Two distinct modes of strand unlinking during θ-type DNA replication Journal Article
| Authors: | Hiasa, H.; Marians, K. J. |
| Article Title: | Two distinct modes of strand unlinking during θ-type DNA replication |
| Abstract: | DNA gyrase and topoisomerase IV (Topo IV) are type II bacterial DNA topoisomerases that show a high degree of similarity to each other yet appear to have different functions during DNA replication. We show here that the torsional stress generated during θ-type DNA replication in vitro can take the form of either positive supercoils ahead of the replication fork or catenane-like right-handed windings (precatenanes) of the two partially replicated duplexes behind the fork. Gyrase prefers to act on the former, whereas Topo IV prefers the latter. Removal of either form of positive winding can support nascent chain elongation, but only precatenane removal can support the final stages of DNA replication: processing of the late intermediate and daughter chromosome decatenation. |
| Keywords: | controlled study; nonhuman; dna replication; enzyme activity; bacteria (microorganisms); dna; kinetics; escherichia coli; dna topoisomerase (atp hydrolysing); dna binding; dna, bacterial; enzyme mechanism; dna topoisomerases, type ii; dna topoisomerase iv; dna topoisomerase; dna denaturation; dna supercoiling; dna strand; priority journal; article |
| Journal Title: | Journal of Biological Chemistry |
| Volume: | 271 |
| Issue: | 35 |
| ISSN: | 0021-9258 |
| Publisher: | American Society for Biochemistry and Molecular Biology |
| Date Published: | 1996-08-30 |
| Start Page: | 21529 |
| End Page: | 21535 |
| Language: | English |
| DOI: | 10.1074/jbc.271.35.21529 |
| PUBMED: | 8702938 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | Article -- Export Date: 22 November 2017 -- Source: Scopus |
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