1
|
Chinchilla OA, LiCata VJ. Plasmid expression of Deinococcus radiodurans RecA confers UV-A protection to Escherichia coli with an inverse protein dose dependence, which does not exceed conspecific RecA protection. Biochem Biophys Res Commun 2024; 710:149890. [PMID: 38608491 DOI: 10.1016/j.bbrc.2024.149890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Revised: 03/23/2024] [Accepted: 04/03/2024] [Indexed: 04/14/2024]
Abstract
Low level expression in Escherichia coli of the RecA protein from the radiation resistant bacterium Deinococcus radiodurans protects a RecA deficient strain of E. coli from UV-A irradiation by up to ∼160% over basal UV-A resistance. The protection effect is inverse protein dose dependent: increasing the expression level of the D. radiodurans RecA (DrRecA) protein decreases the protection factor. This inverse protein dose dependence effect helps resolve previously conflicting reports of whether DrRecA expression is protective or toxic for E. coli. In contrast to the D. radiodurans protein effect, conspecific plasmid expression of E. coli RecA protein in RecA deficient E. coli is consistently protective over several protein expression levels, as well as consistently more protective to higher levels of UV-A exposure than that provided by the D. radiodurans protein. The results indicate that plasmid expression of D. radiodurans RecA can modestly enhance the UV resistance of living E. coli, but that the heterospecific protein shifts from protective to toxic as expression is increased.
Collapse
Affiliation(s)
- Olga A Chinchilla
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Vince J LiCata
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, 70803, USA.
| |
Collapse
|
2
|
Li S, Zhu Q, Luo J, Shu Y, Guo K, Xie J, Xiao F, He S. Application Progress of Deinococcus radiodurans in Biological Treatment of Radioactive Uranium-Containing Wastewater. Indian J Microbiol 2021; 61:417-426. [PMID: 34744197 DOI: 10.1007/s12088-021-00969-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 08/03/2021] [Indexed: 02/04/2023] Open
Abstract
Radioactive uranium wastewater contains a large amount of radionuclide uranium and other heavy metal ions. The radioactive uranium wastewater discharged into the environment will not only pollute the natural environment, but also threat human health. Therefore, the treatment of radioactive uranium wastewater is a current research focus for many researchers. The treatment in radioactive uranium wastewater mainly includes physical, chemical and biological methods. At present, the using of biological treatment to treat uranium in radioactive uranium wastewater has been gradually shown its superiority and advantages. Deinococcus radiodurans is a famous microorganism with the most radiation resistant to ionizing radiation in the world, and can also resist various other extreme pressures. D. radiodurans can be directly used for the adsorption of uranium in radioactive waste water, and it can also transform other functional genes into D. radiodurans to construct genetically engineered bacteria, and then applied to the treatment of radioactive uranium containing wastewater. Radionuclides uranium in radioactive uranium-containing wastewater treated by D. radiodurans involves a lot of mechanisms. This article reviews currently the application of D. radiodurans that directly or construct genetically engineered bacteria in the treatment of radioactive uranium wastewater and discusses the mechanism of D. radiodurans in bioremediation of uranium. The application of constructing an engineered bacteria of D. radiodurans with powerful functions in uranium-containing wastewater is prospected.
Collapse
Affiliation(s)
- Shanshan Li
- School of Public Health, University of South China, Hengyang, 421001 Hunan China
| | - Qiqi Zhu
- School of Public Health, University of South China, Hengyang, 421001 Hunan China
| | - Jiaqi Luo
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001 Hunan China
| | - Yangzhen Shu
- School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001 Hunan China
| | - Kexin Guo
- School of Public Health, University of South China, Hengyang, 421001 Hunan China
| | - Jingxi Xie
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001 Hunan China
| | - Fangzhu Xiao
- School of Public Health, University of South China, Hengyang, 421001 Hunan China
| | - Shuya He
- School of Public Health, University of South China, Hengyang, 421001 Hunan China
| |
Collapse
|
3
|
Del Val E, Nasser W, Abaibou H, Reverchon S. Design and comparative characterization of RecA variants. Sci Rep 2021; 11:21106. [PMID: 34702889 PMCID: PMC8548320 DOI: 10.1038/s41598-021-00589-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 10/14/2021] [Indexed: 11/08/2022] Open
Abstract
RecA plays a central role in DNA repair and is a main actor involved in recombination and activation of the SOS response. It is also used in the context of biotechnological applications in recombinase polymerase isothermal amplification (RPA). In this work, we studied the biological properties of seven RecA variants, in particular their recombinogenic activity and their ability to induce the SOS response, to better understand the structure-function relationship of RecA and the effect of combined mutations. We also investigated the biochemical properties of RecA variants that may be useful for the development of biotechnological applications. We showed that Dickeya dadantii RecA (DdRecA) had an optimum strand exchange activity at 30 °C and in the presence of a dNTP mixture that inhibited Escherichia coli RecA (EcRecA). The differences between the CTD and C-tail of the EcRecA and DdRecA domains could explain the altered behaviour of DdRecA. D. radiodurans RecA (DrRecA) was unable to perform recombination and activation of the SOS response in an E. coli context, probably due to its inability to interact with E. coli recombination accessory proteins and SOS LexA repressor. DrRecA strand exchange activity was totally inhibited in the presence of chloride ions but worked well in acetate buffer. The overproduction of Pseudomonas aeruginosa RecA (PaRecA) in an E. coli context was responsible for a higher SOS response and defects in cellular growth. PaRecA was less inhibited by the dNTP mixture than EcRecA. Finally, the study of three variants, namely, EcPa, EcRecAV1 and EcRecAV2, that contained a combination of mutations that, taken independently, are described as improving recombination, led us to raise new hypotheses on the structure-function relationship and on the monomer-monomer interactions that perturb the activity of the protein as a whole.
Collapse
Affiliation(s)
- Elsa Del Val
- UMR5240, Microbiologie, Adaptation et Pathogénie, University of Lyon, Université Claude Bernard Lyon 1, INSA-Lyon, CNRS, 11 Avenue Jean Capelle, 69621, Villeurbanne, France
- Molecular Innovation Unit, Centre Christophe Mérieux, bioMérieux, 5 Rue des Berges, 38024, Grenoble Cedex 01, France
| | - William Nasser
- UMR5240, Microbiologie, Adaptation et Pathogénie, University of Lyon, Université Claude Bernard Lyon 1, INSA-Lyon, CNRS, 11 Avenue Jean Capelle, 69621, Villeurbanne, France
| | - Hafid Abaibou
- Molecular Innovation Unit, Centre Christophe Mérieux, bioMérieux, 5 Rue des Berges, 38024, Grenoble Cedex 01, France.
| | - Sylvie Reverchon
- UMR5240, Microbiologie, Adaptation et Pathogénie, University of Lyon, Université Claude Bernard Lyon 1, INSA-Lyon, CNRS, 11 Avenue Jean Capelle, 69621, Villeurbanne, France.
| |
Collapse
|
4
|
Rajpurohit YS, Sharma DK, Misra HS. PprA Protein Inhibits DNA Strand Exchange and ATP Hydrolysis of Deinococcus RecA and Regulates the Recombination in Gamma-Irradiated Cells. Front Cell Dev Biol 2021; 9:636178. [PMID: 33959605 PMCID: PMC8093518 DOI: 10.3389/fcell.2021.636178] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 03/23/2021] [Indexed: 11/14/2022] Open
Abstract
DrRecA and PprA proteins function are crucial for the extraordinary resistance to γ-radiation and DNA strand break repair in Deinococcus radiodurans. DrRecA mediated homologous recombination help in DNA strand break repair and cell survival, while the PprA protein confers radio-resistance via its roles in DNA repair, genome maintenance, and cell division. Genetically recA and pprA genes interact and constitute an epistatic group however, the mechanism underlying their functional interaction is not clear. Here, we showed the physical and functional interaction of DrRecA and PprA protein both in solution and inside the cells. The absence of the pprA gene increases the recombination frequency in gamma-irradiated D. radiodurans cells and genomic instability in cells growing under normal conditions. PprA negatively regulates the DrRecA functions by inhibiting DrRecA mediated DNA strand exchange and ATPase function in vitro. Furthermore, it is shown that the inhibitory effect of PprA on DrRecA catalyzed DNA strand exchange was not due to sequestration of homologous dsDNA and was dependent on PprA oligomerization and DNA binding property. Together, results suggest that PprA is a new member of recombination mediator proteins (RMPs), and able to regulate the DrRecA function in γ-irradiated cells by protecting the D. radiodurans genome from hyper-recombination and associated negative effects.
Collapse
Affiliation(s)
- Yogendra Singh Rajpurohit
- Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai, India.,Homi Bhabha National Institute (DAE- Deemed University), Mumbai, India
| | - Dhirendra Kumar Sharma
- Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai, India.,Homi Bhabha National Institute (DAE- Deemed University), Mumbai, India
| | - Hari S Misra
- Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai, India.,Homi Bhabha National Institute (DAE- Deemed University), Mumbai, India
| |
Collapse
|
5
|
Achazi K, Haag R, Ballauff M, Dernedde J, Kizhakkedathu JN, Maysinger D, Multhaup G. Understanding the Interaction of Polyelectrolyte Architectures with Proteins and Biosystems. Angew Chem Int Ed Engl 2021; 60:3882-3904. [PMID: 32589355 PMCID: PMC7894192 DOI: 10.1002/anie.202006457] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Indexed: 02/06/2023]
Abstract
The counterions neutralizing the charges on polyelectrolytes such as DNA or heparin may dissociate in water and greatly influence the interaction of such polyelectrolytes with biomolecules, particularly proteins. In this Review we give an overview of studies on the interaction of proteins with polyelectrolytes and how this knowledge can be used for medical applications. Counterion release was identified as the main driving force for the binding of proteins to polyelectrolytes: Patches of positive charge become multivalent counterions of the polyelectrolyte and lead to the release of counterions from the polyelectrolyte and a concomitant increase in entropy. This is shown from investigations on the interaction of proteins with natural and synthetic polyelectrolytes. Special emphasis is paid to sulfated dendritic polyglycerols (dPGS). The Review demonstrates that we are moving to a better understanding of charge-charge interactions in systems of biological relevance. Research along these lines will aid and promote the design of synthetic polyelectrolytes for medical applications.
Collapse
Affiliation(s)
- Katharina Achazi
- Institut für Chemie und BiochemieFreie Universität BerlinTakustrasse 314195BerlinGermany
| | - Rainer Haag
- Institut für Chemie und BiochemieFreie Universität BerlinTakustrasse 314195BerlinGermany
| | - Matthias Ballauff
- Institut für Chemie und BiochemieFreie Universität BerlinTakustrasse 314195BerlinGermany
- IRIS AdlershofHumboldt Universität zu BerlinZum Grossen Windkanal 612489BerlinGermany
| | - Jens Dernedde
- Charité-Universitätsmedizin BerlinInstitute of Laboratory MedicineClinical Chemistry, and PathobiochemistryCVK Augustenburger Platz 113353BerlinGermany
| | - Jayachandran N. Kizhakkedathu
- Centre for Blood ResearchDepartment of Pathology and Laboratory MedicineLife Science InstituteDepartment of ChemistrySchool of Biomedical EngineeringUniversity of British ColumbiaVancouverV6T 1Z3Canada
| | - Dusica Maysinger
- Department of Pharmacology and TherapeuticsMcGill UniversityMontrealH3G 1Y6Canada
| | - Gerd Multhaup
- Department of Pharmacology and TherapeuticsMcGill UniversityMontrealH3G 1Y6Canada
| |
Collapse
|
6
|
Achazi K, Haag R, Ballauff M, Dernedde J, Kizhakkedathu JN, Maysinger D, Multhaup G. Wechselwirkung von Polyelektrolyt‐Architekturen mit Proteinen und Biosystemen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202006457] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Katharina Achazi
- Institut für Chemie und Biochemie Freie Universität Berlin Takustraße 3 14195 Berlin Deutschland
| | - Rainer Haag
- Institut für Chemie und Biochemie Freie Universität Berlin Takustraße 3 14195 Berlin Deutschland
| | - Matthias Ballauff
- Institut für Chemie und Biochemie Freie Universität Berlin Takustraße 3 14195 Berlin Deutschland
- IRIS Adlershof Humboldt-Universität zu Berlin Zum Großen Windkanal 6 12489 Berlin Deutschland
| | - Jens Dernedde
- Charité-Universitätsmedizin Berlin Institut für Laboratoriumsmedizin Klinische Chemie und Pathobiochemie CVK Augustenburger Platz 1 13353 Berlin Deutschland
| | - Jayachandran N. Kizhakkedathu
- Centre for Blood Research Department of Pathology and Laboratory Medicine Life Science Institute Department of Chemistry School of Biomedical Engineering University of British Columbia Vancouver V6T 1Z3 Kanada
| | - Dusica Maysinger
- Department of Pharmacology and Therapeutics McGill University Montreal H3G 1Y6 Kanada
| | - Gerd Multhaup
- Department of Pharmacology and Therapeutics McGill University Montreal H3G 1Y6 Kanada
| |
Collapse
|
7
|
Single-Molecule Insights into ATP-Dependent Conformational Dynamics of Nucleoprotein Filaments of Deinococcus radiodurans RecA. Int J Mol Sci 2020; 21:ijms21197389. [PMID: 33036395 PMCID: PMC7583915 DOI: 10.3390/ijms21197389] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 10/01/2020] [Accepted: 10/04/2020] [Indexed: 11/17/2022] Open
Abstract
Deinococcus radiodurans (Dr) has one of the most robust DNA repair systems, which is capable of withstanding extreme doses of ionizing radiation and other sources of DNA damage. DrRecA, a central enzyme of recombinational DNA repair, is essential for extreme radioresistance. In the presence of ATP, DrRecA forms nucleoprotein filaments on DNA, similar to other bacterial RecA and eukaryotic DNA strand exchange proteins. However, DrRecA catalyzes DNA strand exchange in a unique reverse pathway. Here, we study the dynamics of DrRecA filaments formed on individual molecules of duplex and single-stranded DNA, and we follow conformational transitions triggered by ATP hydrolysis. Our results reveal that ATP hydrolysis promotes rapid DrRecA dissociation from duplex DNA, whereas on single-stranded DNA, DrRecA filaments interconvert between stretched and compressed conformations, which is a behavior shared by E. coli RecA and human Rad51. This indicates a high conservation of conformational switching in nucleoprotein filaments and suggests that additional factors might contribute to an inverse pathway of DrRecA strand exchange.
Collapse
|
8
|
Fan HF, Su S, Kuo YA, Chen CJ. Influence of the C-Terminal Tail of RecA Proteins from Alkaline pH-Resistant Bacterium Deinococcus Ficus. ACS OMEGA 2020; 5:19868-19876. [PMID: 32803083 PMCID: PMC7424711 DOI: 10.1021/acsomega.0c02865] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 07/14/2020] [Indexed: 06/11/2023]
Abstract
Deinococcus ficus CC-FR2-10T, resistant to ultraviolet, ionizing radiation, and chemicals which may cause DNA damage, was identified in Taiwan. The expression level of D. ficus RecA, which has 92% sequence identity with Deinococcus radiodurans (Dr.) RecA, will be upregulated upon UV radiation. Multiple sequence alignment of RecA proteins from bacteria belonging to Escherichia coli and the Deinococcus genus reveals that the C-terminal tail of D. ficus RecA is shorter and contains less acidic residues than E. coli RecA. D. ficus RecA exhibits a higher ATPase activity toward single-stranded (ss) DNA and efficiently promotes DNA strand exchange that a filament is first formed on ssDNA, followed by uptake of the double-stranded (ds) substrate. Moreover, D. ficus RecA exhibits a pH-reaction profile for DNA strand exchange similar to E. coli ΔC17 RecA. Later, a chimera D. ficus C17 E. coli RecA with more acidic residues in the C-terminal tail was constructed and purified. Increased negativity in the C-terminal tail makes the pH reaction profile for Chimera D. ficus C17 E. coli RecA DNA strand exchange exhibit a reaction optimum similar to E. coli RecA. To sum up, D. ficus RecA exhibits reaction properties in substrate-dependent ATPase activity and DNA strand exchange similar to E. coli RecA. Our data indicate that the negativity in the C-terminal tail plays an important role in the regulation of pH-dependent DNA strand exchange activity.
Collapse
Affiliation(s)
- Hsiu-Fang Fan
- Institute
of Medical Science and Technology, National
Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Department
of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Aerosol
Science Research Center, National Sun Yat-sen
University, Kaohsiung 80424, Taiwan
| | - Shu Su
- Department
of Life Sciences and Institute of Genome Sciences, National Yang-Ming University, Taipei 11221, Taiwan
| | - Ying-An Kuo
- Department
of Life Sciences and Institute of Genome Sciences, National Yang-Ming University, Taipei 11221, Taiwan
| | - Cyuan-Ji Chen
- Department
of Life Sciences and Institute of Genome Sciences, National Yang-Ming University, Taipei 11221, Taiwan
| |
Collapse
|
9
|
RecA and DNA recombination: a review of molecular mechanisms. Biochem Soc Trans 2020; 47:1511-1531. [PMID: 31654073 DOI: 10.1042/bst20190558] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 09/18/2019] [Accepted: 09/25/2019] [Indexed: 11/17/2022]
Abstract
Recombinases are responsible for homologous recombination and maintenance of genome integrity. In Escherichia coli, the recombinase RecA forms a nucleoprotein filament with the ssDNA present at a DNA break and searches for a homologous dsDNA to use as a template for break repair. During the first step of this process, the ssDNA is bound to RecA and stretched into a Watson-Crick base-paired triplet conformation. The RecA nucleoprotein filament also contains ATP and Mg2+, two cofactors required for RecA activity. Then, the complex starts a homology search by interacting with and stretching dsDNA. Thanks to supercoiling, intersegment sampling and RecA clustering, a genome-wide homology search takes place at a relevant metabolic timescale. When a region of homology 8-20 base pairs in length is found and stabilized, DNA strand exchange proceeds, forming a heteroduplex complex that is resolved through a combination of DNA synthesis, ligation and resolution. RecA activities can take place without ATP hydrolysis, but this latter activity is necessary to improve and accelerate the process. Protein flexibility and monomer-monomer interactions are fundamental for RecA activity, which functions cooperatively. A structure/function relationship analysis suggests that the recombinogenic activity can be improved and that recombinases have an inherently large recombination potential. Understanding this relationship is essential for designing RecA derivatives with enhanced activity for biotechnology applications. For example, this protein is a major actor in the recombinase polymerase isothermal amplification (RPA) used in point-of-care diagnostics.
Collapse
|
10
|
Wang W, Ma Y, He J, Qi H, Xiao F, He S. Gene regulation for the extreme resistance to ionizing radiation of Deinococcus radiodurans. Gene 2019; 715:144008. [DOI: 10.1016/j.gene.2019.144008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 07/24/2019] [Accepted: 07/24/2019] [Indexed: 01/05/2023]
|
11
|
Lim S, Jung JH, Blanchard L, de Groot A. Conservation and diversity of radiation and oxidative stress resistance mechanisms in Deinococcus species. FEMS Microbiol Rev 2019; 43:19-52. [PMID: 30339218 PMCID: PMC6300522 DOI: 10.1093/femsre/fuy037] [Citation(s) in RCA: 120] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Accepted: 10/17/2018] [Indexed: 12/17/2022] Open
Abstract
Deinococcus bacteria are famous for their extreme resistance to ionising radiation and other DNA damage- and oxidative stress-generating agents. More than a hundred genes have been reported to contribute to resistance to radiation, desiccation and/or oxidative stress in Deinococcus radiodurans. These encode proteins involved in DNA repair, oxidative stress defence, regulation and proteins of yet unknown function or with an extracytoplasmic location. Here, we analysed the conservation of radiation resistance-associated proteins in other radiation-resistant Deinococcus species. Strikingly, homologues of dozens of these proteins are absent in one or more Deinococcus species. For example, only a few Deinococcus-specific proteins and radiation resistance-associated regulatory proteins are present in each Deinococcus, notably the metallopeptidase/repressor pair IrrE/DdrO that controls the radiation/desiccation response regulon. Inversely, some Deinococcus species possess proteins that D. radiodurans lacks, including DNA repair proteins consisting of novel domain combinations, translesion polymerases, additional metalloregulators, redox-sensitive regulator SoxR and manganese-containing catalase. Moreover, the comparisons improved the characterisation of several proteins regarding important conserved residues, cellular location and possible protein–protein interactions. This comprehensive analysis indicates not only conservation but also large diversity in the molecular mechanisms involved in radiation resistance even within the Deinococcus genus.
Collapse
Affiliation(s)
- Sangyong Lim
- Biotechnology Research Division, Korea Atomic Energy Research Institute, Jeongeup 56212, Republic of Korea
| | - Jong-Hyun Jung
- Biotechnology Research Division, Korea Atomic Energy Research Institute, Jeongeup 56212, Republic of Korea
| | | | - Arjan de Groot
- Aix Marseille Univ, CEA, CNRS, BIAM, Saint Paul-Lez-Durance, France
| |
Collapse
|
12
|
Uranga LA, Reyes ED, Patidar PL, Redman LN, Lusetti SL. The cohesin-like RecN protein stimulates RecA-mediated recombinational repair of DNA double-strand breaks. Nat Commun 2017; 8:15282. [PMID: 28513583 PMCID: PMC5442325 DOI: 10.1038/ncomms15282] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Accepted: 03/15/2017] [Indexed: 12/12/2022] Open
Abstract
RecN is a cohesin-like protein involved in DNA double-strand break repair in bacteria. The RecA recombinase functions to mediate repair via homologous DNA strand invasion to form D-loops. Here we provide evidence that the RecN protein stimulates the DNA strand invasion step of RecA-mediated recombinational DNA repair. The intermolecular DNA tethering activity of RecN protein described previously cannot fully explain this novel activity since stimulation of RecA function is species-specific and requires RecN ATP hydrolysis. Further, DNA-bound RecA protein increases the rate of ATP hydrolysis catalysed by RecN during the DNA pairing reaction. DNA-dependent RecN ATPase kinetics are affected by RecA protein in a manner suggesting a specific order of protein-DNA assembly, with RecN acting after RecA binds DNA. We present a model for RecN function that includes presynaptic stimulation of the bacterial repair pathway perhaps by contributing to the RecA homology search before ternary complex formation.
Collapse
Affiliation(s)
- Lee A. Uranga
- Department of Chemistry and Biochemistry, New Mexico State University, P.O. Box 30001, MSC 3C, Las Cruces, New Mexico 88003, USA
| | - Emigdio D. Reyes
- Department of Chemistry and Biochemistry, New Mexico State University, P.O. Box 30001, MSC 3C, Las Cruces, New Mexico 88003, USA
| | - Praveen L. Patidar
- Department of Chemistry and Biochemistry, New Mexico State University, P.O. Box 30001, MSC 3C, Las Cruces, New Mexico 88003, USA
| | - Lindsay N. Redman
- Department of Chemistry and Biochemistry, New Mexico State University, P.O. Box 30001, MSC 3C, Las Cruces, New Mexico 88003, USA
| | - Shelley L. Lusetti
- Department of Chemistry and Biochemistry, New Mexico State University, P.O. Box 30001, MSC 3C, Las Cruces, New Mexico 88003, USA
| |
Collapse
|