PMID:2208289

Citation	Hwang, DS and Kornberg, A (1990) A novel protein binds a key origin sequence to block replication of an E. coli minichromosome. Cell 63:325-31
Abstract	A sequence of three tandem repeats of a 13-mer in the replication origin (oriC) of E. coli is the highly conserved site of opening of the duplex for initiation of DNA synthesis. A protein that binds this sequence has been discovered in E. coli and purified to homogeneity. This novel 33 kd polypeptide behaves as a dimer. Binding to the 13-mers is specific and limited to this region. At a ratio of 10-20 monomers per oriC plasmid, the binding blocks initiation by preventing the opening of the 13-mer region by dnaA protein. Once the 13-mers are opened by dnaA protein action, the 33 kd protein is without effect on the subsequent stages of replication. The specificity of binding and profound inhibitory effect suggest a regulatory role for this protein at an early stage of chromosome initiation.
Links	PubMed
Keywords	Base Sequence; Chromatography, Affinity; Chromatography, Ion Exchange; Chromosomes, Bacterial; DNA Replication; DNA, Bacterial/genetics; DNA-Binding Proteins/isolation & purification; DNA-Binding Proteins/metabolism; Deoxyribonuclease I; Escherichia coli/genetics; Escherichia coli/metabolism; Kinetics; Molecular Sequence Data; Molecular Weight; Oligonucleotide Probes; Plasmids; Restriction Mapping
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