1
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Jian JY, McCarty KD, Byl J, Guengerich FP, Neuman K, Osheroff N. Basis for the discrimination of supercoil handedness during DNA cleavage by human and bacterial type II topoisomerases. Nucleic Acids Res 2023; 51:3888-3902. [PMID: 36999602 PMCID: PMC10164583 DOI: 10.1093/nar/gkad190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 02/24/2023] [Accepted: 03/23/2023] [Indexed: 04/01/2023] Open
Abstract
To perform double-stranded DNA passage, type II topoisomerases generate a covalent enzyme-cleaved DNA complex (i.e. cleavage complex). Although this complex is a requisite enzyme intermediate, it is also intrinsically dangerous to genomic stability. Consequently, cleavage complexes are the targets for several clinically relevant anticancer and antibacterial drugs. Human topoisomerase IIα and IIβ and bacterial gyrase maintain higher levels of cleavage complexes with negatively supercoiled over positively supercoiled DNA substrates. Conversely, bacterial topoisomerase IV is less able to distinguish DNA supercoil handedness. Despite the importance of supercoil geometry to the activities of type II topoisomerases, the basis for supercoil handedness recognition during DNA cleavage has not been characterized. Based on the results of benchtop and rapid-quench flow kinetics experiments, the forward rate of cleavage is the determining factor of how topoisomerase IIα/IIβ, gyrase and topoisomerase IV distinguish supercoil handedness in the absence or presence of anticancer/antibacterial drugs. In the presence of drugs, this ability can be enhanced by the formation of more stable cleavage complexes with negatively supercoiled DNA. Finally, rates of enzyme-mediated DNA ligation do not contribute to the recognition of DNA supercoil geometry during cleavage. Our results provide greater insight into how type II topoisomerases recognize their DNA substrates.
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Affiliation(s)
- Jeffrey Y Jian
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Kevin D McCarty
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Jo Ann W Byl
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - F Peter Guengerich
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Keir C Neuman
- Laboratory of Single Molecule Biophysics, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20982, USA
| | - Neil Osheroff
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Department of Medicine (Hematology/Oncology), Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- VA Tennessee Valley Healthcare System, Nashville, TN 37212, USA
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2
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Boot A, Liu M, Stantial N, Shah V, Yu W, Nitiss KC, Nitiss JL, Jinks-Robertson S, Rozen SG. Recurrent mutations in topoisomerase IIα cause a previously undescribed mutator phenotype in human cancers. Proc Natl Acad Sci U S A 2022; 119:e2114024119. [PMID: 35058360 PMCID: PMC8795545 DOI: 10.1073/pnas.2114024119] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 12/13/2021] [Indexed: 01/01/2023] Open
Abstract
Topoisomerases nick and reseal DNA to relieve torsional stress associated with transcription and replication and to resolve structures such as knots and catenanes. Stabilization of the yeast Top2 cleavage intermediates is mutagenic in yeast, but whether this extends to higher eukaryotes is less clear. Chemotherapeutic topoisomerase poisons also elevate cleavage, resulting in mutagenesis. Here, we describe p.K743N mutations in human topoisomerase hTOP2α and link them to a previously undescribed mutator phenotype in cancer. Overexpression of the orthologous mutant protein in yeast generated a characteristic pattern of 2- to 4-base pair (bp) duplications resembling those in tumors with p.K743N. Using mutant strains and biochemical analysis, we determined the genetic requirements of this mutagenic process and showed that it results from trapping of the mutant yeast yTop2 cleavage complex. In addition to 2- to 4-bp duplications, hTOP2α p.K743N is also associated with deletions that are absent in yeast. We call the combined pattern of duplications and deletions ID_TOP2α. All seven tumors carrying the hTOP2α p.K743N mutation showed ID_TOP2α, while it was absent from all other tumors examined (n = 12,269). Each tumor with the ID_TOP2α signature had indels in several known cancer genes, which included frameshift mutations in tumor suppressors PTEN and TP53 and an activating insertion in BRAF. Sequence motifs found at ID_TOP2α mutations were present at 80% of indels in cancer-driver genes, suggesting that ID_TOP2α mutagenesis may contribute to tumorigenesis. The results reported here shed further light on the role of topoisomerase II in genome instability.
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Affiliation(s)
- Arnoud Boot
- Programme in Cancer and Stem Cell Biology, Duke University-National University of Singapore Medical School (Duke-NUS Medical School), 169857 Singapore;
- Centre for Computational Biology, Duke-NUS Medical School, 169857 Singapore
| | - Mo Liu
- Programme in Cancer and Stem Cell Biology, Duke University-National University of Singapore Medical School (Duke-NUS Medical School), 169857 Singapore
- Centre for Computational Biology, Duke-NUS Medical School, 169857 Singapore
| | - Nicole Stantial
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710
| | - Viraj Shah
- Pharmaceutical Sciences Department, University of Illinois at Chicago, Rockford, IL 61107
| | - Willie Yu
- Programme in Cancer and Stem Cell Biology, Duke University-National University of Singapore Medical School (Duke-NUS Medical School), 169857 Singapore
- Centre for Computational Biology, Duke-NUS Medical School, 169857 Singapore
| | - Karin C Nitiss
- Pharmaceutical Sciences Department, University of Illinois at Chicago, Rockford, IL 61107
| | - John L Nitiss
- Pharmaceutical Sciences Department, University of Illinois at Chicago, Rockford, IL 61107
| | - Sue Jinks-Robertson
- Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710;
| | - Steven G Rozen
- Programme in Cancer and Stem Cell Biology, Duke University-National University of Singapore Medical School (Duke-NUS Medical School), 169857 Singapore;
- Centre for Computational Biology, Duke-NUS Medical School, 169857 Singapore
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3
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Stelljes JT, Weidlich D, Gubaev A, Klostermeier D. Gyrase containing a single C-terminal domain catalyzes negative supercoiling of DNA by decreasing the linking number in steps of two. Nucleic Acids Res 2019; 46:6773-6784. [PMID: 29893908 PMCID: PMC6061840 DOI: 10.1093/nar/gky470] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 05/18/2018] [Indexed: 12/18/2022] Open
Abstract
The topological state of DNA in vivo is regulated by topoisomerases. Gyrase is a bacterial topoisomerase that introduces negative supercoils into DNA at the expense of ATP hydrolysis. According to the strand-passage mechanism, a double-strand of the DNA substrate is cleaved, and a second double-stranded segment is passed through the gap, converting a positive DNA node into a negative node. The correct orientation of these DNA segments for strand passage is achieved by wrapping of the DNA around gyrase, which involves the C-terminal domains (CTDs) of both GyrA subunits in the A2B2 heterotetramer. Gyrase lacking both CTDs cannot introduce negative supercoils into DNA. Here, we analyze the requirements for the two CTDs in individual steps in the supercoiling reaction. Gyrase that contains a single CTD binds, distorts, and cleaves DNA similarly to wildtype gyrase. It also shows wildtype-like DNA-dependent ATPase activity, and undergoes DNA-induced movement of the CTD as well as N-gate narrowing. Most importantly, the enzyme still introduces negative supercoils into DNA in an ATP-dependent reaction, with a velocity similar to wildtype gyrase, and decreases the linking number of the DNA in steps of two. One CTD is thus sufficient to support DNA supercoiling.
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Affiliation(s)
- Jampa Tsedön Stelljes
- University of Muenster, Institute for Physical Chemistry, Corrensstrasse 30, D-48149 Muenster, Germany
| | - Daniela Weidlich
- University of Muenster, Institute for Physical Chemistry, Corrensstrasse 30, D-48149 Muenster, Germany
| | - Airat Gubaev
- University of Muenster, Institute for Physical Chemistry, Corrensstrasse 30, D-48149 Muenster, Germany
| | - Dagmar Klostermeier
- University of Muenster, Institute for Physical Chemistry, Corrensstrasse 30, D-48149 Muenster, Germany
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4
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DNA Topoisomerase Inhibitors: Trapping a DNA-Cleaving Machine in Motion. J Mol Biol 2019; 431:3427-3449. [PMID: 31301408 PMCID: PMC6723622 DOI: 10.1016/j.jmb.2019.07.008] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 06/24/2019] [Accepted: 07/02/2019] [Indexed: 12/29/2022]
Abstract
Type II topoisomerases regulate DNA topology by making a double-stranded break in one DNA duplex, transporting another DNA segment through this break and then resealing it. Bacterial type IIA topoisomerase inhibitors, such as fluoroquinolones and novel bacterial topoisomerase inhibitors, can trap DNA cleavage complexes with double- or single-stranded cleaved DNA. To study the mode of action of such compounds, 21 crystal structures of a “gyraseCORE” fusion truncate of Staphyloccocus aureus DNA gyrase complexed with DNA and diverse inhibitors have been published, as well as 4 structures lacking inhibitors. These structures have the DNA in various cleavage states and appear to track trajectories along the catalytic paths of the DNA cleavage/religation steps. The various conformations sampled by these multiple “gyraseCORE” structures show rigid body movements of the catalytic GyrA WHD and GyrB TOPRIM domains across the dimer interface. Conformational changes common to all compound-bound structures suggest common mechanisms for DNA cleavage-stabilizing compounds. The structures suggest that S. aureus gyrase uses a single moving-metal ion for cleavage and that the central four base pairs need to be stretched between the two catalytic sites, in order for a scissile phosphate to attract a metal ion to the A-site to catalyze cleavage, after which it is “stored” in another coordination configuration (B-site) in the vicinity. We present a simplified model for the catalytic cycle in which capture of the transported DNA segment causes conformational changes in the ATPase domain that push the DNA gate open, resulting in stretching and cleaving the gate-DNA in two steps. Type II DNA topoisomerases, such as DNA gyrase, control the topological state of DNA in all cells. As these enzymes bind, cleave and re-ligate DNA, multiple binding pockets for small compounds appear. We discuss how crystal structures of gyrase, DNA and different compounds may be trapping different stages in the catalytic cycle of the enzyme. We propose a model for DNA strand cleavage involving a moving metal ion.
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5
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Jang Y, Son H, Lee SW, Hwang W, Jung SR, Byl JAW, Osheroff N, Lee S. Selection of DNA Cleavage Sites by Topoisomerase II Results from Enzyme-Induced Flexibility of DNA. Cell Chem Biol 2019; 26:502-511.e3. [PMID: 30713098 DOI: 10.1016/j.chembiol.2018.12.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 10/04/2018] [Accepted: 12/04/2018] [Indexed: 12/26/2022]
Abstract
Topoisomerase II cleaves DNA at preferred sequences with different efficiencies; however, the mechanism of cleavage site selection is not known. Here we used single-molecule fluorescence assays that monitor several critical steps of DNA-topoisomerase II interactions, including binding/dissociation, bending/straightening, and cleavage/religation, and reveal that the cleavage site is selected mainly during the bending step. Furthermore, despite the sensitivity of the bending rate to the DNA sequence, it is not an intrinsic property of the DNA itself. Rather, it is determined by protein-DNA interactions.
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Affiliation(s)
- Yunsu Jang
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea
| | - Heyjin Son
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea
| | - Sang-Wook Lee
- Department of Physics and Astronomy, National Center for Creative Research Initiatives, Seoul National University, Seoul 08826, South Korea
| | - Wonseok Hwang
- Department of Physics and Astronomy, National Center for Creative Research Initiatives, Seoul National University, Seoul 08826, South Korea
| | - Seung-Ryoung Jung
- Department of Physics and Astronomy, National Center for Creative Research Initiatives, Seoul National University, Seoul 08826, South Korea
| | - Jo Ann W Byl
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA
| | - Neil Osheroff
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA; Department of Medicine (Hematology/Oncology), Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA; VA Tennessee Valley Healthcare System, Nashville, TN 37212, USA.
| | - Sanghwa Lee
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea.
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6
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Gibson EG, Blower TR, Cacho M, Bax B, Berger JM, Osheroff N. Mechanism of Action of Mycobacterium tuberculosis Gyrase Inhibitors: A Novel Class of Gyrase Poisons. ACS Infect Dis 2018; 4:1211-1222. [PMID: 29746087 DOI: 10.1021/acsinfecdis.8b00035] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Tuberculosis is one of the leading causes of morbidity worldwide, and the incidences of drug resistance and intolerance are prevalent. Thus, there is a desperate need for the development of new antitubercular drugs. Mycobacterium tuberculosis gyrase inhibitors (MGIs) are napthyridone/aminopiperidine-based drugs that display activity against M. tuberculosis cells and tuberculosis in mouse models [Blanco, D., et al. (2015) Antimicrob. Agents Chemother. 59, 1868-1875]. Genetic and mutagenesis studies suggest that gyrase, which is the target for fluoroquinolone antibacterials, is also the target for MGIs. However, little is known regarding the interaction of these drugs with the bacterial type II enzyme. Therefore, we examined the effects of two MGIs, GSK000 and GSK325, on M. tuberculosis gyrase. MGIs greatly enhanced DNA cleavage mediated by the bacterial enzyme. In contrast to fluoroquinolones (which induce primarily double-stranded breaks), MGIs induced only single-stranded DNA breaks under a variety of conditions. MGIs work by stabilizing covalent gyrase-cleaved DNA complexes and appear to suppress the ability of the enzyme to induce double-stranded breaks. The drugs displayed little activity against type II topoisomerases from several other bacterial species, suggesting that these drugs display specificity for M. tuberculosis gyrase. Furthermore, MGIs maintained activity against M. tuberuclosis gyrase enzymes that contained the three most common fluoroquinolone resistance mutations seen in the clinic and displayed no activity against human topoisomerase IIα. These findings suggest that MGIs have potential as antitubercular drugs, especially in the case of fluoroquinolone-resistant disease.
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Affiliation(s)
| | - Tim R. Blower
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2185, United States
| | - Monica Cacho
- Department of Diseases of the Developing World, GlaxoSmithKline, Parque Tecnológico de Madrid, Calle de Severo Ochoa, 2, 28760 Tres Cantos, Madrid, Spain
| | - Ben Bax
- Medicines Discovery Institute, Cardiff University, Cardiff CF10 3AT, United Kingdom
| | - James M. Berger
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2185, United States
| | - Neil Osheroff
- VA Tennessee Valley Healthcare System, Nashville, Tennessee 37212, United States
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7
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Infante Lara L, Fenner S, Ratcliffe S, Isidro-Llobet A, Hann M, Bax B, Osheroff N. Coupling the core of the anticancer drug etoposide to an oligonucleotide induces topoisomerase II-mediated cleavage at specific DNA sequences. Nucleic Acids Res 2018; 46:2218-2233. [PMID: 29447373 PMCID: PMC5861436 DOI: 10.1093/nar/gky072] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 01/18/2018] [Accepted: 02/06/2018] [Indexed: 12/13/2022] Open
Abstract
Etoposide and other topoisomerase II-targeted drugs are important anticancer therapeutics. Unfortunately, the safe usage of these agents is limited by their indiscriminate induction of topoisomerase II-mediated DNA cleavage throughout the genome and by a lack of specificity toward cancer cells. Therefore, as a first step toward constraining the distribution of etoposide-induced DNA cleavage sites and developing sequence-specific topoisomerase II-targeted anticancer agents, we covalently coupled the core of etoposide to oligonucleotides centered on a topoisomerase II cleavage site in the PML gene. The initial sequence used for this 'oligonucleotide-linked topoisomerase inhibitor' (OTI) was identified as part of the translocation breakpoint of a patient with acute promyelocytic leukemia (APL). Subsequent OTI sequences were derived from the observed APL breakpoint between PML and RARA. Results indicate that OTIs can be used to direct the sites of etoposide-induced DNA cleavage mediated by topoisomerase IIα and topoisomerase IIβ. OTIs increased levels of enzyme-mediated cleavage by inhibiting DNA ligation, and cleavage complexes induced by OTIs were as stable as those induced by free etoposide. Finally, OTIs directed against the PML-RARA breakpoint displayed cleavage specificity for oligonucleotides with the translocation sequence over those with sequences matching either parental gene. These studies demonstrate the feasibility of using oligonucleotides to direct topoisomerase II-mediated DNA cleavage to specific sites in the genome.
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MESH Headings
- Antineoplastic Agents/chemistry
- Antineoplastic Agents/pharmacology
- Base Sequence
- DNA Cleavage/drug effects
- DNA Topoisomerases, Type II/metabolism
- Etoposide/chemistry
- Etoposide/pharmacology
- Feasibility Studies
- Humans
- Leukemia, Promyelocytic, Acute/drug therapy
- Leukemia, Promyelocytic, Acute/genetics
- Leukemia, Promyelocytic, Acute/metabolism
- Oligonucleotides/chemistry
- Oligonucleotides/pharmacology
- Oncogene Proteins, Fusion/antagonists & inhibitors
- Oncogene Proteins, Fusion/genetics
- Oncogene Proteins, Fusion/metabolism
- Topoisomerase II Inhibitors/chemistry
- Topoisomerase II Inhibitors/pharmacology
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Affiliation(s)
- Lorena Infante Lara
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA
| | - Sabine Fenner
- Platform Technology and Science, GlaxoSmithKline, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Steven Ratcliffe
- Platform Technology and Science, GlaxoSmithKline, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Albert Isidro-Llobet
- Platform Technology and Science, GlaxoSmithKline, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Michael Hann
- Platform Technology and Science, GlaxoSmithKline, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Ben Bax
- Platform Technology and Science, GlaxoSmithKline, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
- York Structural Biology Laboratory, Department of Chemistry, University of York, York YO10 5DD, UK
| | - Neil Osheroff
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA
- Department of Medicine (Hematology/Oncology), Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- VA Tennessee Valley Healthcare System, Nashville, TN 37212, USA
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8
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Hartmann S, Weidlich D, Klostermeier D. Single-Molecule Confocal FRET Microscopy to Dissect Conformational Changes in the Catalytic Cycle of DNA Topoisomerases. Methods Enzymol 2016; 581:317-351. [PMID: 27793284 DOI: 10.1016/bs.mie.2016.08.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Molecular machines undergo large-scale conformational changes during their catalytic cycles that are linked to their biological functions. DNA topoisomerases are molecular machines that interconvert different DNA topoisomers and resolve torsional stress that is introduced during cellular processes that involve local DNA unwinding. DNA gyrase catalyzes the introduction of negative supercoils into DNA in an ATP-dependent reaction. During its catalytic cycle, gyrase undergoes large-scale conformational changes that drive the supercoiling reaction. These conformational changes can be followed by single-molecule Förster resonance energy transfer (FRET). Here, we use DNA gyrase from Bacillus subtilis as an illustrative example to present strategies for the investigation of conformational dynamics of multisubunit complexes. We provide a brief introduction into single-molecule FRET and confocal microscopy, with a focus on practical considerations in sample preparation and data analysis. Different strategies in the preparation of donor-acceptor-labeled molecules suitable for single-molecule FRET experiments are outlined. The insight into the mechanism of DNA supercoiling by gyrase gained from single-molecule FRET experiment is summarized. The general strategies described here can also be applied to investigate conformational changes and their link to biological function of other multisubunit molecular machines.
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Affiliation(s)
- S Hartmann
- Institute for Physical Chemistry, University of Muenster, Muenster, Germany
| | - D Weidlich
- Institute for Physical Chemistry, University of Muenster, Muenster, Germany
| | - D Klostermeier
- Institute for Physical Chemistry, University of Muenster, Muenster, Germany.
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9
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Pommier Y, Sun Y, Huang SYN, Nitiss JL. Roles of eukaryotic topoisomerases in transcription, replication and genomic stability. Nat Rev Mol Cell Biol 2016; 17:703-721. [DOI: 10.1038/nrm.2016.111] [Citation(s) in RCA: 540] [Impact Index Per Article: 67.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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10
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Gubaev A, Weidlich D, Klostermeier D. DNA gyrase with a single catalytic tyrosine can catalyze DNA supercoiling by a nicking-closing mechanism. Nucleic Acids Res 2016; 44:10354-10366. [PMID: 27557712 PMCID: PMC5137430 DOI: 10.1093/nar/gkw740] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/20/2016] [Accepted: 08/12/2016] [Indexed: 01/10/2023] Open
Abstract
The topological state of DNA is important for replication, recombination and transcription, and is regulated in vivo by DNA topoisomerases. Gyrase introduces negative supercoils into DNA at the expense of ATP hydrolysis. It is the accepted view that gyrase achieves supercoiling by a strand passage mechanism, in which double-stranded DNA is cleaved, and a second double-stranded segment is passed through the gap, converting a positive DNA node into a negative node. We show here that gyrase with only one catalytic tyrosine that cleaves a single strand of its DNA substrate can catalyze DNA supercoiling without strand passage. We propose an alternative mechanism for DNA supercoiling via nicking and closing of DNA that involves trapping, segregation and relaxation of two positive supercoils. In contrast to DNA supercoiling, ATP-dependent relaxation and decatenation of DNA by gyrase lacking the C-terminal domains require both tyrosines and strand passage. Our results point towards mechanistic plasticity of gyrase and might pave the way for finding novel and specific mechanism-based gyrase inhibitors.
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Affiliation(s)
- Airat Gubaev
- University of Muenster, Institute for Physical Chemistry, Corrensstrasse 30, D-48149 Muenster, Germany
| | - Daniela Weidlich
- University of Muenster, Institute for Physical Chemistry, Corrensstrasse 30, D-48149 Muenster, Germany
| | - Dagmar Klostermeier
- University of Muenster, Institute for Physical Chemistry, Corrensstrasse 30, D-48149 Muenster, Germany
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11
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Wilson JT, Jiang X, McGill BC, Lisic EC, Deweese JE. Examination of the Impact of Copper(II) α-(N)-Heterocyclic Thiosemicarbazone Complexes on DNA Topoisomerase IIα. Chem Res Toxicol 2016; 29:649-58. [DOI: 10.1021/acs.chemrestox.5b00471] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- James T. Wilson
- Department
of Pharmaceutical Sciences, Lipscomb University College of Pharmacy and Health Sciences, Nashville, Tennessee 37204-3951, United States
| | - Xiaohua Jiang
- Department
of Chemistry, Tennessee Technological University, Cookeville, Tennessee 38505, United States
| | - Bradley C. McGill
- Department
of Chemistry, Tennessee Technological University, Cookeville, Tennessee 38505, United States
| | - Edward C. Lisic
- Department
of Chemistry, Tennessee Technological University, Cookeville, Tennessee 38505, United States
| | - Joseph E. Deweese
- Department
of Pharmaceutical Sciences, Lipscomb University College of Pharmacy and Health Sciences, Nashville, Tennessee 37204-3951, United States
- Department
of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
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12
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Olorunniji FJ, McPherson AL, Pavlou HJ, McIlwraith MJ, Brazier JA, Cosstick R, Stark WM. Nicked-site substrates for a serine recombinase reveal enzyme-DNA communications and an essential tethering role of covalent enzyme-DNA linkages. Nucleic Acids Res 2015; 43:6134-43. [PMID: 25990737 PMCID: PMC4499144 DOI: 10.1093/nar/gkv521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 04/30/2015] [Accepted: 05/07/2015] [Indexed: 11/12/2022] Open
Abstract
To analyse the mechanism and kinetics of DNA strand cleavages catalysed by the serine recombinase Tn3 resolvase, we made modified recombination sites with a single-strand nick in one of the two DNA strands. Resolvase acting on these sites cleaves the intact strand very rapidly, giving an abnormal half-site product which accumulates. We propose that these reactions mimic second-strand cleavage of an unmodified site. Cleavage occurs in a synapse of two sites, held together by a resolvase tetramer; cleavage at one site stimulates cleavage at the partner site. After cleavage of a nicked-site substrate, the half-site that is not covalently linked to a resolvase subunit dissociates rapidly from the synapse, destabilizing the entire complex. The covalent resolvase-DNA linkages in the natural reaction intermediate thus perform an essential DNA-tethering function. Chemical modifications of a nicked-site substrate at the positions of the scissile phosphodiesters result in abolition or inhibition of resolvase-mediated cleavage and effects on resolvase binding and synapsis, providing insight into the serine recombinase catalytic mechanism and how resolvase interacts with the substrate DNA.
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Affiliation(s)
- Femi J Olorunniji
- Institute of Molecular, Cell and Systems Biology, University of Glasgow, Bower Building, Glasgow G12 8QQ, UK
| | - Arlene L McPherson
- Institute of Molecular, Cell and Systems Biology, University of Glasgow, Bower Building, Glasgow G12 8QQ, UK
| | - Hania J Pavlou
- Department of Physiology, Anatomy and Genetics, University of Oxford, Sherrington Building, Parks Road, Oxford OX1 3PT, UK
| | - Michael J McIlwraith
- Beatson Institute for Cancer Research, Switchback Road, Bearsden, Glasgow G61 1BD, UK
| | - John A Brazier
- Reading School of Pharmacy, University of Reading, Whiteknights, Reading, Berkshire, RG6 6AD, UK
| | - Richard Cosstick
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, UK
| | - W Marshall Stark
- Institute of Molecular, Cell and Systems Biology, University of Glasgow, Bower Building, Glasgow G12 8QQ, UK
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13
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Huang NL, Lin JH. Recovery of the poisoned topoisomerase II for DNA religation: coordinated motion of the cleavage core revealed with the microsecond atomistic simulation. Nucleic Acids Res 2015; 43:6772-86. [PMID: 26150421 PMCID: PMC4538842 DOI: 10.1093/nar/gkv672] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 06/19/2015] [Indexed: 01/24/2023] Open
Abstract
Type II topoisomerases resolve topological problems of DNA double helices by passing one duplex through the reversible double-stranded break they generated on another duplex. Despite the wealth of information in the cleaving operation, molecular understanding of the enzymatic DNA ligation remains elusive. Topoisomerase poisons are widely used in anti-cancer and anti-bacterial therapy and have been employed to entrap the intermediates of topoisomerase IIβ with religatable DNA substrate. We removed drug molecules from the structure and conducted molecular dynamics simulations to investigate the enzyme-mediated DNA religation. The drug-unbound intermediate displayed transitions toward the resealing-compliant configuration: closing distance between the cleaved DNA termini, B-to-A transformation of the double helix, and restoration of the metal-binding motif. By mapping the contact configurations and the correlated motions between enzyme and DNA, we identified the indispensable role of the linker preceding winged helix domain (WHD) in coordinating the movements of TOPRIM, the nucleotide-binding motifs, and the bound DNA substrate during gate closure. We observed a nearly vectorial transition in the recovery of the enzyme and identified the previously uncharacterized roles of Asn508 and Arg677 in DNA rejoining. Our findings delineate the dynamic mechanism of the DNA religation conducted by type II topoisomerases.
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Affiliation(s)
- Nan-Lan Huang
- Research Center for Applied Sciences, Academia Sinica, Nangang, Taipei 11529, Taiwan
| | - Jung-Hsin Lin
- Research Center for Applied Sciences, Academia Sinica, Nangang, Taipei 11529, Taiwan Institute of Biomedical Sciences, Academia Sinica, Nangang, Taipei 11529, Taiwan School of Pharmacy, National Taiwan University, Taipei 10050, Taiwan
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14
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Abstract
TDP1 and TDP2 were discovered and named based on the fact they process 3'- and 5'-DNA ends by excising irreversible protein tyrosyl-DNA complexes involving topoisomerases I and II, respectively. Yet, both enzymes have an extended spectrum of activities. TDP1 not only excises trapped topoisomerases I (Top1 in the nucleus and Top1mt in mitochondria), but also repairs oxidative damage-induced 3'-phosphoglycolates and alkylation damage-induced DNA breaks, and excises chain terminating anticancer and antiviral nucleosides in the nucleus and mitochondria. The repair function of TDP2 is devoted to the excision of topoisomerase II- and potentially topoisomerases III-DNA adducts. TDP2 is also essential for the life cycle of picornaviruses (important human and bovine pathogens) as it unlinks VPg proteins from the 5'-end of the viral RNA genome. Moreover, TDP2 has been involved in signal transduction (under the former names of TTRAP or EAPII). The DNA repair partners of TDP1 include PARP1, XRCC1, ligase III and PNKP from the base excision repair (BER) pathway. By contrast, TDP2 repair functions are coordinated with Ku and ligase IV in the non-homologous end joining pathway (NHEJ). This article summarizes and compares the biochemistry, functions, and post-translational regulation of TDP1 and TDP2, as well as the relevance of TDP1 and TDP2 as determinants of response to anticancer agents. We discuss the rationale for developing TDP inhibitors for combinations with topoisomerase inhibitors (topotecan, irinotecan, doxorubicin, etoposide, mitoxantrone) and DNA damaging agents (temozolomide, bleomycin, cytarabine, and ionizing radiation), and as novel antiviral agents.
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Affiliation(s)
- Yves Pommier
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, Building 37, Room 5068, NIH, Bethesda, MD 20892, USA.
| | - Shar-yin N Huang
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, Building 37, Room 5068, NIH, Bethesda, MD 20892, USA
| | - Rui Gao
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, Building 37, Room 5068, NIH, Bethesda, MD 20892, USA
| | - Benu Brata Das
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, Building 37, Room 5068, NIH, Bethesda, MD 20892, USA; Laboratory of Molecular Biology, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Junko Murai
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, Building 37, Room 5068, NIH, Bethesda, MD 20892, USA; Department of Radiation Genetics, Graduate School of Medicine, Kyoto University, Yoshidakonoe, Sakyo-ku 606-8501, Japan
| | - Christophe Marchand
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, Building 37, Room 5068, NIH, Bethesda, MD 20892, USA
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15
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Gubaev A, Klostermeier D. Reprint of "The mechanism of negative DNA supercoiling: a cascade of DNA-induced conformational changes prepares gyrase for strand passage". DNA Repair (Amst) 2014; 20:130-141. [PMID: 24974097 DOI: 10.1016/j.dnarep.2014.06.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 01/03/2014] [Accepted: 01/13/2014] [Indexed: 01/04/2023]
Abstract
DNA topoisomerases inter-convert different DNA topoisomers in the cell. They catalyze the introduction or relaxation of DNA supercoils, as well as catenation and decatenation. Members of the type I topoisomerase family cleave a single strand of their double-stranded DNA substrate, whereas enzymes of the type II family cleave both DNA strands. Bacterial DNA gyrase, a type II topoisomerase, catalyzes the introduction of negative supercoils into DNA in an ATP-dependent reaction. Gyrase is not present in humans, and constitutes an attractive drug target for the treatment of bacterial and parasite infections. DNA supercoiling by gyrase is believed to occur by a strand passage mechanism, in which one segment of the double-stranded DNA substrate is passed through a (transient) break in a second segment. This mechanism requires the coordinated opening and closing of three protein interfaces, so-called gates, to ensure the directionality of strand passage toward negative supercoiling. Single molecule fluorescence resonance energy transfer experiments are ideally suited to investigate conformational changes during the catalytic cycle of DNA topoisomerases. In this review, we summarize the current knowledge on the cascade of DNA- and nucleotide-induced conformational changes in gyrase that lead to strand passage and negative supercoiling of DNA. We discuss how these conformational changes couple ATP hydrolysis to DNA supercoiling in gyrase, and how the common mechanistic principle of coordinated gate opening and closing is modulated to allow for the catalysis of different reactions by different type II topoisomerases.
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Affiliation(s)
- Airat Gubaev
- Institute for Physical Chemistry, University of Muenster, Corrensstrasse 30, D-48149 Muenster, Germany
| | - Dagmar Klostermeier
- Institute for Physical Chemistry, University of Muenster, Corrensstrasse 30, D-48149 Muenster, Germany.
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16
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Gubaev A, Klostermeier D. The mechanism of negative DNA supercoiling: a cascade of DNA-induced conformational changes prepares gyrase for strand passage. DNA Repair (Amst) 2014; 16:23-34. [PMID: 24674625 DOI: 10.1016/j.dnarep.2014.01.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 01/03/2014] [Accepted: 01/13/2014] [Indexed: 11/29/2022]
Abstract
DNA topoisomerases inter-convert different DNA topoisomers in the cell. They catalyze the introduction or relaxation of DNA supercoils, as well as catenation and decatenation. Members of the type I topoisomerase family cleave a single strand of their double-stranded DNA substrate, whereas enzymes of the type II family cleave both DNA strands. Bacterial DNA gyrase, a type II topoisomerase, catalyzes the introduction of negative supercoils into DNA in an ATP-dependent reaction. Gyrase is not present in humans, and constitutes an attractive drug target for the treatment of bacterial and parasite infections. DNA supercoiling by gyrase is believed to occur by a strand passage mechanism, in which one segment of the double-stranded DNA substrate is passed through a (transient) break in a second segment. This mechanism requires the coordinated opening and closing of three protein interfaces, so-called gates, to ensure the directionality of strand passage toward negative supercoiling. Single molecule fluorescence resonance energy transfer experiments are ideally suited to investigate conformational changes during the catalytic cycle of DNA topoisomerases. In this review, we summarize the current knowledge on the cascade of DNA- and nucleotide-induced conformational changes in gyrase that lead to strand passage and negative supercoiling of DNA. We discuss how these conformational changes couple ATP hydrolysis to DNA supercoiling in gyrase, and how the common mechanistic principle of coordinated gate opening and closing is modulated to allow for the catalysis of different reactions by different type II topoisomerases.
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Affiliation(s)
- Airat Gubaev
- Institute for Physical Chemistry, University of Muenster, Corrensstrasse 30, D-48149 Muenster, Germany
| | - Dagmar Klostermeier
- Institute for Physical Chemistry, University of Muenster, Corrensstrasse 30, D-48149 Muenster, Germany.
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17
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Keenholtz RA, Mouw KW, Boocock MR, Li NS, Piccirilli JA, Rice PA. Arginine as a general acid catalyst in serine recombinase-mediated DNA cleavage. J Biol Chem 2013; 288:29206-14. [PMID: 23970547 DOI: 10.1074/jbc.m113.508028] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Members of the serine family of site-specific DNA recombinases use an unusual constellation of amino acids to catalyze the formation and resolution of a covalent protein-DNA intermediate. A recent high resolution structure of the catalytic domain of Sin, a particularly well characterized family member, provided a detailed view of the catalytic site. To determine how the enzyme might protonate and stabilize the 3'O leaving group in the strand cleavage reaction, we examined how replacing this oxygen with a sulfur affected the cleavage rate by WT and mutant enzymes. To facilitate direct comparison of the cleavage rates, key experiments used suicide substrates that prevented religation after cleavage. The catalytic defect associated with mutation of one of six highly conserved arginine residues, Arg-69 in Sin, was partially rescued by a 3' phosphorothiolate substrate. We conclude that Arg-69 has an important role in stabilizing the 3'O leaving group and is the prime candidate for the general acid that protonates the 3'O, in good agreement with the position it occupies in the high resolution structure of the active site of Sin.
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18
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Structure of a topoisomerase II-DNA-nucleotide complex reveals a new control mechanism for ATPase activity. Nat Struct Mol Biol 2012; 19:1147-54. [PMID: 23022727 PMCID: PMC3492516 DOI: 10.1038/nsmb.2388] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Accepted: 08/23/2012] [Indexed: 11/22/2022]
Abstract
Type IIA topoisomerases control DNA supercoiling and disentangle chromosomes by a complex, ATP-dependent strand passage mechanism. Although a general framework exists for type IIA topoisomerase function, the architecture of the full-length enzyme has remained undefined. Here we present the first structure of a fully-catalytic Saccharomyces cerevisiae topoisomerase II homodimer, complexed with DNA and a nonhydrolyzable ATP analog. The enzyme adopts a domain-swapped configuration wherein the ATPase domain of one protomer sits atop the nucleolytic region of its partner subunit. This organization produces an unexpected interaction between the bound DNA and a conformational transducing element in the ATPase domain, which we show is critical for both DNA-stimulated ATP hydrolysis and global topoisomerase activity. Our data indicate that the ATPase domains pivot about each other to ensure unidirectional strand passage and that this state senses bound DNA to promote ATP turnover and enzyme reset.
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19
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Ketron AC, Denny WA, Graves DE, Osheroff N. Amsacrine as a topoisomerase II poison: importance of drug-DNA interactions. Biochemistry 2012; 51:1730-9. [PMID: 22304499 DOI: 10.1021/bi201159b] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Amsacrine (m-AMSA) is an anticancer agent that displays activity against refractory acute leukemias as well as Hodgkin's and non-Hodgkin's lymphomas. The drug is comprised of an intercalative acridine moiety coupled to a 4'-amino-methanesulfon-m-anisidide headgroup. m-AMSA is historically significant in that it was the first drug demonstrated to function as a topoisomerase II poison. Although m-AMSA was designed as a DNA binding agent, the ability to intercalate does not appear to be the sole determinant of drug activity. Therefore, to more fully analyze structure-function relationships and the role of DNA binding in the action of m-AMSA, we analyzed a series of derivatives for the ability to enhance DNA cleavage mediated by human topoisomerase IIα and topoisomerase IIβ and to intercalate DNA. Results indicate that the 3'-methoxy (m-AMSA) positively affects drug function, potentially by restricting the rotation of the headgroup in a favorable orientation. Shifting the methoxy to the 2'-position (o-AMSA), which abrogates drug function, appears to increase the degree of rotational freedom of the headgroup and may impair interactions of the 1'-substituent or other portions of the headgroup within the ternary complex. Finally, the nonintercalative m-AMSA headgroup enhanced enzyme-mediated DNA cleavage when it was detached from the acridine moiety, albeit with 100-fold lower affinity. Taken together, our results suggest that much of the activity and specificity of m-AMSA as a topoisomerase II poison is embodied in the headgroup, while DNA intercalation is used primarily to increase the affinity of m-AMSA for the topoisomerase II-DNA cleavage complex.
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Affiliation(s)
- Adam C Ketron
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
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20
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DNA cleavage and opening reactions of human topoisomerase IIα are regulated via Mg2+-mediated dynamic bending of gate-DNA. Proc Natl Acad Sci U S A 2012; 109:2925-30. [PMID: 22323612 DOI: 10.1073/pnas.1115704109] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Topoisomerase II resolves intrinsic topological problems of double-stranded DNA. As part of its essential cellular functions, the enzyme generates DNA breaks, but the regulation of this potentially dangerous process is not well understood. Here we report single-molecule fluorescence experiments that reveal a previously uncharacterized sequence of events during DNA cleavage by topoisomerase II: nonspecific DNA binding, sequence-specific DNA bending, and stochastic cleavage of DNA. We have identified unexpected structural roles of Mg(2+) ions coordinated in the TOPRIM (topoisomerase-primase) domain in inducing cleavage-competent DNA bending. A break at one scissile bond dramatically stabilized DNA bending, explaining how two scission events in opposing strands can be coordinated to achieve a high probability of double-stranded cleavage. Clamping of the protein N-gate greatly enhanced the rate and degree of DNA bending, resulting in a significant stimulation of the DNA cleavage and opening reactions. Our data strongly suggest that the accurate cleavage of DNA by topoisomerase II is regulated through a tight coordination with DNA bending.
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21
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22
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Jacob DA, Mercer SL, Osheroff N, Deweese JE. Etoposide quinone is a redox-dependent topoisomerase II poison. Biochemistry 2011; 50:5660-7. [PMID: 21595477 DOI: 10.1021/bi200438m] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Etoposide is a topoisomerase II poison that is used to treat a variety of human cancers. Unfortunately, 2-3% of patients treated with etoposide develop treatment-related leukemias characterized by 11q23 chromosomal rearrangements. The molecular basis for etoposide-induced leukemogenesis is not understood but is associated with enzyme-mediated DNA cleavage. Etoposide is metabolized by CYP3A4 to etoposide catechol, which can be further oxidized to etoposide quinone. A CYP3A4 variant is associated with a lower risk of etoposide-related leukemias, suggesting that etoposide metabolites may be involved in leukemogenesis. Although etoposide acts at the enzyme-DNA interface, several quinones poison topoisomerase II via redox-dependent protein adduction. The effects of etoposide quinone on topoisomerase IIα-mediated DNA cleavage have been examined previously. Although findings suggest that the activity of the quinone is slightly greater than that of etoposide, these studies were carried out in the presence of significant levels of reducing agents (which should reduce etoposide quinone to the catechol). Therefore, we examined the ability of etoposide quinone to poison human topoisomerase IIα in the absence of reducing agents. Under these conditions, etoposide quinone was ∼5-fold more active than etoposide at inducing enzyme-mediated DNA cleavage. Consistent with other redox-dependent poisons, etoposide quinone inactivated topoisomerase IIα when incubated with the protein prior to DNA and lost activity in the presence of dithiothreitol. Unlike etoposide, the quinone metabolite did not require ATP for maximal activity and induced a high ratio of double-stranded DNA breaks. Our results support the hypothesis that etoposide quinone contributes to etoposide-related leukemogenesis.
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Affiliation(s)
- David A Jacob
- Department of Pharmaceutical Sciences, Lipscomb University College of Pharmacy, Nashville, Tennessee 37204-3951, USA
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23
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Gentry AC, Pitts SL, Jablonsky MJ, Bailly C, Graves DE, Osheroff N. Interactions between the etoposide derivative F14512 and human type II topoisomerases: implications for the C4 spermine moiety in promoting enzyme-mediated DNA cleavage. Biochemistry 2011; 50:3240-9. [PMID: 21413765 DOI: 10.1021/bi200094z] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
F14512 is a novel etoposide derivative that contains a spermine in place of the C4 glycosidic moiety. The drug was designed to exploit the polyamine transport system that is upregulated in some cancers. However, a preliminary study suggests that it is also a more efficacious topoisomerase II poison than etoposide [Barret et al. (2008) Cancer Res. 68, 9845-9853]. Therefore, we undertook a more complete study of the actions of F14512 against human type II topoisomerases. As determined by saturation transfer difference (1)H NMR spectroscopy, contacts between F14512 and human topoisomerase IIα in the binary enzyme-drug complex are similar to those of etoposide. Although the spermine of F14512 does not interact with the enzyme, it converts the drug to a DNA binder [Barret et al. (2008)]. Consequently, the influence of the C4 spermine on drug activity was assessed. F14512 is a highly active topoisomerase II poison and stimulates DNA cleavage mediated by human topoisomerase IIα or topoisomerase IIβ. The drug is more potent and efficacious than etoposide or TOP-53, an etoposide derivative that contains a C4 aminoalkyl group that strengthens drug-enzyme binding. Unlike the other drugs, F14512 maintains robust activity in the absence of ATP. The enhanced activity of F14512 correlates with a tighter binding and an increased stability of the ternary topoisomerase II-drug-DNA complex. The spermine-drug core linkage is critical for these attributes. These findings demonstrate the utility of a C4 DNA binding group and provide a rational basis for the development of novel and more active etoposide-based topoisomerase II poisons.
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Affiliation(s)
- Amanda C Gentry
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
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24
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Pitts SL, Liou GF, Mitchenall LA, Burgin AB, Maxwell A, Neuman KC, Osheroff N. Use of divalent metal ions in the DNA cleavage reaction of topoisomerase IV. Nucleic Acids Res 2011; 39:4808-17. [PMID: 21300644 PMCID: PMC3113566 DOI: 10.1093/nar/gkr018] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
It has long been known that type II topoisomerases require divalent metal ions in order to cleave DNA. Kinetic, mutagenesis and structural studies indicate that the eukaryotic enzymes utilize a novel variant of the canonical two-metal-ion mechanism to promote DNA scission. However, the role of metal ions in the cleavage reaction mediated by bacterial type II enzymes has been controversial. Therefore, to resolve this critical issue, this study characterized the DNA cleavage reaction of Escherichia coli topoisomerase IV. We utilized a series of divalent metal ions with varying thiophilicities in conjunction with oligonucleotides that replaced bridging and non-bridging oxygen atoms at (and near) the scissile bond with sulfur atoms. DNA scission was enhanced when thiophilic metal ions were used with substrates that contained bridging sulfur atoms. In addition, the metal-ion dependence of DNA cleavage was sigmoidal in nature, and rates and levels of DNA cleavage increased when metal ion mixtures were used in reactions. Based on these findings, we propose that topoisomerase IV cleaves DNA using a two-metal-ion mechanism in which one of the metal ions makes a critical interaction with the 3′-bridging atom of the scissile phosphate and facilitates DNA scission by the bacterial type II enzyme.
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Affiliation(s)
- Steven L Pitts
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA
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25
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Mouw KW, Steiner AM, Ghirlando R, Li NS, Rowland SJ, Boocock MR, Stark WM, Piccirilli JA, Rice PA. Sin resolvase catalytic activity and oligomerization state are tightly coupled. J Mol Biol 2010; 404:16-33. [PMID: 20868695 DOI: 10.1016/j.jmb.2010.08.057] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2008] [Revised: 08/18/2010] [Accepted: 08/30/2010] [Indexed: 11/18/2022]
Abstract
Serine recombinases promote specific DNA rearrangements by a cut-and-paste mechanism that involves cleavage of all four DNA strands at two sites recognized by the enzyme. Dissecting the order and timing of these cleavage events and the steps leading up to them is difficult because the cleavage reaction is readily reversible. Here, we describe assays using activated Sin mutants and a DNA substrate with a 3'-bridging phosphorothiolate modification that renders Sin-mediated DNA cleavage irreversible. We find that activating Sin mutations promote DNA cleavage rather than simply stabilize the cleavage product. Cleavage events at the scissile phosphates on complementary strands of the duplex are tightly coupled, and the overall DNA cleavage rate is strongly dependent on Sin concentration. When combined with analytical ultracentrifugation data, these results suggest that Sin catalytic activity and oligomerization state are tightly linked, and that activating mutations promote formation of a cleavage-competent oligomeric state that is normally formed only transiently within the full synaptic complex.
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Affiliation(s)
- Kent W Mouw
- Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL 60637, USA
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26
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Schmidt BH, Burgin AB, Deweese JE, Osheroff N, Berger JM. A novel and unified two-metal mechanism for DNA cleavage by type II and IA topoisomerases. Nature 2010; 465:641-4. [PMID: 20485342 PMCID: PMC2882514 DOI: 10.1038/nature08974] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Revised: 06/03/2010] [Accepted: 03/01/2010] [Indexed: 11/09/2022]
Abstract
Type II topoisomerases are required for the management of DNA tangles and supercoils, and are targets of clinical antibiotics and anti-cancer agents. These enzymes catalyse the ATP-dependent passage of one DNA duplex (the transport or T-segment) through a transient, double-stranded break in another (the gate or G-segment), navigating DNA through the protein using a set of dissociable internal interfaces, or 'gates'. For more than 20 years, it has been established that a pair of dimer-related tyrosines, together with divalent cations, catalyse G-segment cleavage. Recent efforts have proposed that strand scission relies on a 'two-metal mechanism', a ubiquitous biochemical strategy that supports vital cellular processes ranging from DNA synthesis to RNA self-splicing. Here we present the structure of the DNA-binding and cleavage core of Saccharomyces cerevisiae topoisomerase II covalently linked to DNA through its active-site tyrosine at 2.5A resolution, revealing for the first time the organization of a cleavage-competent type II topoisomerase configuration. Unexpectedly, metal-soaking experiments indicate that cleavage is catalysed by a novel variation of the classic two-metal approach. Comparative analyses extend this scheme to explain how distantly-related type IA topoisomerases cleave single-stranded DNA, unifying the cleavage mechanisms for these two essential enzyme families. The structure also highlights a hitherto undiscovered allosteric relay that actuates a molecular 'trapdoor' to prevent subunit dissociation during cleavage. This connection illustrates how an indispensable chromosome-disentangling machine auto-regulates DNA breakage to prevent the aberrant formation of mutagenic and cytotoxic genomic lesions.
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Affiliation(s)
- Bryan H Schmidt
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA
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27
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Abstract
Type II topoisomerases are essential enzymes that regulate DNA under- and overwinding and remove knots and tangles from the genetic material. In order to carry out their critical physiological functions, these enzymes utilize a double-stranded DNA passage mechanism that requires them to generate a transient double-stranded break. Consequently, while necessary for cell survival, type II topoisomerases also have the capacity to fragment the genome. This feature of the prokaryotic and eukaryotic enzymes, respectively, is exploited to treat a variety of bacterial infections and cancers in humans. All type II topoisomerases require divalent metal ions for catalytic function. These metal ions function in two separate active sites and are necessary for the ATPase and DNA cleavage/ligation activities of the enzymes. ATPase activity is required for the strand passage process and utilizes the metal-dependent binding and hydrolysis of ATP to drive structural rearrangements in the protein. Both the DNA cleavage and ligation activities of type II topoisomerases require divalent metal ions and appear to utilize a novel variant of the canonical two-metal-ion phosphotransferase/hydrolase mechanism to facilitate these reactions. This article will focus primarily on eukaryotic type II topoisomerases and the roles of metal ions in the catalytic functions of these enzymes.
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Affiliation(s)
- Joseph E Deweese
- Department of Pharmaceutical Sciences, Lipscomb University College of Pharmacy, Nashville, TN 37204-3951, USA
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28
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Deweese JE, Guengerich FP, Burgin AB, Osheroff N. Metal ion interactions in the DNA cleavage/ligation active site of human topoisomerase IIalpha. Biochemistry 2009; 48:8940-7. [PMID: 19697956 DOI: 10.1021/bi900875c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Human topoisomerase IIalpha utilizes a two-metal-ion mechanism for DNA cleavage. One of the metal ions (M(1)(2+)) is believed to make a critical interaction with the 3'-bridging atom of the scissile phosphate, while the other (M(2)(2+)) is believed to interact with a nonbridging oxygen of the scissile phosphate. Based on structural and mutagenesis studies of prokaryotic nucleic acid enzymes, it has been proposed that the active site divalent metal ions interact with type II topoisomerases through a series of conserved acidic amino acid residues. The homologous residues in human topoisomerase IIalpha are E461, D541, D543, and D545. To address the validity of these assignments and to delineate interactions between individual amino acids and M(1)(2+) and M(2)(2+), we individually mutated each of these acidic amino acid residues in topoisomerase IIalpha to either cysteine or alanine. Mutant enzymes displayed a marked loss of catalytic and DNA cleavage activity as well as a reduced affinity for divalent metal ions. Additional experiments determined the ability of wild-type and mutant topoisomerase IIalpha enzymes to cleave an oligonucleotide substrate that contained a sulfur atom in place of the 3'-bridging oxygen of the scissile phosphate in the presence of Mg2+, Mn2+, or Ca2+. On the basis of the results of these studies, we conclude that the four acidic amino acid residues interact with metal ions in the DNA cleavage/ligation active site of topoisomerase IIalpha. Furthermore, we propose that M(1)(2+) interacts with E461, D543, and D545 and M(2)(2+) interacts with E461 and D541.
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Affiliation(s)
- Joseph E Deweese
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA
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29
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The DNA-gate of Bacillus subtilis gyrase is predominantly in the closed conformation during the DNA supercoiling reaction. Proc Natl Acad Sci U S A 2009; 106:13278-83. [PMID: 19666507 DOI: 10.1073/pnas.0902493106] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Gyrase is the only type II topoisomerase that introduces negative supercoils into DNA. Supercoiling is catalyzed via a strand-passage mechanism, in which the gate DNA (gDNA) is transiently cleaved, and a second DNA segment, the transfer DNA (tDNA), is passed through the gap before the gDNA is religated. Strand passage requires an opening of the so-called DNA-gate by approximately 2 nm. A single-molecule FRET study reported equal populations of open and closed DNA-gate in topoisomerase II. We present here single-molecule FRET experiments that monitor the conformation of DNA bound to the DNA-gate of Bacillus subtilis gyrase and the conformation of the DNA-gate itself. DNA bound to gyrase adopts two different conformations, one slightly, one severely distorted. DNA distortion requires cleavage, but neither ATP nor the presence of a tDNA. At the same time, the DNA-gate of gyrase is predominantly in the closed conformation. In agreement with the single molecule data and with the danger of dsDNA breaks for genome integrity, <5% of cleavage complexes are detected in equilibrium. Quinolone inhibitors favor DNA cleavage by B. subtilis gyrase, but disfavor DNA distortion, and the DNA-gate remains in the closed conformation. Our results demonstrate that DNA binding, distortion and cleavage, and gate-opening are mechanistically distinct events. During the relaxation and supercoiling reactions, gyrase with an open DNA-gate is not significantly populated, consistent with gate-opening as a very rare event that only occurs briefly to allow for strand passage.
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Deweese JE, Burch AM, Burgin AB, Osheroff N. Use of divalent metal ions in the dna cleavage reaction of human type II topoisomerases. Biochemistry 2009; 48:1862-9. [PMID: 19222228 DOI: 10.1021/bi8023256] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
All type II topoisomerases require divalent metal ions to cleave and ligate DNA. To further elucidate the mechanistic basis for these critical enzyme-mediated events, the role of the metal ion in the DNA cleavage reaction of human topoisomerase IIbeta was characterized and compared to that of topoisomerase IIalpha. This study utilized divalent metal ions with varying thiophilicities in conjunction with DNA cleavage substrates that substituted a sulfur atom for the 3'-bridging oxygen or the nonbridging oxygens of the scissile phosphate. On the basis of time courses of DNA cleavage, cation titrations, and metal ion mixing experiments, we propose the following model for the use of divalent metal ions by human type II topoisomerases. First, both enzymes employ a two-metal ion mechanism to support DNA cleavage. Second, an interaction between one divalent metal ion and the 3'-bridging atom of the scissile phosphate greatly enhances enzyme-mediated DNA cleavage, most likely by stabilizing the leaving 3'-oxygen. Third, there is an important interaction between a divalent second metal ion and a nonbridging atom of the scissile phosphate that stimulates DNA cleavage mediated by topoisomerase IIbeta. If this interaction exists in topoisomerase IIalpha, its effects on DNA cleavage are equivocal. This last aspect of the model highlights a difference in metal ion utilization during DNA cleavage mediated by human topoisomerase IIalpha and IIbeta.
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Affiliation(s)
- Joseph E Deweese
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA
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31
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Deweese JE, Osheroff N. Coordinating the two protomer active sites of human topoisomerase IIalpha: nicks as topoisomerase II poisons. Biochemistry 2009; 48:1439-41. [PMID: 19166355 DOI: 10.1021/bi8021679] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Topoisomerase II modulates DNA topology by generating double-stranded breaks in DNA. Results of the current study indicate that the presence of a nick at one scissile bond dramatically increases the rate of cleavage by human topoisomerase IIalpha at the scissile bond on the opposite strand. We propose that this enhanced activity at the second strand coordinates the two protomer subunits of topoisomerase II and allows the enzyme to create double-stranded breaks. Finally, the presence of a nick on one strand induces cleavage on the opposite strand. Thus, nicks are topoisomerase II poisons that generate novel sites of DNA cleavage.
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Affiliation(s)
- Joseph E Deweese
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA
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Deweese JE, Osheroff N. The DNA cleavage reaction of topoisomerase II: wolf in sheep's clothing. Nucleic Acids Res 2008; 37:738-48. [PMID: 19042970 PMCID: PMC2647315 DOI: 10.1093/nar/gkn937] [Citation(s) in RCA: 334] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Topoisomerase II is an essential enzyme that is required for virtually every process that requires movement of DNA within the nucleus or the opening of the double helix. This enzyme helps to regulate DNA under- and overwinding and removes knots and tangles from the genetic material. In order to carry out its critical physiological functions, topoisomerase II generates transient double-stranded breaks in DNA. Consequently, while necessary for cell survival, the enzyme also has the capacity to fragment the genome. The DNA cleavage/ligation reaction of topoisomerase II is the target for some of the most successful anticancer drugs currently in clinical use. However, this same reaction also is believed to trigger chromosomal translocations that are associated with specific types of leukemia. This article will familiarize the reader with the DNA cleavage/ligation reaction of topoisomerase II and other aspects of its catalytic cycle. In addition, it will discuss the interaction of the enzyme with anticancer drugs and the mechanisms by which these agents increase levels of topoisomerase II-generated DNA strand breaks. Finally, it will describe dietary and environmental agents that enhance DNA cleavage mediated by the enzyme.
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Affiliation(s)
- Joseph E Deweese
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146 USA
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Deweese JE, Burgin AB, Osheroff N. Human topoisomerase IIalpha uses a two-metal-ion mechanism for DNA cleavage. Nucleic Acids Res 2008; 36:4883-93. [PMID: 18653531 PMCID: PMC2528187 DOI: 10.1093/nar/gkn466] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The DNA cleavage reaction of human topoisomerase IIα is critical to all of the physiological and pharmacological functions of the protein. While it has long been known that the type II enzyme requires a divalent metal ion in order to cleave DNA, the role of the cation in this process is not known. To resolve this fundamental issue, the present study utilized a series of divalent metal ions with varying thiophilicities in conjunction with DNA cleavage substrates that replaced the 3′-bridging oxygen of the scissile bond with a sulfur atom (i.e. 3′-bridging phosphorothiolates). Rates and levels of DNA scission were greatly enhanced when thiophilic metal ions were included in reactions that utilized sulfur-containing substrates. Based on these results and those of reactions that employed divalent cation mixtures, we propose that topoisomerase IIα mediates DNA cleavage via a two-metal-ion mechanism. In this model, one of the metal ions makes a critical interaction with the 3′-bridging atom of the scissile phosphate. This interaction greatly accelerates rates of enzyme-mediated DNA cleavage, and most likely is needed to stabilize the leaving 3′-oxygen.
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Affiliation(s)
- Joseph E Deweese
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA
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