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  • 1
    ISSN: 1617-4623
    Subject(s): ColE1 replication ; Primer RNA ; Suppressor mutation ; RF2 ; Ribonuclease H
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two modes of ColE1 DNA replication are known, one dependent on RNase H, and the other RNase H independent. The cer114 mutant of the ColE1 replicon is defective in both modes and carries a single base pair alteration 95 by upstream of the replication origin. An Escherichia coli mutant which restored maintenance of the cer114 replicon was isolated. This host suppressor mutant is defective in RNase H and carries a herC, mutation located at 62 min of the E. coli chromosome. The herC, mutation is recessive to its wild-type allele and supports maintenance of the mutant replicon in the absence of RNase H. The herC, mutation alone conferred cold-sensitive growth, suggesting that the herC, gene product is essential for cell growth. The 1832 by E. coli DNA fragment, containing the wild-type allele of the herC, mutation, was cloned and an open reading frame for the HerC protein was determined.
    Type of Medium: Electronic Resource
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