothermophilus / Q000235:genetics; D008433:Mathematics; D010432:Pentoxyl / Q000031:analogs & derivatives* / Q000378:metabolism; D013329:Structure-Activity Relationship; D014157:Transcription Factors / Q000378:metabolism*; D014498:Uracil / Q000031:analogs & derivatives*
chemical_list: D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D014157:Transcription Factors; C008055:5-hydroxymethyluracil; D014498:Uracil; D010432:Pentoxyl