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Papers In Press, published online ahead of print November 9, 2000
J. Biol. Chem, 10.1074/jbc.M007876200
Submitted on August 29, 2000
Revised on October 18, 2000
Accepted on November 8, 2000
Max-Planck-Institut for Molecular Genetics, Berlin D-14195
Corresponding Author: messer{at}molgen.mpg.de
Using combined PCR-gel retardation assay the preferred recognition sequence of the Streptomyces initiator protein DnaA was determined. The protein showed a preference towards DNA containing two E. coli-like DnaA boxes in head-to-head arrangement (consensus sequence TTATCCACA, whereas the consensus sequence of the DnaA boxes found in the Streptomyces oriC region is TTGTCCACA). In quantitative band shift experiments the kinetics of the Streptomyces DnaA - DnaA box interaction was characterized. The DnaA protein can form dimers while binding to a single DnaA box; dimer formation is mediated by the domain III of the protein and the dissociation constant of this process was between 35 and 115 nM. Streptomyces initiator protein DnaA interacts in a cooperative manner with DNA containing multiple binding sites. For the cooperativity effect, which seems to be independent of the distance separating the DnaA boxes, domain I (or I and II) is responsible. The cooperativity constant is moderate and is in the range 20-110.
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