1
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Wang X, Chandrasekaran AR, Shen Z, Ohayon YP, Wang T, Kizer ME, Sha R, Mao C, Yan H, Zhang X, Liao S, Ding B, Chakraborty B, Jonoska N, Niu D, Gu H, Chao J, Gao X, Li Y, Ciengshin T, Seeman NC. Paranemic Crossover DNA: There and Back Again. Chem Rev 2018; 119:6273-6289. [PMID: 29911864 DOI: 10.1021/acs.chemrev.8b00207] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Over the past 35 years, DNA has been used to produce various nanometer-scale constructs, nanomechanical devices, and walkers. Construction of complex DNA nanostructures relies on the creation of rigid DNA motifs. Paranemic crossover (PX) DNA is one such motif that has played many roles in DNA nanotechnology. Specifically, PX cohesion has been used to connect topologically closed molecules, to assemble a three-dimensional object, and to create two-dimensional DNA crystals. Additionally, a sequence-dependent nanodevice based on conformational change between PX and its topoisomer, JX2, has been used in robust nanoscale assembly lines, as a key component in a DNA transducer, and to dictate polymer assembly. Furthermore, the PX motif has recently found a new role directly in basic biology, by possibly serving as the molecular structure for double-stranded DNA homology recognition, a prominent feature of molecular biology and essential for many crucial biological processes. This review discusses the many attributes and usages of PX-DNA-its design, characteristics, applications, and potential biological relevance-and aims to accelerate the understanding of PX-DNA motif in its many roles and manifestations.
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Affiliation(s)
- Xing Wang
- Department of Chemistry and Chemical Biology and The Center for Biotechnology and Interdisciplinary Studies , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
| | | | - Zhiyong Shen
- College of Chemistry and Materials Science , Anhui Normal University , Wuhu , Anhui 241000 , China
| | - Yoel P Ohayon
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Tong Wang
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Megan E Kizer
- Department of Chemistry and Chemical Biology and The Center for Biotechnology and Interdisciplinary Studies , Rensselaer Polytechnic Institute , Troy , New York 12180 , United States
| | - Ruojie Sha
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Chengde Mao
- Department of Chemistry , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Hao Yan
- Department of Chemistry and Biochemistry and The Biodesign Institute , Arizona State University , Tempe , Arizona 85287 , United States
| | - Xiaoping Zhang
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Shiping Liao
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Baoquan Ding
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Banani Chakraborty
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Natasha Jonoska
- Department of Mathematics and Statistics , University of South Florida , Tampa , Florida 33620 , United States
| | - Dong Niu
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Hongzhou Gu
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Jie Chao
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Xiang Gao
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Yuhang Li
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Tanashaya Ciengshin
- Department of Chemistry , New York University , New York , New York 10012 , United States
| | - Nadrian C Seeman
- Department of Chemistry , New York University , New York , New York 10012 , United States
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2
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The RecA/RAD51 protein drives migration of Holliday junctions via polymerization on DNA. Proc Natl Acad Sci U S A 2011; 108:6432-7. [PMID: 21464277 DOI: 10.1073/pnas.1016072108] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The Holliday junction (HJ), a cross-shaped structure that physically links the two DNA helices, is a key intermediate in homologous recombination, DNA repair, and replication. Several helicase-like proteins are known to bind HJs and promote their branch migration (BM) by translocating along DNA at the expense of ATP hydrolysis. Surprisingly, the bacterial recombinase protein RecA and its eukaryotic homologue Rad51 also promote BM of HJs despite the fact they do not bind HJs preferentially and do not translocate along DNA. RecA/Rad51 plays a key role in DNA double-stranded break repair and homologous recombination. RecA/Rad51 binds to ssDNA and forms contiguous filaments that promote the search for homologous DNA sequences and DNA strand exchange. The mechanism of BM promoted by RecA/RAD51 is unknown. Here, we demonstrate that cycles of RecA/Rad51 polymerization and dissociation coupled with ATP hydrolysis drives the BM of HJs.
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3
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Abstract
Homologous recombination (HR) performs crucial functions including DNA repair, segregation of homologous chromosomes, propagation of genetic diversity, and maintenance of telomeres. HR is responsible for the repair of DNA double-strand breaks and DNA interstrand cross-links. The process of HR is initiated at the site of DNA breaks and gaps and involves a search for homologous sequences promoted by Rad51 and auxiliary proteins followed by the subsequent invasion of broken DNA ends into the homologous duplex DNA that then serves as a template for repair. The invasion produces a cross-stranded structure, known as the Holliday junction. Here, we describe the properties of Rad54, an important and versatile HR protein that is evolutionarily conserved in eukaryotes. Rad54 is a motor protein that translocates along dsDNA and performs several important functions in HR. The current review focuses on the recently identified Rad54 activities which contribute to the late phase of HR, especially the branch migration of Holliday junctions.
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Affiliation(s)
- Alexander V Mazin
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA 19102, USA.
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4
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Shen Z, Yan H, Wang T, Seeman NC. Paranemic crossover DNA: a generalized Holliday structure with applications in nanotechnology. J Am Chem Soc 2004; 126:1666-74. [PMID: 14871096 PMCID: PMC3737428 DOI: 10.1021/ja038381e] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Paranemic crossover (PX) DNA is a four-stranded coaxial DNA complex containing a central dyad axis that relates two flanking parallel double helices. The strands are held together exclusively by Watson-Crick base pairing. The key feature of the structure is that the two adjacent parallel DNA double helices form crossovers at every point possible. Hence, reciprocal crossover points flank the central dyad axis at every major or minor groove separation. This motif has been modeled and characterized in an oligonucleotide system; a minor groove separation of five nucleotide pairs and major groove separations of six, seven, or eight nucleotide pairs produce stable PX DNA molecules; a major groove separation of 9 nucleotide pairs is possible at low concentrations. Every strand undergoes a crossover every helical repeat (11, 12, 13, or 14 nucleotides), but the structural period of each strand corresponds to two helical repeats (22, 24, 26, or 28 nucleotides). Nondenaturing gel electrophoresis shows that the molecules are stable, forming well-behaved complexes. PX DNA can be produced from closed dumbbells, demonstrating that the molecule is paranemic. Ferguson analysis indicates that the molecules are similar in shape to DNA double crossover molecules. Circular dichroism spectra are consistent with B-form DNA. Thermal transition profiles suggest a premelting transition in each of the molecules. Hydroxyl radical autofootprinting analysis confirms that there is a crossover point at each of the positions expected in the secondary structure. These molecules are generalized Holliday junctions.
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Affiliation(s)
- Zhiyong Shen
- Department of Chemistry, New York University, New York, NY 10003
| | - Hao Yan
- Department of Chemistry, New York University, New York, NY 10003
| | - Tong Wang
- Department of Chemistry, New York University, New York, NY 10003
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5
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Cai L, Marquardt U, Zhang Z, Taisey MJ, Chen J. Topological testing of the mechanism of homology search promoted by RecA protein. Nucleic Acids Res 2001; 29:1389-98. [PMID: 11239006 PMCID: PMC29744 DOI: 10.1093/nar/29.6.1389] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2000] [Revised: 01/08/2001] [Accepted: 01/08/2001] [Indexed: 11/12/2022] Open
Abstract
To initiate homologous recombination, sequence similarity between two DNA molecules must be searched for and homology recognized. How the search for and recognition of homology occurs remains unproven. We have examined the influences of DNA topology and the polarity of RecA-single-stranded (ss)DNA filaments on the formation of synaptic complexes promoted by RecA. Using two complementary methods and various ssDNA and duplex DNA molecules as substrates, we demonstrate that topological constraints on a small circular RecA-ssDNA filament prevent it from interwinding with its duplex DNA target at the homologous region. We were unable to detect homologous pairing between a circular RecA-ssDNA filament and its relaxed or supercoiled circular duplex DNA targets. However, the formation of synaptic complexes between an invading linear RecA-ssDNA filament and covalently closed circular duplex DNAs is promoted by supercoiling of the duplex DNA. The results imply that a triplex structure formed by non-Watson-Crick hydrogen bonding is unlikely to be an intermediate in homology searching promoted by RecA. Rather, a model in which RecA-mediated homology searching requires unwinding of the duplex DNA coupled with local strand exchange is the likely mechanism. Furthermore, we show that polarity of the invading RecA-ssDNA does not affect its ability to pair and interwind with its circular target duplex DNA.
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Affiliation(s)
- L Cai
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA
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6
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Zaitsev EN, Kowalczykowski SC. A novel pairing process promoted by Escherichia coli RecA protein: inverse DNA and RNA strand exchange. Genes Dev 2000. [DOI: 10.1101/gad.14.6.740] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Traditionally, recombination reactions promoted by RecA-like proteins initiate by forming a nucleoprotein filament on a single-stranded DNA (ssDNA), which then pairs with homologous double-stranded DNA (dsDNA). In this paper, we describe a novel pairing process that occurs in an unconventional manner: RecA protein polymerizes along dsDNA to form an active nucleoprotein filament that can pair and exchange strands with homologous ssDNA. Our results demonstrate that this “inverse” reaction is a unique, highly efficient DNA strand exchange reaction that is not due to redistribution of RecA protein from dsDNA to the homologous ssDNA partner. Finally, we demonstrate that the RecA protein–dsDNA filament can also pair and promote strand exchange with ssRNA. This inverse RNA strand exchange reaction is likely responsible for R-loop formation that is required for recombination-dependent DNA replication.
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7
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Zaitsev EN, Kowalczykowski SC. The simultaneous binding of two double-stranded DNA molecules by Escherichia coli RecA protein. J Mol Biol 1999; 287:21-31. [PMID: 10074404 DOI: 10.1006/jmbi.1998.2580] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have characterized the double-stranded DNA (dsDNA) binding properties of RecA protein, using an assay based on changes in the fluorescence of 4',6-diamidino-2-phenylindole (DAPI)-dsDNA complexes. Here we use fluorescence, nitrocellulose filter-binding, and DNase I-sensitivity assays to demonstrate the binding of two duplex DNA molecules by the RecA protein filament. We previously established that the binding stoichiometry for the RecA protein-dsDNA complex is three base-pairs per RecA protein monomer, in the presence of ATP. In the presence of ATPgammaS, however, the binding stoichiometry depends on the MgCl2 concentration. The stoichiometry is 3 bp per monomer at low MgCl2 concentrations, but changes to 6 bp per monomer at higher MgCl2 concentrations, with the transition occurring at approximately 5 mM MgCl2. Above this MgCl2 concentration, the dsDNA within the RecA nucleoprotein complex becomes uncharacteristically sensitive to DNase I digestion. For these reasons we suggest that, at the elevated MgCl2 conditions, the RecA-dsDNA nucleoprotein filament can bind a second equivalent of dsDNA. These results demonstrate that RecA protein has the capacity to bind two dsDNA molecules, and they suggest that RecA or RecA-like proteins may effect homologous recognition between intact DNA duplexes.
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Affiliation(s)
- E N Zaitsev
- Sections of Microbiology and of Molecular and Cell Biology, University of California, Davis, CA, 95616-8665, USA
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8
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Bilcock DT, Halford SE. DNA restriction dependent on two recognition sites: activities of the SfiI restriction-modification system in Escherichia coli. Mol Microbiol 1999; 31:1243-54. [PMID: 10096090 DOI: 10.1046/j.1365-2958.1999.01266.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In contrast to many type II restriction enzymes, dimeric proteins that cleave DNA at individual recognition sites 4-6 bp long, the SfiI endonuclease is a tetrameric protein that binds to two copies of an elongated sequence before cutting the DNA at both sites. The mode of action of the SfiI endonuclease thus seems more appropriate for DNA rearrangements than for restriction. To elucidate its biological function, strains of Escherichia coli expressing the SfiI restriction-modification system were transformed with plasmids carrying SfiI sites. The SfiI system often failed to restrict the survival of a plasmid with one SfiI site, but plasmids with two or more sites were restricted efficiently. Plasmids containing methylated SfI sites were not restricted. No rearrangements of the plasmids carrying SfiI sites were detected among the transformants. Hence, provided the target DNA contains at least two recognition sites, SfiI displays all of the hallmarks of a restriction-modification system as opposed to a recombination system in E. coli cells. The properties of the system in vivo match those of the enzyme in vitro. For both restriction in vivo and DNA cleavage in vitro, SfiI operates best with two recognition sites on the same DNA.
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Affiliation(s)
- D T Bilcock
- Department of Biochemistry, School of Medical Sciences, University of Bristol, UK
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9
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Shan Q, Cox MM. On the mechanism of RecA-mediated repair of double-strand breaks: no role for four-strand DNA pairing intermediates. Mol Cell 1998; 1:309-17. [PMID: 9659927 DOI: 10.1016/s1097-2765(00)80031-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
RecA protein will bind to a gapped duplex DNA molecule and promote a DNA strand exchange with a second homologous linear duplex. A double-strand break in the second duplex is efficiently bypassed in the course of these reactions. We demonstrate that the bypass of double-strand breaks is not explained by a mechanism involving homologous interactions between two duplex DNA molecules, but instead requires the ATP-mediated generation of DNA torsional stress brought about by the action of RecA. The results suggest new pathways for the repair of double-strand breaks and underline the need for new paradigms to explain the alignment of homologous DNAs during genetic recombination.
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Affiliation(s)
- Q Shan
- Department of Biochemistry, University of Wisconsin, Madison 53706, USA
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10
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Bazemore LR, Takahashi M, Radding CM. Kinetic analysis of pairing and strand exchange catalyzed by RecA. Detection by fluorescence energy transfer. J Biol Chem 1997; 272:14672-82. [PMID: 9169430 DOI: 10.1074/jbc.272.23.14672] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
RecA is a 38-kDa protein from Escherichia coli that polymerizes on single-stranded DNA, forming a nucleoprotein filament that pairs with homologous duplex DNA and carries out strand exchange in vitro. In this study, we measured RecA-catalyzed pairing and strand exchange in solution by energy transfer between fluorescent dyes on the ends of deoxyribo-oligonucleotides. By varying the position of the dyes in separate assays, we were able to detect the pairing of single-stranded RecA filament with duplex DNA as an increase in energy transfer, and strand displacement as a decrease in energy transfer. With these assays, the kinetics of pairing and strand displacement were studied by stopped-flow spectrofluorometry. The data revealed a rapid, second order, reversible pairing step that was followed by a slower, reversible, first order strand exchange step. These data indicate that an initial unstable intermediate exists which can readily return to reactants, and that a further, rate-limiting step (or steps) is required to effect or complete strand exchange.
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Affiliation(s)
- L R Bazemore
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06510, USA
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11
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12
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Kowalczykowski SC, Dixon DA, Eggleston AK, Lauder SD, Rehrauer WM. Biochemistry of homologous recombination in Escherichia coli. Microbiol Rev 1994; 58:401-65. [PMID: 7968921 PMCID: PMC372975 DOI: 10.1128/mr.58.3.401-465.1994] [Citation(s) in RCA: 778] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Homologous recombination is a fundamental biological process. Biochemical understanding of this process is most advanced for Escherichia coli. At least 25 gene products are involved in promoting genetic exchange. At present, this includes the RecA, RecBCD (exonuclease V), RecE (exonuclease VIII), RecF, RecG, RecJ, RecN, RecOR, RecQ, RecT, RuvAB, RuvC, SbcCD, and SSB proteins, as well as DNA polymerase I, DNA gyrase, DNA topoisomerase I, DNA ligase, and DNA helicases. The activities displayed by these enzymes include homologous DNA pairing and strand exchange, helicase, branch migration, Holliday junction binding and cleavage, nuclease, ATPase, topoisomerase, DNA binding, ATP binding, polymerase, and ligase, and, collectively, they define biochemical events that are essential for efficient recombination. In addition to these needed proteins, a cis-acting recombination hot spot known as Chi (chi: 5'-GCTGGTGG-3') plays a crucial regulatory function. The biochemical steps that comprise homologous recombination can be formally divided into four parts: (i) processing of DNA molecules into suitable recombination substrates, (ii) homologous pairing of the DNA partners and the exchange of DNA strands, (iii) extension of the nascent DNA heteroduplex; and (iv) resolution of the resulting crossover structure. This review focuses on the biochemical mechanisms underlying these steps, with particular emphases on the activities of the proteins involved and on the integration of these activities into likely biochemical pathways for recombination.
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Affiliation(s)
- S C Kowalczykowski
- Division of Biological Sciences, University of California, Davis 95616-8665
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Affiliation(s)
- R S Hawley
- Department of Genetics, University of California, Davis 95616
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14
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Affiliation(s)
- E C Conley
- Department of Biochemistry, University of Leicester, UK
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15
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Abstract
In Escherichia coli, the ruvA, ruvB and ruvC gene products are required for genetic recombination and the recombinational repair of DNA damage. New studies suggest that these three proteins function late in recombination and process Holliday junctions made by RecA protein-mediated strand exchange. In vitro, RuvA protein binds a Holliday junction with high affinity and, together with RuvB (an ATPase), promotes ATP-dependent branch migration of the junction leading to the formation of heteroduplex DNA. The third protein, RuvC, which acts independently of RuvA and RuvB, resolves recombination intermediates by specific endonucleolytic cleavage of the Holliday junction.
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Affiliation(s)
- S C West
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Hertfordshire, UK
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16
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Luisi-DeLuca C, Kolodner RD. Effect of terminal non-homology on intramolecular recombination of linear plasmid substrates in Escherichia coli. J Mol Biol 1992; 227:72-80. [PMID: 1522602 DOI: 10.1016/0022-2836(92)90682-a] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Circular dimer plasmids linearized with a restriction endonuclease undergo intramolecular recombination to yield recombinant circular monomers at high efficiency by a recA-independent mechanism in Escherichia coli recB recC sbcA mutants. The rate of this reaction is at least 1000-fold higher than the recombination rate observed for circular plasmid recombination substrates in the same mutants. Three potential models have been previously proposed to explain the recombination events observed. The validity of these models was tested in recA recB recC sbcA mutants using additional recombination substrates. These substrates, when linearized by incubation with an appropriate restriction enzyme, contain non-homologous adenovirus 2 DNA on one or both ends. The data indicate that terminal non-homology does not significantly affect the efficiency of recovering recombinants. In contrast to many recombination models proposed that involve the invasion of homologous duplex DNA by single-stranded DNA ends, the intramolecular recombination reaction studied here does not appear to involve direct pairing from the end(s) of the substrate DNA. Furthermore, the results are consistent with a model proposing that pairing and strand exchange occur between two homologous duplex regions within the linear dimer molecule.
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Affiliation(s)
- C Luisi-DeLuca
- Division of Cellular and Molecular Biology, Dana Farber Cancer Institute, Boston, MA
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17
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On the role of ATP hydrolysis in RecA protein-mediated DNA strand exchange. II. Four-strand exchanges. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(18)42023-6] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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18
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Putative three-stranded DNA pairing intermediate in recA protein-mediated DNA strand exchange: no role for guanine N-7. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(19)50650-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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19
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Chow SA, Chiu SK, Wong BC. RecA protein-promoted homologous pairing and strand exchange between intact and partially single-stranded duplex DNA. J Mol Biol 1992; 223:79-93. [PMID: 1530979 DOI: 10.1016/0022-2836(92)90717-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In the pairing reaction between circular gapped and fully duplex DNA, RecA protein first polymerizes on the gapped DNA to form a nucleoprotein filament. Conditions that removed the formation of secondary structure in the gapped DNA, such as addition of Escherichia coli single-stranded DNA binding protein or preincubation in 1 mM-MgCl2, optimized the binding of RecA protein and increased the formation of joint molecules. The gapped duplex formed stable joints with fully duplex DNA that had a 5' or 3' terminus complementary to the single-stranded region of the gapped molecule. However, the joints formed had distinct properties and structures depending on whether the complementary terminus was at the 5' or 3' end. Pairing between gapped DNA and fully duplex linear DNA with a 3' complementary terminus resulted in strand displacement, symmetric strand exchange and formation of complete strand exchange products. By contrast, pairing between gapped and fully duplex DNA with a 5' complementary terminus produced a joint that was restricted to the gapped region; there was no strand displacement or symmetric strand exchange. The joint formed in the latter reaction was likely a three-stranded intermediate rather than a heteroduplex with the classical Watson-Crick structure. We conclude that, as in the three-strand reaction, the process of strand exchange in the four-strand reaction is polar and progresses in a 5' to 3' direction with respect to the initiating strand. The present study provides further evidence that in both three-strand and four-strand systems the pairing and strand exchange reactions share a common mechanism.
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Affiliation(s)
- S A Chow
- Department of Biochemistry, University of Hong Kong
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20
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Dunderdale HJ, Benson FE, Parsons CA, Sharples GJ, Lloyd RG, West SC. Formation and resolution of recombination intermediates by E. coli RecA and RuvC proteins. Nature 1991; 354:506-10. [PMID: 1758493 DOI: 10.1038/354506a0] [Citation(s) in RCA: 196] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The recombination of DNA molecules has been reconstituted in vitro using two purified enzymes from Escherichia coli. RecA protein catalyses homologous pairing and strand exchange reactions to form intermediate DNA structures that are acted upon by RuvC. The newly identified RuvC protein resolves the intermediates by specific endonucleolytic cleavage to produce recombinant DNA molecules.
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Affiliation(s)
- H J Dunderdale
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Herts, UK
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21
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Krishna P, Morgan AR, van de Sande JH. Interaction of recA protein with left-handed Z-DNA. Biochem J 1991; 275 ( Pt 3):711-9. [PMID: 2039448 PMCID: PMC1150112 DOI: 10.1042/bj2750711] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The ability of recA protein to interact with a Z-DNA polymer, Br-poly(dG-dC), or M13 bacteriophage single-stranded DNA was investigated. RecA protein binds more avidly to Z-DNA than to single-stranded DNA in the absence of a nucleotide cofactor. This binding pattern changes in the presence of adenosine 5'-(gamma-thio)triphosphate (ATP[S]), however, such that the binding to Z-DNA decreases while binding to single-stranded DNA increases roughly 2-fold. When present together, the two forms of DNA compete with each other in the presence of ATP[S]. Experiments involving recA protein binding to recombinant plasmids showed neither a preferential binding of recA protein to the plasmid containing Z-DNA nor a similar effect of ATP[S] to that observed with the Z-DNA polymer. In contrast, maximal binding was obtained with a plasmid (linear or supercoiled) containing a polypurine.polypyrimidine insert, thus suggesting that recA protein displays sequence preferences in its interaction with DNA. The results of the present study provide no evidence that recA protein specifically interacts with or stabilizes the Z-DNA insert of a recombinant plasmid in the left-handed conformation.
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Affiliation(s)
- P Krishna
- Department of Medical Biochemistry, University of Calgary, Alberta, Canada
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22
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Ward P, Berns KI. In vitro rescue of an integrated hybrid adeno-associated virus/simian virus 40 genome. J Mol Biol 1991; 218:791-804. [PMID: 1850805 DOI: 10.1016/0022-2836(91)90267-a] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
In an in vitro simian virus 40 (SV40) DNA replication assay, we have observed excision of a hybrid adeno-associated virus (AAV)/SV40 insert from a plasmid construct. The excision was dependent on the presence of the palindromic AAV terminal repeat and greatly enhanced by the addition of the SV40 T antigen to the reaction. Analysis of the excision product supports a model in which the palindromic terminal sequences of AAV form a cruciform structure (equivalent to a Holliday recombination intermediate), which is cleaved and resealed so that the excision products are linear duplex pBR322 and linear duplex AAV/SV40 insert. Both the excised linear duplex pBR322 and the excised linear duplex AAV/SV40 insert have each terminus covalently crosslinked by one copy of the palindromic region of the AAV terminal repeat region folded on itself. The excision process may be a model system for cellular homologous recombination. The process as observed was either concomitant with or subsequent to DNA replication.
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Affiliation(s)
- P Ward
- Hearst Microbiology Research Center, Department of Microbiology, Cornell University Medical College, New York, NY 10021
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23
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Radding CM. Helical interactions in homologous pairing and strand exchange driven by RecA protein. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(19)67599-x] [Citation(s) in RCA: 132] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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24
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Nucleosomes on linear duplex DNA allow homologous pairing but prevent strand exchange promoted by RecA protein. Proc Natl Acad Sci U S A 1991; 88:1344-8. [PMID: 1996335 PMCID: PMC51014 DOI: 10.1073/pnas.88.4.1344] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
To understand the molecular basis of gene targeting, we have studied interactions of nucleoprotein filaments comprised of single-stranded DNA and RecA protein with chromatin templates reconstituted from linear duplex DNA and histones. We observed that for the chromatin templates with histone/DNA mass ratios of 0.8 and 1.6, the efficiency of homologous pairing was indistinguishable from that of naked duplex DNA but strand exchange was repressed. In contrast, the chromatin templates with a histone/DNA mass ratio of 9.0 supported neither homologous pairing nor strand exchange. The addition of histone H1, in stoichiometric amounts, to chromatin templates quells homologous pairing. The pairing of chromatin templates with nucleoprotein filaments of RecA protein-single-stranded DNA proceeded without the production of detectable networks of DNA, suggesting that coaggregates are unlikely to be the intermediates in homologous pairing. The application of these observations to strategies for gene targeting and their implications for models of genetic recombination are discussed.
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25
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Chow SA, Chiu SK, Wong BC. RecA protein-promoted homologous pairing between duplex molecules: functional role of duplex regions of gapped duplex DNA. Biochimie 1991; 73:157-61. [PMID: 1883879 DOI: 10.1016/0300-9084(91)90198-a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
RecA protein promotes homologous pairing and symmetrical strand exchange between partially single-stranded duplex DNA and fully duplex molecules. We constructed circular gapped DNA with a defined gap length and studied the pairing reaction between the gapped substrate and fully duplex DNA. RecA protein polymerizes onto the single-stranded and duplex regions of the gapped DNA to form a nucleoprotein filament. The formation of such filaments requires a stoichiometric amount of RecA protein. Both the rate and yield of joint molecule formation were reduced when the pairing reaction was carried out in the presence of a sub-saturating amount of RecA protein. The amount of RecA protein required for optimal pairing corresponds to the binding site size of RecA protein at saturation on duplex DNA. The result suggests that in the 4-stranded system the single-stranded as well as the duplex regions are involved in pairing. By using fully duplex DNA that shares different lengths and regions of homology with the gapped molecule, we directly showed that the duplex region of the gapped DNA increased both the rate and yield of joint molecule formation. The present study indicates that even though strand exchange in the 4-stranded system must require the presence of a single-stranded region, the pairing that occurs in duplex regions between DNA molecules is functionally significant and contributes to the overall activity of the gapped DNA.
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Affiliation(s)
- S A Chow
- Department of Biochemistry, University of Honk Kong
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26
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Affiliation(s)
- S C West
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Herts, UK
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27
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Chiu SK, Wong BC, Chow SA. Homologous pairing in duplex DNA regions and the formation of four-stranded paranemic joints promoted by RecA protein. Effects of gap length and negative superhelicity. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(17)45355-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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28
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Connolly B, West SC. Genetic recombination in Escherichia coli: Holliday junctions made by RecA protein are resolved by fractionated cell-free extracts. Proc Natl Acad Sci U S A 1990; 87:8476-80. [PMID: 2146685 PMCID: PMC54979 DOI: 10.1073/pnas.87.21.8476] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Escherichia coli RecA protein catalyzes reciprocal strand-exchange reactions between duplex DNA molecules, provided that one contains a single-stranded gap or tail, to form recombination intermediates containing Holliday junctions. Recombination reactions are thought to occur within helical RecA-nucleoprotein filaments in which DNA molecules are interwound. Structures generated in vitro by RecA protein have been used to detect an activity from fractionated E. coli extracts that resolves the intermediates into heteroduplex recombinant products. Resolution occurs by specific endonucleolytic cleavage at the Holliday junction. The products of cleavage are characteristic of patch and splice recombinants.
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Affiliation(s)
- B Connolly
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Herts, United Kingdom
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29
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Lindsley JE, Cox MM. On RecA protein-mediated homologous alignment of two DNA molecules. Three strands versus four strands. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(19)38794-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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30
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Conley EC, West SC. Underwinding of DNA associated with duplex-duplex pairing by RecA protein. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(19)38793-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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31
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Müller B, Koller T, Stasiak A. Characterization of the DNA binding activity of stable RecA-DNA complexes. Interaction between the two DNA binding sites within RecA helical filaments. J Mol Biol 1990; 212:97-112. [PMID: 2319601 DOI: 10.1016/0022-2836(90)90307-8] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The DNA-binding, annealing and recombinational activities of purified RecA-DNA complexes stabilized by ATP gamma S (a slowly hydrolysable analog of ATP) are described. Electrophoretic analysis, DNase protection experiments and observations by electron microscopy suggest that saturated RecA complexes formed with single- or double-stranded DNA are able to accommodate an additional single strand of DNA with a stoichiometry of about one nucleotide of added single-stranded DNA per nucleotide or base-pair, respectively, of DNA resident in the complex. This strand uptake is independent of complementarity or homology between the added and resident DNA molecules. In the complex, the incoming and resident single-stranded DNA molecules are in close proximity as the two strands can anneal in case of their complementarity. Stable RecA complexes formed with single-stranded DNA bind double-stranded DNA efficiently when the added DNA is homologous to the complexed strand and then initiate a strand exchange reaction between the partner DNA molecules. Electron microscopy of the RecA-single-stranded DNA complexes associated with homologous double-stranded DNA suggests that a portion of duplex DNA is taken into the complex and placed in register with the resident single strand. Our experiments indicate that both DNA binding sites within RecA helical filaments can be occupied by either single- or double-stranded DNA. Presumably, the same first DNA binding site is used by RecA during its polymerization on single- or double-stranded DNA and the second DNA binding site becomes available for subsequent interaction of the protein-saturated complexes with naked DNA. The way by which additional DNA is taken into RecA-DNA complexes shows co-operative character and this helps to explain how topological problems are avoided during RecA-mediated homologous recombination.
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Affiliation(s)
- B Müller
- Institute of Cell Biology, ETH-Hönggerberg, Zürich, Switzerland
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32
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The Z-DNA motif d(TG)30 promotes reception of information during gene conversion events while stimulating homologous recombination in human cells in culture. Mol Cell Biol 1990. [PMID: 2405255 DOI: 10.1128/mcb.10.2.785] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Tracts of the alternating dinucleotide polydeoxythymidylic-guanylic [d(TG)].polydeoxyadenylic-cytidylic acid [d(AC)], present throughout the human genome, are capable of readily forming left-handed Z-DNA in vitro. We have analyzed the effects of the Z-DNA motif d(TG)30 upon homologous recombination between two nonreplicating plasmid substrates cotransfected into human cells in culture. In this study, the sequence d(TG)30 is shown to stimulate homologous recombination up to 20-fold. Enhancement is specific to the Z-DNA motif; a control DNA fragment of similar size does not alter the recombination frequency. The stimulation of recombination is observed at a distance (237 to 1,269 base pairs away from the Z-DNA motif) and involves both gene conversion and reciprocal exchange events. Maximum stimulation is observed when the sequence is present in both substrates, but it is capable of stimulating when present in only one substrate. Analysis of recombination products indicates that the Z-DNA motif increases the frequency and alters the distribution of multiple, unselected recombination events. Specifically designed crosses indicate that the substrate containing the Z-DNA motif preferentially acts as the recipient of genetic information during gene conversion events. Models describing how left-handed Z-DNA sequences might promote the initiation of homologous recombination are presented.
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33
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The Z-DNA motif d(TG)30 promotes reception of information during gene conversion events while stimulating homologous recombination in human cells in culture. Mol Cell Biol 1990; 10:785-93. [PMID: 2405255 PMCID: PMC360879 DOI: 10.1128/mcb.10.2.785-793.1990] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Tracts of the alternating dinucleotide polydeoxythymidylic-guanylic [d(TG)].polydeoxyadenylic-cytidylic acid [d(AC)], present throughout the human genome, are capable of readily forming left-handed Z-DNA in vitro. We have analyzed the effects of the Z-DNA motif d(TG)30 upon homologous recombination between two nonreplicating plasmid substrates cotransfected into human cells in culture. In this study, the sequence d(TG)30 is shown to stimulate homologous recombination up to 20-fold. Enhancement is specific to the Z-DNA motif; a control DNA fragment of similar size does not alter the recombination frequency. The stimulation of recombination is observed at a distance (237 to 1,269 base pairs away from the Z-DNA motif) and involves both gene conversion and reciprocal exchange events. Maximum stimulation is observed when the sequence is present in both substrates, but it is capable of stimulating when present in only one substrate. Analysis of recombination products indicates that the Z-DNA motif increases the frequency and alters the distribution of multiple, unselected recombination events. Specifically designed crosses indicate that the substrate containing the Z-DNA motif preferentially acts as the recipient of genetic information during gene conversion events. Models describing how left-handed Z-DNA sequences might promote the initiation of homologous recombination are presented.
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34
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Abstract
E. coli RecA protein promotes homologous pairing and reciprocal strand exchange reactions between duplex DNA molecules in vitro. Reaction intermediates contain Holliday junctions that are driven along the DNA at a maximal rate approaching 1000 bases per minute. T4 endonuclease VII cleaves Holliday junctions in vitro, and its inclusion in RecA-mediated reactions leads to the rapid formation of heteroduplex products. Product analysis indicates patch and splice recombinant molecules similar to those expected from in vivo recombination events. The combined formation and resolution of Holliday junctions has led us to propose a model for resolution based on the structure of RecA-DNA helices. One feature of this model is that resolution, which gives rise to the two types of recombinant product, may occur without need for isomerization of the junction.
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Affiliation(s)
- B Müller
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Hertfordshire, England
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35
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Affiliation(s)
- A I Roca
- Department of Biochemistry, University of Wisconsin-Madison 53706
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36
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Radding CM. Helical RecA nucleoprotein filaments mediate homologous pairing and strand exchange. BIOCHIMICA ET BIOPHYSICA ACTA 1989; 1008:131-45. [PMID: 2660904 DOI: 10.1016/0167-4781(80)90001-9] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- C M Radding
- Departments of Human Genetics and Molecular Biochemistry, Yale University School of Medicine, New Haven, CT
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