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Hogenkamp F, Hilgers F, Bitzenhofer NL, Ophoven V, Haase M, Bier C, Binder D, Jaeger KE, Drepper T, Pietruszka J. Optochemical Control of Bacterial Gene Expression: Novel Photocaged Compounds for Different Promoter Systems. Chembiochem 2021; 23:e202100467. [PMID: 34750949 PMCID: PMC9299732 DOI: 10.1002/cbic.202100467] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 11/02/2021] [Indexed: 12/05/2022]
Abstract
Photocaged compounds are applied for implementing precise, optochemical control of gene expression in bacteria. To broaden the scope of UV‐light‐responsive inducer molecules, six photocaged carbohydrates were synthesized and photochemically characterized, with the absorption exhibiting a red‐shift. Their differing linkage through ether, carbonate, and carbamate bonds revealed that carbonate and carbamate bonds are convenient. Subsequently, those compounds were successfully applied in vivo for controlling gene expression in E. coli via blue light illumination. Furthermore, benzoate‐based expression systems were subjected to light control by establishing a novel photocaged salicylic acid derivative. Besides its synthesis and in vitro characterization, we demonstrate the challenging choice of a suitable promoter system for light‐controlled gene expression in E. coli. We illustrate various bottlenecks during both photocaged inducer synthesis and in vivo application and possibilities to overcome them. These findings pave the way towards novel caged inducer‐dependent systems for wavelength‐selective gene expression.
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Affiliation(s)
- Fabian Hogenkamp
- Institute of Bioorganic Chemistry, Heinrich Heine University Düsseldorf at Forschungszentrum Jülich Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC)
| | - Fabienne Hilgers
- Institute of Molecular Enzyme Technology Heinrich Heine University Düsseldorf at Forschungszentrum Jülich, Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC)
| | - Nora Lisa Bitzenhofer
- Institute of Molecular Enzyme Technology Heinrich Heine University Düsseldorf at Forschungszentrum Jülich, Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC)
| | - Vera Ophoven
- Institute of Bioorganic Chemistry, Heinrich Heine University Düsseldorf at Forschungszentrum Jülich Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC)
| | - Mona Haase
- Institute of Bioorganic Chemistry, Heinrich Heine University Düsseldorf at Forschungszentrum Jülich Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC)
| | - Claus Bier
- Institute of Bioorganic Chemistry, Heinrich Heine University Düsseldorf at Forschungszentrum Jülich Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC)
| | - Dennis Binder
- Institute of Molecular Enzyme Technology Heinrich Heine University Düsseldorf at Forschungszentrum Jülich, Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC)
| | - Karl-Erich Jaeger
- Institute of Molecular Enzyme Technology Heinrich Heine University Düsseldorf at Forschungszentrum Jülich, Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC).,Institute of Bio- and Geosciences (IBG-1: Biotechnology), Forschungszentrum Jülich GmbH, 52426, Jülich, Germany
| | - Thomas Drepper
- Institute of Molecular Enzyme Technology Heinrich Heine University Düsseldorf at Forschungszentrum Jülich, Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC)
| | - Jörg Pietruszka
- Institute of Bioorganic Chemistry, Heinrich Heine University Düsseldorf at Forschungszentrum Jülich Stetternicher Forst, 52426, Jülich, Germany.,Bioeconomy Science Center (BioSC).,Institute of Bio- and Geosciences (IBG-1: Biotechnology), Forschungszentrum Jülich GmbH, 52426, Jülich, Germany
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Pérez-Pantoja D, Nikel PI, Chavarría M, de Lorenzo V. Transcriptional control of 2,4-dinitrotoluene degradation in Burkholderia sp. R34 bears a regulatory patch that eases pathway evolution. Environ Microbiol 2021; 23:2522-2531. [PMID: 33734558 DOI: 10.1111/1462-2920.15472] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 02/27/2021] [Accepted: 03/16/2021] [Indexed: 11/26/2022]
Abstract
The dnt pathway of Burkholderia sp. R34 is in the midst of an evolutionary journey from its ancestral, natural substrate (naphthalene) towards a new xenobiotic one [2,4-dinitrotoluene (DNT)]. The gene cluster encoding the leading multicomponent ring dioxygenase (DntA) has activity on the old and the new substrate, but it is induced by neither. Instead, the transcriptional factor encoded by the adjacent gene (dntR) activates expression of the dnt cluster upon addition of salicylate, one degradation intermediate of the ancestral naphthalene route but not any longer a substrate/product of the evolved DntA enzyme. Fluorescence of cells bearing dntA-gfp fusions revealed that induction of the dnt genes by salicylate was enhanced upon exposure to bona fide DntA substrates, i.e., naphthalene or DNT. Such amplification was dependent on effective dioxygenation of these pathway-specific head compounds, which thereby fostered expression of the cognate catabolic operon. The phenomenon seems to happen not through direct binding to a cognate transcriptional factor but through the interplay of a non-specific regulator with a substrate-specific enzyme. This regulatory scenario may ease transition of complete catabolic operons (i.e. enzymes plus regulatory devices) from one substrate to another without loss of fitness during the evolutionary roadmap between two optimal specificities.
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Affiliation(s)
- Danilo Pérez-Pantoja
- Programa Institucional de Fomento a la Investigación, Desarrollo e Innovación (PIDi), Universidad Tecnológica Metropolitana, Santiago, 8940577, Chile
| | - Pablo I Nikel
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Kgs Lyngby, 2800, Denmark
| | - Max Chavarría
- Escuela de Química and CIPRONA, Universidad de Costa Rica, San José, 2060, Costa Rica
| | - Víctor de Lorenzo
- Systems and Synthetic Biology Department, Centro Nacional de Biotecnología (CNB-CSIC), Madrid, 28049, Spain
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3
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Wolański M, Krawiec M, Schwarz PN, Stegmann E, Wohlleben W, Buchmann A, Gross H, Eitel M, Koch P, Botas A, Méndez C, Núñez LE, Morís F, Cortés J, Zakrzewska‐Czerwińska J. A novel LysR-type regulator negatively affects biosynthesis of the immunosuppressant brasilicardin. Eng Life Sci 2021; 21:4-18. [PMID: 33531886 PMCID: PMC7837296 DOI: 10.1002/elsc.202000038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 09/29/2020] [Accepted: 10/08/2020] [Indexed: 11/16/2022] Open
Abstract
Brasilicardin A (BraA) is a promising immunosuppressive compound produced naturally by the pathogenic bacterium Nocardia terpenica IFM 0406. Heterologous host expression of brasilicardin gene cluster showed to be efficient to bypass the safety issues, low production levels and lack of genetic tools related with the use of native producer. Further improvement of production yields requires better understanding of gene expression regulation within the BraA biosynthetic gene cluster (Bra-BGC); however, the only so far known regulator of this gene cluster is Bra12. In this study, we discovered the protein LysRNt, a novel member of the LysR-type transcriptional regulator family, as a regulator of the Bra-BGC. Using in vitro approaches, we identified the gene promoters which are controlled by LysRNt within the Bra-BGC. Corresponding genes encode enzymes involved in BraA biosynthesis as well as the key Bra-BGC regulator Bra12. Importantly, we provide in vivo evidence that LysRNt negatively affects production of brasilicardin congeners in the heterologous host Amycolatopsis japonicum. Finally, we demonstrate that some of the pathway related metabolites, and their chemical analogs, can interact with LysRNt which in turn affects its DNA-binding activity.
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Affiliation(s)
| | - Michał Krawiec
- Faculty of BiotechnologyUniversity of WrocławWrocławPoland
| | - Paul N. Schwarz
- Department of Microbiology and BiotechnologyInterfaculty Institute of Microbiology and Infection MedicineUniversity of TübingenTübingenGermany
| | - Evi Stegmann
- Department of Microbiology and BiotechnologyInterfaculty Institute of Microbiology and Infection MedicineUniversity of TübingenTübingenGermany
- German Centre for Infection Research (DZIF)Partner Site TübingenTübingenGermany
| | - Wolfgang Wohlleben
- Department of Microbiology and BiotechnologyInterfaculty Institute of Microbiology and Infection MedicineUniversity of TübingenTübingenGermany
- German Centre for Infection Research (DZIF)Partner Site TübingenTübingenGermany
| | - Anina Buchmann
- German Centre for Infection Research (DZIF)Partner Site TübingenTübingenGermany
- Department of Pharmaceutical BiologyInstitute of Pharmaceutical SciencesUniversity of TübingenTübingenGermany
- Present address:
Institute of Biochemical EngineeringUniversity of StuttgartStuttgartGermany
| | - Harald Gross
- German Centre for Infection Research (DZIF)Partner Site TübingenTübingenGermany
- Department of Pharmaceutical BiologyInstitute of Pharmaceutical SciencesUniversity of TübingenTübingenGermany
| | - Michael Eitel
- Department of Pharmaceutical ChemistryInstitute of Pharmaceutical SciencesUniversity of TübingenTübingenGermany
| | - Pierre Koch
- Department of Pharmaceutical ChemistryInstitute of Pharmaceutical SciencesUniversity of TübingenTübingenGermany
| | - Alma Botas
- Departamento de Biología Funcional e Instituto Universitario de Oncología del Principado de AsturiasUniversidad de OviedoOviedoSpain
| | - Carmen Méndez
- Departamento de Biología Funcional e Instituto Universitario de Oncología del Principado de AsturiasUniversidad de OviedoOviedoSpain
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Liu Q, Hassan KA, Ashwood HE, Gamage HKAH, Li L, Mabbutt BC, Paulsen IT. Regulation of the aceI multidrug efflux pump gene in Acinetobacter baumannii. J Antimicrob Chemother 2019; 73:1492-1500. [PMID: 29481596 PMCID: PMC5961012 DOI: 10.1093/jac/dky034] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 01/15/2018] [Indexed: 01/17/2023] Open
Abstract
Objectives To investigate the function of AceR, a putative transcriptional regulator of the chlorhexidine efflux pump gene aceI in Acinetobacter baumannii. Methods Chlorhexidine susceptibility and chlorhexidine induction of aceI gene expression were determined by MIC and quantitative real-time PCR, respectively, in A. baumannii WT and ΔaceR mutant strains. Recombinant AceR was prepared as both a full-length protein and as a truncated protein, AceR (86–299), i.e. AceRt, which has the DNA-binding domain deleted. The binding interaction of the purified AceR protein and its putative operator region was investigated by electrophoretic mobility shift assays and DNase I footprinting assays. The binding of AceRt with its putative ligand chlorhexidine was examined using surface plasmon resonance and tryptophan fluorescence quenching assays. Results MIC determination assays indicated that the ΔaceI and ΔaceR mutant strains both showed lower resistance to chlorhexidine than the parental strain. Chlorhexidine-induced expression of aceI was abolished in a ΔaceR background. Electrophoretic mobility shift assays and DNase I footprinting assays demonstrated chlorhexidine-stimulated binding of AceR with two sites upstream of the putative aceI promoter. Surface plasmon resonance and tryptophan fluorescence quenching assays suggested that the purified ligand-binding domain of the AceR protein was able to bind with chlorhexidine with high affinity. Conclusions This study provides strong evidence that AceR is an activator of aceI gene expression when challenged with chlorhexidine. This study is the first characterization, to our knowledge, of a regulator controlling expression of a PACE family multidrug efflux pump.
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Affiliation(s)
- Qi Liu
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Karl A Hassan
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Heather E Ashwood
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Hasinika K A H Gamage
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Liping Li
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Bridget C Mabbutt
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Ian T Paulsen
- Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW, Australia
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5
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Koentjoro MP, Adachi N, Senda M, Ogawa N, Senda T. Crystal structure of theDNA‐binding domain of the LysR‐type transcriptional regulator CbnR in complex with aDNAfragment of the recognition‐binding site in the promoter region. FEBS J 2018; 285:977-989. [DOI: 10.1111/febs.14380] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 11/17/2017] [Accepted: 01/08/2018] [Indexed: 11/29/2022]
Affiliation(s)
| | - Naruhiko Adachi
- Structural Biology Research Center Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Japan
- Department of Materials Structure Science Accelerator Science The Graduate University of Advanced Studies (Soken‐dai) Tsukuba Japan
- Precursory Research for Embryonic Science and Technology Japan Science and Technology Agency Tsukuba Japan
| | - Miki Senda
- Structural Biology Research Center Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Japan
| | - Naoto Ogawa
- The United Graduate School of Agricultural Science Gifu University Japan
- Department of Applied Life Sciences Faculty of Agriculture Shizuoka University Japan
| | - Toshiya Senda
- Structural Biology Research Center Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Japan
- Department of Materials Structure Science Accelerator Science The Graduate University of Advanced Studies (Soken‐dai) Tsukuba Japan
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Koentjoro MP, Ogawa N. STRUCTURAL STUDIES OF TRANSCRIPTIONAL REGULATION BY LysR-TYPE TRANSCRIPTIONAL REGULATORS IN BACTERIA. ACTA ACUST UNITED AC 2018. [DOI: 10.7831/ras.6.105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Naoto Ogawa
- The United Graduate School of Agricultural Science, Gifu University
- Faculty of Agriculture, Shizuoka University
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7
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Lerche M, Dian C, Round A, Lönneborg R, Brzezinski P, Leonard GA. The solution configurations of inactive and activated DntR have implications for the sliding dimer mechanism of LysR transcription factors. Sci Rep 2016; 6:19988. [PMID: 26817994 PMCID: PMC4730206 DOI: 10.1038/srep19988] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 12/21/2015] [Indexed: 11/09/2022] Open
Abstract
LysR Type Transcriptional Regulators (LTTRs) regulate basic metabolic pathways or virulence gene expression in prokaryotes. Evidence suggests that the activation of LTTRs involves a conformational change from an inactive compact apo- configuration that represses transcription to an active, expanded holo- form that promotes it. However, no LTTR has yet been observed to adopt both configurations. Here, we report the results of structural studies of various forms of the LTTR DntR. Crystal structures of apo-DntR and of a partially autoinducing mutant H169T-DntR suggest that active and inactive DntR maintain a compact homotetrameric configuration. However, Small Angle X-ray Scattering (SAXS) studies on solutions of apo-, H169T- and inducer-bound holo-DntR indicate a different behaviour, suggesting that while apo-DntR maintains a compact configuration in solution both H169T- and holo-DntR adopt an expanded conformation. Models of the SAXS-obtained solution conformations of apo- and holo-DntR homotetramers in complex with promoter-operator region DNA are consistent with previous observations of a shifting of LTTR DNA binding sites upon activation and a consequent relaxation in the bend of the promoter-operator region DNA. Our results thus provide clear evidence at the molecular level which strongly supports the 'sliding dimer' hypothesis concerning LTTR activation mechanisms.
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Affiliation(s)
- Michael Lerche
- Structural Bioloy Group, European Synchrotron Radiation Facility
(ESRF), CS 40220, 38043
Grenoble Cedex 9, France
| | - Cyril Dian
- Institut de Biologie Structurale Jean-Pierre Ebel,
71 avenue des Martyrs, CS 10090, 38044
Grenoble Cedex 9, France
| | - Adam Round
- European Molecular Biology Laboratory, Grenoble
Outstation, 38042
Grenoble Cedex 9, France
- Unit for Virus Host-Cell Interactions, University Grenoble
Alpes-EMBL-CNRS, 38042
Grenoble Cedex 9, France
| | - Rosa Lönneborg
- Department of Biochemistry and Biophysics, Arrhenius
Laboratories for Natural Sciences, Stockholm University, SE-106
91
Stockholm, Sweden
| | - Peter Brzezinski
- Department of Biochemistry and Biophysics, Arrhenius
Laboratories for Natural Sciences, Stockholm University, SE-106
91
Stockholm, Sweden
| | - Gordon A. Leonard
- Structural Bioloy Group, European Synchrotron Radiation Facility
(ESRF), CS 40220, 38043
Grenoble Cedex 9, France
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Use of Substrate-Induced Gene Expression in Metagenomic Analysis of an Aromatic Hydrocarbon-Contaminated Soil. Appl Environ Microbiol 2015; 82:897-909. [PMID: 26590287 DOI: 10.1128/aem.03306-15] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 11/16/2015] [Indexed: 11/20/2022] Open
Abstract
Metagenomics allows the study of genes related to xenobiotic degradation in a culture-independent manner, but many of these studies are limited by the lack of genomic context for metagenomic sequences. This study combined a phenotypic screen known as substrate-induced gene expression (SIGEX) with whole-metagenome shotgun sequencing. SIGEX is a high-throughput promoter-trap method that relies on transcriptional activation of a green fluorescent protein (GFP) reporter gene in response to an inducing compound and subsequent fluorescence-activated cell sorting to isolate individual inducible clones from a metagenomic DNA library. We describe a SIGEX procedure with improved library construction from fragmented metagenomic DNA and improved flow cytometry sorting procedures. We used SIGEX to interrogate an aromatic hydrocarbon (AH)-contaminated soil metagenome. The recovered clones contained sequences with various degrees of similarity to genes (or partial genes) involved in aromatic metabolism, for example, nahG (salicylate oxygenase) family genes and their respective upstream nahR regulators. To obtain a broader context for the recovered fragments, clones were mapped to contigs derived from de novo assembly of shotgun-sequenced metagenomic DNA which, in most cases, contained complete operons involved in aromatic metabolism, providing greater insight into the origin of the metagenomic fragments. A comparable set of contigs was generated using a significantly less computationally intensive procedure in which assembly of shotgun-sequenced metagenomic DNA was directed by the SIGEX-recovered sequences. This methodology may have broad applicability in identifying biologically relevant subsets of metagenomes (including both novel and known sequences) that can be targeted computationally by in silico assembly and prediction tools.
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Yagur-Kroll S, Lalush C, Rosen R, Bachar N, Moskovitz Y, Belkin S. Escherichia coli bioreporters for the detection of 2,4-dinitrotoluene and 2,4,6-trinitrotoluene. Appl Microbiol Biotechnol 2013; 98:885-95. [PMID: 23615740 DOI: 10.1007/s00253-013-4888-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 03/17/2013] [Accepted: 03/30/2013] [Indexed: 11/25/2022]
Abstract
The primary explosive found in most land mines, 2,4,6-trinitrotoluene (2,4,6-TNT), is often accompanied by 2,4-dinitrotoluene (2,4-DNT) and 1,3-dinitrobenzene (1,3-DNB) impurities. The latter two compounds, being more volatile, have been reported to slowly leak through land mine covers and permeate the soil under which they are located, thus serving as potential indicators for buried land mines. We report on the construction of genetically engineered Escherichia coli bioreporter strains for the detection of these compounds, based on a genetic fusion between two gene promoters, yqjF and ybiJ, to either the green fluorescent protein gene GFPmut2 or to Photorhabdus luminescens bioluminescence luxCDABE genes. These two gene promoters were identified by exposing to 2,4-DNT a comprehensive library of about 2,000 E. coli reporter strains, each harboring a different E. coli gene promoter controlling a fluorescent protein reporter gene. Both reporter strains detected 2,4-DNT in an aqueous solution as well as in vapor form or when buried in soil. Performance of the yqjF-based sensor was significantly improved in terms of detection threshold, response time, and signal intensity, following two rounds of random mutagenesis in the promoter region. Both yqjF-based and ybiJ-based reporters were also induced by 2,4,6-TNT and 1,3-DNB. It was further demonstrated that both 2,4,6-TNT and 2,4-DNT are metabolized by E. coli and that the actual induction of both yqjF and ybiJ is caused by yet unidentified degradation products. This is the first demonstration of an E. coli whole-cell sensor strain for 2,4-DNT and 2,4,6-TNT, constructed using its own endogenous sensing elements.
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Affiliation(s)
- Sharon Yagur-Kroll
- Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
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