title: Affinity isolation and I-DIRT mass spectrometric analysis of the Escherichia coli O157:H7 Sakai RNA polymerase complex.
abstract: Bacteria contain a single multisubunit RNA polymerase that is responsible for the synthesis of all RNA. Previous studies of the Escherichia coli K-12 laboratory strain identified a group of effector proteins that interact directly with RNA polymerase to modulate the efficiency of transcription initiation, elongation, or termination. Here we used a rapid affinity isolation technique to isolate RNA polymerase from the pathogenic Escherichia coli strain O157:H7 Sakai. We analyzed the RNA polymerase enzyme complex using mass spectrometry and identified associated proteins. Although E. coli O157:H7 Sakai contains more than 1,600 genes not present in the K-12 strain, many of which are predicted to be involved in transcription regulation, all of the identified proteins in this study were encoded on the "core" E. coli genome.
authors: School of Biosciences, University of Birmingham, Birmingham B15 2TT, United Kingdom. D.lee@bham.ac.uk
authors: David J
authors: DJ
authors: Lee
authors: Stephen J W
authors: SJ
authors: Busby
authors: Lars F
authors: LF
authors: Westblade
authors: Brian T
authors: BT
authors: Chait
mesh_terms: D015153:Blotting, Western; D002846:Chromatography, Affinity / Q000379:methods*; D012321:DNA-Directed RNA Polymerases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D019453:Escherichia coli O157 / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D013058:Mass Spectrometry / Q000379:methods*; D008954:Models, Biological; D011485:Protein Binding; D021122:Protein Subunits / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D053719:Tandem Mass Spectrometry
chemical_list: D029968:Escherichia coli Proteins; D021122:Protein Subunits; D012321:DNA-Directed RNA Polymerases