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Coletti A, Newhall KA, Walker BL, Bloom K. Different relative scalings between transient forces and thermal fluctuations tune regimes of chromatin organization. ARXIV 2024:arXiv:2401.06921v2. [PMID: 38979491 PMCID: PMC11230345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 07/10/2024]
Abstract
Within the nucleus, structural maintenance of chromosome protein complexes, namely condensin and cohesin, create an architecture to facilitate the organization and proper function of the genome. Condensin, in addition to performing loop extrusion, creates localized clusters of chromatin in the nucleolus through transient crosslinks. Large-scale simulations revealed three different dynamic behaviors as a function of timescale: slow crosslinking leads to no clusters, fast crosslinking produces rigid slowly changing clusters, while intermediate timescales produce flexible clusters that mediate gene interaction. By mathematically analyzing different relative scalings of the two sources of stochasticity, thermal fluctuations and the force induced by the transient crosslinks, we predict these three distinct regimes of cluster behavior. Standard time-averaging that takes the fluctuations of the transient crosslink force to zero predicts the existence of rigid clusters. Accounting for the interaction of both fluctuations from the crosslinks and thermal noise with an effective energy landscape predicts the timescale-dependent lifetimes of flexible clusters. No clusters are predicted when the fluctuations of the transient crosslink force are taken to be large relative to thermal fluctuations. This mathematical perturbation analysis illuminates the importance of accounting for stochasticity in local incoherent transient forces to predict emergent complex biological behavior.
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Affiliation(s)
- Anna Coletti
- Department of Mathematics, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27510
| | - Katherine A. Newhall
- Department of Mathematics, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27510
| | - Benjamin L. Walker
- Department of Mathematics, University of California, Irvine, Irvine, CA, 92697
| | - Kerry Bloom
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27510
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2
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Molza AE, Westermaier Y, Moutte M, Ducrot P, Danilowicz C, Godoy-Carter V, Prentiss M, Robert CH, Baaden M, Prévost C. Building Biological Relevance Into Integrative Modelling of Macromolecular Assemblies. Front Mol Biosci 2022; 9:826136. [PMID: 35480882 PMCID: PMC9035671 DOI: 10.3389/fmolb.2022.826136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 02/21/2022] [Indexed: 01/25/2023] Open
Abstract
Recent advances in structural biophysics and integrative modelling methods now allow us to decipher the structures of large macromolecular assemblies. Understanding the dynamics and mechanisms involved in their biological function requires rigorous integration of all available data. We have developed a complete modelling pipeline that includes analyses to extract biologically significant information by consistently combining automated and interactive human-guided steps. We illustrate this idea with two examples. First, we describe the ryanodine receptor, an ion channel that controls ion flux across the cell membrane through transitions between open and closed states. The conformational changes associated with the transitions are small compared to the considerable system size of the receptor; it is challenging to consistently track these states with the available cryo-EM structures. The second example involves homologous recombination, in which long filaments of a recombinase protein and DNA catalyse the exchange of homologous DNA strands to reliably repair DNA double-strand breaks. The nucleoprotein filament reaction intermediates in this process are short-lived and heterogeneous, making their structures particularly elusive. The pipeline we describe, which incorporates experimental and theoretical knowledge combined with state-of-the-art interactive and immersive modelling tools, can help overcome these challenges. In both examples, we point to new insights into biological processes that arise from such interdisciplinary approaches.
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Affiliation(s)
- Anne-Elisabeth Molza
- CNRS, Université Paris-Cité, UPR 9080, Laboratoire de Biochimie Théorique, Paris, France
- Institut de Biologie Physico-Chimique-Fondation Edmond de Rothschild, PSL Research University, Paris, France
| | - Yvonne Westermaier
- Biophysics and Modelling Department/In Vitro Pharmacology Unit–IDRS (Servier Research Institute), Croissy-sur-Seine, France
| | | | - Pierre Ducrot
- Biophysics and Modelling Department/In Vitro Pharmacology Unit–IDRS (Servier Research Institute), Croissy-sur-Seine, France
| | | | | | - Mara Prentiss
- Department of Physics, Harvard University, Cambridge, MA, United States
| | - Charles H. Robert
- CNRS, Université Paris-Cité, UPR 9080, Laboratoire de Biochimie Théorique, Paris, France
- Institut de Biologie Physico-Chimique-Fondation Edmond de Rothschild, PSL Research University, Paris, France
| | - Marc Baaden
- CNRS, Université Paris-Cité, UPR 9080, Laboratoire de Biochimie Théorique, Paris, France
- Institut de Biologie Physico-Chimique-Fondation Edmond de Rothschild, PSL Research University, Paris, France
| | - Chantal Prévost
- CNRS, Université Paris-Cité, UPR 9080, Laboratoire de Biochimie Théorique, Paris, France
- Institut de Biologie Physico-Chimique-Fondation Edmond de Rothschild, PSL Research University, Paris, France
- *Correspondence: Chantal Prévost ,
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Mukherjee G, Pal A, Levy Y. Mechanism of the formation of the RecA-ssDNA nucleoprotein filament structure: a coarse-grained approach. MOLECULAR BIOSYSTEMS 2017; 13:2697-2703. [PMID: 29104981 DOI: 10.1039/c7mb00486a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In prokaryotes, the RecA protein catalyzes the repair and strand exchange of double-stranded DNA. RecA binds to single-stranded DNA (ssDNA) and forms a presynaptic complex in which the protein polymerizes around the ssDNA to form a right-handed helical nucleoprotein filament structure. In the present work, the mechanism for the formation of the RecA-ssDNA filament structure is modeled using coarse-grained molecular dynamics simulations. Information from the X-ray structure was used to model the protein itself but not its interactions; the interactions between the protein and the ssDNA were modeled solely by electrostatic, aromatic, and repulsive energies. For the present study, the monomeric, dimeric, and trimeric units of RecA and 4, 8, and 11 NT-long ssDNA, respectively, were studied. Our results indicate that monomeric RecA is not sufficient for nucleoprotein filament formation; rather, dimeric RecA is the elementary binding unit, with higher multimeric units of RecA facilitating filament formation. Our results reveal that loop region flexibility at the primary binding site of RecA is essential for it to bind the incoming ssDNA, that the aromatic residues present in the loop region play an important role in ssDNA binding, and that ATP may play a role in guiding the ssDNA by changing the electrostatic potential of the RecA protein.
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Affiliation(s)
- Goutam Mukherjee
- Department of Structural Biology, Weizmann Institute of Science, Rehovot, 76100, Israel.
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Akashi M, Harada S, Moki S, Okouji Y, Takahashi K, Kada S, Yamagami K, Sekine Y, Watanabe S, Chibazakura T, Yoshikawa H. Transposition of insertion sequence IS256Bsu1 in Bacillus subtilis 168 is strictly dependent on recA. Genes Genet Syst 2017; 92:59-71. [PMID: 28344191 DOI: 10.1266/ggs.16-00071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We developed an insertion sequence transposition detection system called the "jumping cat assay" and applied it to the Bacillus subtilis chromosome using IS256Bsu1 derived from B. subtilis natto. The high frequency of transposition enabled us to explore host factors; combining the assay and genetic analyses revealed that recA is essential for the transposition of IS256Bsu1. Detailed analyses using various domain mutants of recA demonstrated that this essentiality is not related to the function of recA in homologous recombination. Instead, the ATP binding and hydrolysis function seemed to be crucial for IS transposition. To elucidate the role of recA, we focused on the muB gene of the enterobacteriophage Mu. Based on information from the NCBI Conserved Domain Database, both MuB and RecA belong to the P-loop dNTPase superfamily. Further experiments revealed that muB complements the transposition-defective phenotype of a recA deletant, although it could not rescue UV sensitivity. These results suggest that recA shares a common function with muB that helps the transposition of IS256Bsu1 in B. subtilis.
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Affiliation(s)
| | - Shota Harada
- Department of Bioscience, Tokyo University of Agriculture
| | - Syunsuke Moki
- Department of Bioscience, Tokyo University of Agriculture
| | - Yuki Okouji
- Department of Bioscience, Tokyo University of Agriculture
| | | | - Shigeki Kada
- Central Research Institute, Mitsukan Group Co., Ltd
| | | | - Yasuhiko Sekine
- Department of Life Science, College of Science, Rikkyo (St Paul's) University
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Lu CH, Li HW. DNA with Different Local Torsional States Affects RecA-Mediated Recombination Progression. Chemphyschem 2017; 18:584-590. [PMID: 28054431 DOI: 10.1002/cphc.201601281] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 01/04/2017] [Indexed: 11/10/2022]
Abstract
DNA topology is thought to affect DNA enzyme activity. The helical structure of duplex DNA dictates the change of topological states during strand separation when DNA is constrained. During the repair of DNA double-stranded breaks, the RecA nucleoprotein filament invades DNA and carries out consecutive strand exchange reactions coupled with duplex DNA strand separation. It has been suggested that torsional strain could be generated and its accumulation could inhibit strand exchange. We used hairpin and nicked DNA substrates to test how torsional strain alters the RecA-mediated strand exchange efficiency. Single-molecule tethered particle motion (TPM) experiments showed that torsionally constrained hairpin DNA substrates returned nearly no successful strand exchange events catalyzed by RecA. Surprisingly, the strand exchange efficiencies increase in the presence of DNA nicks or loop disruption. The dwell time of transient RecA events in hairpin is shorter compared to those found in nicked or fork DNA substrates, which suggests a limited strand exchange progression in hairpin substrates. Our observation shows that RecA generates local torsional strain during strand exchange, and the inability to dissipate this torsional strain inhibits homologous recombination progression. DNA topological states are thus important regulation measures of DNA recombination.
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Affiliation(s)
- Chih-Hao Lu
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan) (R.O.C
| | - Hung-Wen Li
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan) (R.O.C
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Boyer B, Ezelin J, Poulain P, Saladin A, Zacharias M, Robert CH, Prévost C. An integrative approach to the study of filamentous oligomeric assemblies, with application to RecA. PLoS One 2015; 10:e0116414. [PMID: 25785454 PMCID: PMC4364692 DOI: 10.1371/journal.pone.0116414] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Accepted: 12/09/2014] [Indexed: 11/19/2022] Open
Abstract
Oligomeric macromolecules in the cell self-organize into a wide variety of geometrical motifs such as helices, rings or linear filaments. The recombinase proteins involved in homologous recombination present many such assembly motifs. Here, we examine in particular the polymorphic characteristics of RecA, the most studied member of the recombinase family, using an integrative approach that relates local modes of monomer/monomer association to the global architecture of their screw-type organization. In our approach, local modes of association are sampled via docking or Monte Carlo simulations. This enables shedding new light on fiber morphologies that may be adopted by the RecA protein. Two distinct RecA helical morphologies, the so-called "extended" and "compressed" forms, are known to play a role in homologous recombination. We investigate the variability within each form in terms of helical parameters and steric accessibility. We also address possible helical discontinuities in RecA filaments due to multiple monomer-monomer association modes. By relating local interface organization to global filament morphology, the strategies developed here to study RecA self-assembly are particularly well suited to other DNA-binding proteins and to filamentous protein assemblies in general.
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Affiliation(s)
- Benjamin Boyer
- Laboratoire de Biochimie Théorique, CNRS, UPR 9080, Univ Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
- MTI, INSERM UMR-M 973, Université Paris Diderot-Paris 7, Bât Lamarck, 35 rue Hélène Brion, 75205 Paris Cedex 13, France
| | - Johann Ezelin
- Laboratoire de Biochimie Théorique, CNRS, UPR 9080, Univ Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Pierre Poulain
- DSIMB team, Inserm UMR-S 665 and Univ. Paris Diderot, Sorbonne Paris Cité, INTS, 6 rue Alexandre Cabanel, 75015 Paris, France
- Ets Poulain, Pointe-Noire, Republic of Congo
| | - Adrien Saladin
- MTI, INSERM UMR-M 973, Université Paris Diderot-Paris 7, Bât Lamarck, 35 rue Hélène Brion, 75205 Paris Cedex 13, France
| | - Martin Zacharias
- Technische Universität München, Physik-Department, James-Franck-Str. 1, 85748 Garching, Germany
| | - Charles H. Robert
- Laboratoire de Biochimie Théorique, CNRS, UPR 9080, Univ Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
| | - Chantal Prévost
- Laboratoire de Biochimie Théorique, CNRS, UPR 9080, Univ Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France
- * E-mail:
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Abstract
All organisms need homologous recombination (HR) to repair DNA double-strand breaks. Defects in recombination are linked to genetic instability and to elevated risks in developing cancers. The central catalyst of HR is a nucleoprotein filament, consisting of recombinase proteins (human RAD51 or bacterial RecA) bound around single-stranded DNA. Over the last two decades, single-molecule techniques have provided substantial new insights into the dynamics of homologous recombination. Here, we survey important recent developments in this field of research and provide an outlook on future developments.
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Vlassakis J, Feinstein E, Yang D, Tilloy A, Weiller D, Kates-Harbeck J, Coljee V, Prentiss M. Tension on dsDNA bound to ssDNA-RecA filaments may play an important role in driving efficient and accurate homology recognition and strand exchange. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:032702. [PMID: 27499708 PMCID: PMC4973255 DOI: 10.1103/physreve.87.032702] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
It is well known that during homology recognition and strand exchange the double stranded DNA (dsDNA) in DNA/RecA filaments is highly extended, but the functional role of the extension has been unclear. We present an analytical model that calculates the distribution of tension in the extended dsDNA during strand exchange. The model suggests that the binding of additional dsDNA base pairs to the DNA/RecA filament alters the tension in dsDNA that was already bound to the filament, resulting in a non-linear increase in the mechanical energy as a function of the number of bound base pairs. This collective mechanical response may promote homology stringency and underlie unexplained experimental results.
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Affiliation(s)
- Julea Vlassakis
- Harvard University, Department of Physics, Cambridge, MA, 02138
| | | | - Darren Yang
- Harvard University, Department of Physics, Cambridge, MA, 02138
| | - Antoine Tilloy
- Harvard University, Department of Physics, Cambridge, MA, 02138
| | - Dominic Weiller
- Harvard University, Department of Physics, Cambridge, MA, 02138
| | | | - Vincent Coljee
- Harvard University, Department of Physics, Cambridge, MA, 02138
| | - Mara Prentiss
- Harvard University, Department of Physics, Cambridge, MA, 02138
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Naserian-Nik AM, Tahani M, Karttunen M. Pulling of double-stranded DNA by atomic force microscopy: a simulation in atomistic details. RSC Adv 2013. [DOI: 10.1039/c3ra23213a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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10
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Atwell S, Disseau L, Stasiak AZ, Stasiak A, Renodon-Cornière A, Takahashi M, Viovy JL, Cappello G. Probing Rad51-DNA interactions by changing DNA twist. Nucleic Acids Res 2012. [PMID: 23180779 PMCID: PMC3526263 DOI: 10.1093/nar/gks1131] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
In eukaryotes, Rad51 protein is responsible for the recombinational repair of double-strand DNA breaks. Rad51 monomers cooperatively assemble on exonuclease-processed broken ends forming helical nucleo-protein filaments that can pair with homologous regions of sister chromatids. Homologous pairing allows the broken ends to be reunited in a complex but error-free repair process. Rad51 protein has ATPase activity but its role is poorly understood, as homologous pairing is independent of adenosine triphosphate (ATP) hydrolysis. Here we use magnetic tweezers and electron microscopy to investigate how changes of DNA twist affect the structure of Rad51-DNA complexes and how ATP hydrolysis participates in this process. We show that Rad51 protein can bind to double-stranded DNA in two different modes depending on the enforced DNA twist. The stretching mode is observed when DNA is unwound towards a helical repeat of 18.6 bp/turn, whereas a non-stretching mode is observed when DNA molecules are not permitted to change their native helical repeat. We also show that the two forms of complexes are interconvertible and that by enforcing changes of DNA twist one can induce transitions between the two forms. Our observations permit a better understanding of the role of ATP hydrolysis in Rad51-mediated homologous pairing and strand exchange.
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Affiliation(s)
- Scott Atwell
- Institut Curie, Centre de Recherche-Physico-Chimie-Curie, CNRS UMR168, Université Pierre et Marie Curie, Paris F-75231, France, Centre Intégratif de Génomique, Faculté de Biologie et de Médecine, Université de Lausanne, CH-1015 Lausanne, Switzerland and Unité Fonctionnalité et Ingénierie des Protéines, FRE CNRS 3478, Université de Nantes, Nantes F-44322 Cedex 03, France
| | - Ludovic Disseau
- Institut Curie, Centre de Recherche-Physico-Chimie-Curie, CNRS UMR168, Université Pierre et Marie Curie, Paris F-75231, France, Centre Intégratif de Génomique, Faculté de Biologie et de Médecine, Université de Lausanne, CH-1015 Lausanne, Switzerland and Unité Fonctionnalité et Ingénierie des Protéines, FRE CNRS 3478, Université de Nantes, Nantes F-44322 Cedex 03, France
| | - Alicja Z. Stasiak
- Institut Curie, Centre de Recherche-Physico-Chimie-Curie, CNRS UMR168, Université Pierre et Marie Curie, Paris F-75231, France, Centre Intégratif de Génomique, Faculté de Biologie et de Médecine, Université de Lausanne, CH-1015 Lausanne, Switzerland and Unité Fonctionnalité et Ingénierie des Protéines, FRE CNRS 3478, Université de Nantes, Nantes F-44322 Cedex 03, France
| | - Andrzej Stasiak
- Institut Curie, Centre de Recherche-Physico-Chimie-Curie, CNRS UMR168, Université Pierre et Marie Curie, Paris F-75231, France, Centre Intégratif de Génomique, Faculté de Biologie et de Médecine, Université de Lausanne, CH-1015 Lausanne, Switzerland and Unité Fonctionnalité et Ingénierie des Protéines, FRE CNRS 3478, Université de Nantes, Nantes F-44322 Cedex 03, France
- *To whom correspondence should be addressed. Tel: +41 21 692 4282; Fax: +41 21 692 4115;
| | - Axelle Renodon-Cornière
- Institut Curie, Centre de Recherche-Physico-Chimie-Curie, CNRS UMR168, Université Pierre et Marie Curie, Paris F-75231, France, Centre Intégratif de Génomique, Faculté de Biologie et de Médecine, Université de Lausanne, CH-1015 Lausanne, Switzerland and Unité Fonctionnalité et Ingénierie des Protéines, FRE CNRS 3478, Université de Nantes, Nantes F-44322 Cedex 03, France
| | - Masayuki Takahashi
- Institut Curie, Centre de Recherche-Physico-Chimie-Curie, CNRS UMR168, Université Pierre et Marie Curie, Paris F-75231, France, Centre Intégratif de Génomique, Faculté de Biologie et de Médecine, Université de Lausanne, CH-1015 Lausanne, Switzerland and Unité Fonctionnalité et Ingénierie des Protéines, FRE CNRS 3478, Université de Nantes, Nantes F-44322 Cedex 03, France
| | - Jean-Louis Viovy
- Institut Curie, Centre de Recherche-Physico-Chimie-Curie, CNRS UMR168, Université Pierre et Marie Curie, Paris F-75231, France, Centre Intégratif de Génomique, Faculté de Biologie et de Médecine, Université de Lausanne, CH-1015 Lausanne, Switzerland and Unité Fonctionnalité et Ingénierie des Protéines, FRE CNRS 3478, Université de Nantes, Nantes F-44322 Cedex 03, France
| | - Giovanni Cappello
- Institut Curie, Centre de Recherche-Physico-Chimie-Curie, CNRS UMR168, Université Pierre et Marie Curie, Paris F-75231, France, Centre Intégratif de Génomique, Faculté de Biologie et de Médecine, Université de Lausanne, CH-1015 Lausanne, Switzerland and Unité Fonctionnalité et Ingénierie des Protéines, FRE CNRS 3478, Université de Nantes, Nantes F-44322 Cedex 03, France
- Correspondence may also be addressed to Giovanni Cappello. Tel: +33 1 56 24 64 68; Fax: +33 1 40 51 06 36;
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Abstract
The advent of new technologies allowing the study of single biological molecules continues to have a major impact on studies of interacting systems as well as enzyme reactions. These approaches (fluorescence, optical, and magnetic tweezers), in combination with ensemble methods, have been particularly useful for mechanistic studies of protein-nucleic acid interactions and enzymes that function on nucleic acids. We review progress in the use of single-molecule methods to observe and perturb the activities of proteins and enzymes that function on flexible single-stranded DNA. These include single-stranded DNA binding proteins, recombinases (RecA/Rad51), and helicases/translocases that operate as motor proteins and play central roles in genome maintenance. We emphasize methods that have been used to detect and study the movement of these proteins (both ATP-dependent directional and random movement) along the single-stranded DNA and the mechanistic and functional information that can result from detailed analysis of such movement.
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Affiliation(s)
- Taekjip Ha
- Department of Physics and the Center for the Physics of Living Cells, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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