title: Small-angle X-ray study of DNA-dependent RNA polymerase holoenzyme from Escherichia coli.
mesh_terms: D012321:DNA-Directed RNA Polymerases; D004926:Escherichia coli / Q000201:enzymology; D011487:Protein Conformation; D012808:Sigma Factor; D014157:Transcription Factors; D014961:X-Ray Diffraction
chemical_list: D012808:Sigma Factor; D014157:Transcription Factors; D012321:DNA-Directed RNA Polymerases