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Kraus L, Duchardt-Ferner E, Bräuchle E, Fürbacher S, Kelvin D, Marx H, Boussebayle A, Maurer LM, Bofill-Bosch C, Wöhnert J, Suess B. Development of a novel tobramycin dependent riboswitch. Nucleic Acids Res 2023; 51:11375-11385. [PMID: 37791877 PMCID: PMC10639043 DOI: 10.1093/nar/gkad767] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 08/30/2023] [Accepted: 09/12/2023] [Indexed: 10/05/2023] Open
Abstract
We herein report the selection and characterization of a new riboswitch dependent on the aminoglycoside tobramycin. Its dynamic range rivals even the tetracycline dependent riboswitch to be the current best performing, synthetic riboswitch that controls translation initiation. The riboswitch was selected with RNA Capture-SELEX, a method that not only selects for binding but also for structural changes in aptamers on binding. This study demonstrates how this method can fundamentally reduce the labour required for the de novo identification of synthetic riboswitches. The initially selected riboswitch candidate harbours two distinct tobramycin binding sites with KDs of 1.1 nM and 2.4 μM, respectively, and can distinguish between tobramycin and the closely related compounds kanamycin A and B. Using detailed genetic and biochemical analyses and 1H NMR spectroscopy, the proposed secondary structure of the riboswitch was verified and the tobramycin binding sites were characterized. The two binding sites were found to be essentially non-overlapping, allowing for a separate investigation of their contribution to the activity of the riboswitch. We thereby found that only the high-affinity binding site was responsible for regulatory activity, which allowed us to engineer a riboswitch from only this site with a minimal sequence size of 33 nt and outstanding performance.
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Affiliation(s)
- Leon Kraus
- Fachbereich Biologie, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
- Centre for Synthetic Biology, TU Darmstadt, 64287 Darmstadt, Germany
| | - Elke Duchardt-Ferner
- Institut für Molekulare Biowissenschaften und Zentrum für Biomolekulare Magnetische Resonanz (BMRZ), Goethe-Universität Frankfurt, Max-von-Laue Straße 9, 60438 Frankfurt, Germany
| | - Eric Bräuchle
- Fachbereich Biologie, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
| | - Simon Fürbacher
- Fachbereich Biologie, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
| | - Daniel Kelvin
- Fachbereich Biologie, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
- Centre for Synthetic Biology, TU Darmstadt, 64287 Darmstadt, Germany
| | - Hans Marx
- Fachbereich Biologie, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
- Institute of Microbiology and Microbial Biotechnology BOKU University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Adrien Boussebayle
- Fachbereich Biologie, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
- Interdisciplinary Nanoscience Center (iNANO), Gustav Wieds Vej 14, Aarhus University, DK-8000 Aarhus, Denmark
| | - Lisa-Marie Maurer
- Fachbereich Biologie, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
- Centre for Synthetic Biology, TU Darmstadt, 64287 Darmstadt, Germany
- Institut für Molekulare Biowissenschaften und Zentrum für Biomolekulare Magnetische Resonanz (BMRZ), Goethe-Universität Frankfurt, Max-von-Laue Straße 9, 60438 Frankfurt, Germany
| | - Cristina Bofill-Bosch
- Fachbereich Biologie, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
| | - Jens Wöhnert
- Institut für Molekulare Biowissenschaften und Zentrum für Biomolekulare Magnetische Resonanz (BMRZ), Goethe-Universität Frankfurt, Max-von-Laue Straße 9, 60438 Frankfurt, Germany
| | - Beatrix Suess
- Fachbereich Biologie, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
- Centre for Synthetic Biology, TU Darmstadt, 64287 Darmstadt, Germany
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Boussebayle A, Torka D, Ollivaud S, Braun J, Bofill-Bosch C, Dombrowski M, Groher F, Hamacher K, Suess B. Next-level riboswitch development-implementation of Capture-SELEX facilitates identification of a new synthetic riboswitch. Nucleic Acids Res 2019; 47:4883-4895. [PMID: 30957848 PMCID: PMC6511860 DOI: 10.1093/nar/gkz216] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 03/15/2019] [Accepted: 04/04/2019] [Indexed: 02/06/2023] Open
Abstract
The development of synthetic riboswitches has always been a challenge. Although a number of interesting proof-of-concept studies have been published, almost all of these were performed with the theophylline aptamer. There is no shortage of small molecule-binding aptamers; however, only a small fraction of them are suitable for RNA engineering since a classical SELEX protocol selects only for high-affinity binding but not for conformational switching. We now implemented RNA Capture-SELEX in our riboswitch developmental pipeline to integrate the required selection for high-affinity binding with the equally necessary RNA conformational switching. Thus, we successfully developed a new paromomycin-binding synthetic riboswitch. It binds paromomycin with a KD of 20 nM and can discriminate between closely related molecules both in vitro and in vivo. A detailed structure-function analysis confirmed the predicted secondary structure and identified nucleotides involved in ligand binding. The riboswitch was further engineered in combination with the neomycin riboswitch for the assembly of an orthogonal Boolean NOR logic gate. In sum, our work not only broadens the spectrum of existing RNA regulators, but also signifies a breakthrough in riboswitch development, as the effort required for the design of sensor domains for RNA-based devices will in many cases be much reduced.
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Affiliation(s)
- Adrien Boussebayle
- Department of Biology, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
| | - Daniel Torka
- Department of Biology, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
| | - Sandra Ollivaud
- Department of Biology, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
| | - Johannes Braun
- Department of Biology, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
| | - Cristina Bofill-Bosch
- Department of Biology, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
| | - Max Dombrowski
- Computational Biology and Simulation, Department of Biology, TU Darmstadt, 64287 Darmstadt, Germany
| | - Florian Groher
- Department of Biology, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
| | - Kay Hamacher
- Computational Biology and Simulation, Department of Biology, TU Darmstadt, 64287 Darmstadt, Germany
- Department of Physics, Department of Computer Science, TU Darmstadt, 64287 Darmstadt, Germany
| | - Beatrix Suess
- Department of Biology, TU Darmstadt, Schnittspahnstrasse 10, 64287 Darmstadt, Germany
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Groher F, Bofill-Bosch C, Schneider C, Braun J, Jager S, Geißler K, Hamacher K, Suess B. Riboswitching with ciprofloxacin-development and characterization of a novel RNA regulator. Nucleic Acids Res 2018; 46:2121-2132. [PMID: 29346617 PMCID: PMC5829644 DOI: 10.1093/nar/gkx1319] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 12/22/2017] [Accepted: 12/28/2017] [Indexed: 11/24/2022] Open
Abstract
RNA molecules play important and diverse regulatory roles in the cell. Inspired by this natural versatility, RNA devices are increasingly important for many synthetic biology applications, e.g. optimizing engineered metabolic pathways, gene therapeutics or building up complex logical units. A major advantage of RNA is the possibility of de novo design of RNA-based sensing domains via an in vitro selection process (SELEX). Here, we describe development of a novel ciprofloxacin-responsive riboswitch by in vitro selection and next-generation sequencing-guided cellular screening. The riboswitch recognizes the small molecule drug ciprofloxacin with a KD in the low nanomolar range and adopts a pseudoknot fold stabilized by ligand binding. It efficiently interferes with gene expression both in lower and higher eukaryotes. By controlling an auxotrophy marker and a resistance gene, respectively, we demonstrate efficient, scalable and programmable control of cellular survival in yeast. The applied strategy for the development of the ciprofloxacin riboswitch is easily transferrable to any small molecule target of choice and will thus broaden the spectrum of RNA regulators considerably.
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Affiliation(s)
- Florian Groher
- Synthetic Genetic Circuits, Dept. of Biology, TU Darmstadt, Darmstadt, Germany
| | | | | | - Johannes Braun
- Synthetic Genetic Circuits, Dept. of Biology, TU Darmstadt, Darmstadt, Germany
| | - Sven Jager
- Computational Biology and Simulation, Dept. of Biology, TU Darmstadt, Darmstadt, Germany
| | - Katharina Geißler
- Synthetic Genetic Circuits, Dept. of Biology, TU Darmstadt, Darmstadt, Germany
| | - Kay Hamacher
- Computational Biology and Simulation, Dept. of Biology, TU Darmstadt, Darmstadt, Germany
- Dept. of Physics, Dept. of Computer Science, TU Darmstadt, Darmstadt, Germany
| | - Beatrix Suess
- Synthetic Genetic Circuits, Dept. of Biology, TU Darmstadt, Darmstadt, Germany
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