title: Complexes at the replication origin of Bacillus subtilis with homologous and heterologous DnaA protein.
abstract: The initial steps in the formation of the initiation complex at oriC of Bacillus subtilis were analyzed with special emphasis on the exchangeability of B. subtilis DnaA protein by DnaA of Escherichia coli. The DNA binding domain of B. subtilis DnaA protein was localized in the 93 C-terminal amino acids. Formation of the "initial complex", as analyzed by electron microscopy, was indistinguishable with B. subtilis DnaA protein or with E. coli DnaA. Similarly, both proteins were able to form loops by interaction of DnaA proteins bound to the DnaA box regions upstream and downstream of the dnaA gene in B. subtilis oriC. The region of local unwinding in the "open complex" was precisely defined. It is located at one side of a region of helical instability, a DNA unwinding element (DUE). Unwinding in oriC could only be catalyzed by the homologous DnaA protein.
authors.affiliation: Max-Planck-Institut für molekulare Genetik, Berlin-Dahlem, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Krause
authors.forename: B
authors.initials: B
authors.lastname: Rückert
authors.forename: R
authors.initials: R
authors.lastname: Lurz
authors.forename: W
authors.initials: W
authors.lastname: Messer
mesh_terms: D000595:Amino Acid Sequence; D001412:Bacillus subtilis / Q000737:chemistry* / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D001665:Binding Sites; D004269:DNA, Bacterial / Q000737:chemistry / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000737:chemistry / Q000235:genetics; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D018741:Replication Origin; D013045:Species Specificity
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; C066312:DnaA protein, Bacteria