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A Synthetic Riboswitch to Regulate Haloarchaeal Gene Expression

Born, Johannes ; Weitzel, Kerstin ; Süß, Beatrix ; Pfeifer, Felicitas (2021):
A Synthetic Riboswitch to Regulate Haloarchaeal Gene Expression. (Publisher's Version)
In: Frontiers in Microbiology, 12, Frontiers, e-ISSN 1664-302X,
DOI: 10.26083/tuprints-00019402,
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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: A Synthetic Riboswitch to Regulate Haloarchaeal Gene Expression
Language: English
Abstract:

In recent years, synthetic riboswitches have become increasingly important to construct genetic circuits in all three domains of life. In bacteria, synthetic translational riboswitches are often employed that modulate gene expression by masking the Shine-Dalgarno (SD) sequence in the absence or presence of a cognate ligand. For (halo-)archaeal translation, a SD sequence is not strictly required. The application of synthetic riboswitches in haloarchaea is therefore limited so far, also because of the molar intracellular salt concentrations found in these microbes. In this study, we applied synthetic theophylline-dependent translational riboswitches in the archaeon Haloferax volcanii. The riboswitch variants A through E and E* were chosen since they not only mask the SD sequence but also the AUG start codon by forming a secondary structure in the absence of the ligand theophylline. Upon addition of the ligand, the ribosomal binding site and start codon become accessible for translation initiation. Riboswitch E mediated a dose-dependent, up to threefold activation of the bgaH reporter gene expression. Raising the salt concentration of the culture media from 3 to 4 M NaCl resulted in a 12-fold increase in the switching capacity of riboswitch E, and switching activity increased up to 26-fold when the cultivating temperature was reduced from 45 to 30°C. To construct a genetic circuit, riboswitch E was applied to regulate the synthesis of the transcriptional activator GvpE allowing a dose-dependent activation of the mgfp6 reporter gene under PpA promoter control.

Journal or Publication Title: Frontiers in Microbiology
Journal volume: 12
Publisher: Frontiers
Collation: 13 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 570 Biowissenschaften, Biologie
Divisions: 10 Department of Biology > Microbiology and Archaea
10 Department of Biology > Synthetic Genetic Circuits
Date Deposited: 30 Aug 2021 12:26
Last Modified: 30 Aug 2021 12:27
DOI: 10.26083/tuprints-00019402
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-194028
Additional Information:

Keywords: theophylline-dependent riboswitch E, Haloferax volcanii, transcriptional regulator GvpE, haloarchaeal Shine-Dalgarno sequence, gas vesicle gene promoter

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19402
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