title: Escherichia coli lac repressor is elongated with its operator DNA binding domains located at both ends.
mesh_terms: D004269:DNA, Bacterial; D004229:Dithiothreitol; D004926:Escherichia coli / Q000235:genetics*; D007763:Lac Operon; D008958:Models, Molecular; D011487:Protein Conformation; D012097:Repressor Proteins / Q000032:analysis*; D014157:Transcription Factors / Q000032:analysis*; D014961:X-Ray Diffraction
chemical_list: D004269:DNA, Bacterial; D012097:Repressor Proteins; D014157:Transcription Factors; D004229:Dithiothreitol