The DNA replication fork blocked at the Ter site may be an entrance for the RecBCD enzyme into duplex DNA
10.1128/jb.176.15.4656-4663.1994
Crossref journal-article
American Society for Microbiology
Journal of Bacteriology (235)
Abstract

In Escherichia coli, eight kinds of chromosome-derived DNA fragments (named Hot DNA) were found to exhibit homologous recombinational hotspot activity, with the following properties. (i) The Hot activities of all Hot DNAs were enhanced extensively under RNase H-defective (rnh) conditions. (ii) Seven Hot DNAs were clustered at the DNA replication terminus region on the E. coli chromosome and had Chi activities (H. Nishitani, M. Hidaka, and T. Horiuchi, Mol. Gen. Genet. 240:307-314, 1993). Hot activities of HotA, -B, and -C, the locations of which were close to three DNA replication terminus sites, the TerB, -A, and -C sites, respectively, disappeared when terminus-binding (Tau or Tus) protein was defective, thereby suggesting that their Hot activities are termination event dependent. Other Hot groups showed termination-independent Hot activities. In addition, at least HotA activity proved to be dependent on a Chi sequence, because mutational destruction of the Chi sequence on the HotA DNA fragment resulted in disappearance of the HotA activity. The HotA activity which had disappeared was reactivated by insertion of a new, properly oriented Chi sequence at the position between the HotA DNA and the TerB site. On the basis of these observations and positional and orientational relationships between the Chi and the Ter sequences, we propose a model in which the DNA replication fork blocked at the Ter site provides an entrance for the RecBCD enzyme into duplex DNA.

Bibliography

Horiuchi, T., Fujimura, Y., Nishitani, H., Kobayashi, T., & Hidaka, M. (1994). The DNA replication fork blocked at the Ter site may be an entrance for the RecBCD enzyme into duplex DNA. Journal of Bacteriology, 176(15), 4656–4663.

Authors 5
  1. T Horiuchi (first)
  2. Y Fujimura (additional)
  3. H Nishitani (additional)
  4. T Kobayashi (additional)
  5. M Hidaka (additional)
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Created 8 years, 9 months ago (Nov. 7, 2016, 4:33 p.m.)
Deposited 4 years, 1 month ago (July 29, 2021, 1:55 p.m.)
Indexed 4 months, 2 weeks ago (April 16, 2025, 6:48 a.m.)
Issued 31 years ago (Aug. 1, 1994)
Published 31 years ago (Aug. 1, 1994)
Published Print 31 years ago (Aug. 1, 1994)
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@article{Horiuchi_1994, title={The DNA replication fork blocked at the Ter site may be an entrance for the RecBCD enzyme into duplex DNA}, volume={176}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.176.15.4656-4663.1994}, DOI={10.1128/jb.176.15.4656-4663.1994}, number={15}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Horiuchi, T and Fujimura, Y and Nishitani, H and Kobayashi, T and Hidaka, M}, year={1994}, month=aug, pages={4656–4663} }