Two-Dimensional Gel Electrophoresis to Study the Activity of Type IIA Topoisomerases on Plasmid Replication Intermediates

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Cebrián Castillo, Jorge and Martínez, Victor and Hernández, Pablo and Krimer, Dora B. and Fernández Nestosa, María José and Schvartzman, Jorge B. (2021) Two-Dimensional Gel Electrophoresis to Study the Activity of Type IIA Topoisomerases on Plasmid Replication Intermediates. Biology, 10 (11). p. 1195. ISSN 2079-7737

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Official URL: https://doi.org/10.3390/biology10111195




Abstract

DNA topoisomerases are the enzymes that regulate DNA topology in all living cells. Since the discovery and purification of ω (omega), when the first were topoisomerase identified, the function of many topoisomerases has been examined. However, their ability to relax supercoiling and unlink the pre-catenanes of partially replicated molecules has received little attention. Here, we used two-dimensional agarose gel electrophoresis to test the function of three type II DNA topoisomerases in vitro: the prokaryotic DNA gyrase, topoisomerase IV and the human topoisomerase 2α. We examined the proficiency of these topoisomerases on a partially replicated bacterial plasmid: pBR-TerE@AatII, with an unidirectional replicating fork, stalled when approximately half of the plasmid had been replicated in vivo. DNA was isolated from two strains of Escherichia coli: DH5αF’ and parE10. These experiments allowed us to assess, for the first time, the efficiency of the topoisomerases examined to resolve supercoiling and pre-catenanes in partially replicated molecules and fully replicated catenanes formed in vivo. The results obtained revealed the preferential functions and also some redundancy in the abilities of these DNA topoisomerases in vitro.


Item Type:Article
Uncontrolled Keywords:DNA topology; replication; supercoiling; pre-catenation; two-dimensional agarose gel electrophoresis
Subjects:Medical sciences > Medicine > Medical genetics
ID Code:70761
Deposited On:25 Feb 2022 14:53
Last Modified:28 Feb 2022 08:20

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