title: A DNA fragment containing the origin of replication of the Escherichia coli chromosome.
abstract: A 38 kilobase pair region of the Escherichia coli K12 chromosome containing the replication origin has been physically mapped with restriction endonucleases EcoRI and HindIII. Replication starts within or very near a 1.3 kilobase pair HindIII fragment in the middle of this region and proceeds outward in both directions with apparently equal speed. This pattern was observed in both dnaA and dnaC temperature-sensitive (ts) initiation mutants at the start of the synchronous round of replication which occurs after downshift from the nonpermissive to the permissive temperature.
mesh_terms: D002874:Chromosome Mapping; D004261:DNA Replication; D004262:DNA Restriction Enzymes; D004269:DNA, Bacterial / Q000032:analysis*; D008970:Molecular Weight; D009154:Mutation; D013696:Temperature
chemical_list: D004269:DNA, Bacterial; D004262:DNA Restriction Enzymes
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