title: Peptide mapping of Bacillus subtilis RNA polymerase alpha factors and core-associated polypeptides.
abstract: An analysis of the peptide maps of the sigma factors and core-associated subunits of Bacillus subtilis RNA polymerase has revealed that all the sigma factors ad core-associated polypeptides are derived from separate genes and are not proteolytically modified products of the major 55,000-dalton sigma factor. A comparison of the peptide pattern of the major B. subtilis and Escherichia coli sigma factors revealed limited homology between them. Furthermore, antibody prepared against the 55,000-dalton B. subtilis sigma factor cross-reacted against the E. coli sigma factor, but not against any of the other B. subtilis sigma factors and core-associated polypeptides. These results unambiguously demonstrate the independently derived nature of the B. subtilis RNA polymerase core-associated subunits and the partial relationship between the major sigma factors of B. subtilis and E. coli.
mesh_terms: D001412:Bacillus subtilis / Q000201:enzymology*; D003429:Cross Reactions; D012321:DNA-Directed RNA Polymerases / Q000032:analysis*; D004591:Electrophoresis, Polyacrylamide Gel; D046911:Macromolecular Substances; D008970:Molecular Weight; D010446:Peptide Fragments / Q000032:analysis; D014357:Trypsin / Q000378:metabolism
chemical_list: D046911:Macromolecular Substances; D010446:Peptide Fragments; D012321:DNA-Directed RNA Polymerases; D014357:Trypsin