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Improved GFP Variants to Study Gene Expression in Haloarchaea

Born, Johannes ; Pfeifer, Felicitas (2019)
Improved GFP Variants to Study Gene Expression in Haloarchaea.
In: Frontiers in Microbiology, 2019, 10
Article, Secondary publication

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Type of entry: Secondary publication
Title: Improved GFP Variants to Study Gene Expression in Haloarchaea
Language: English
Date: 2019
Place of Publication: Darmstadt
Year of primary publication: 2019
Publisher: Frontiers
Journal or Publication Title: Frontiers in Microbiology
Volume of the journal: 10
Corresponding Links:
Origin: Secondary publication via sponsored Golden Open Access

The study of promoter activities in haloarchaea is carried out exclusively using enzymes as reporters. An alternative reporter is the gene encoding the Green Fluorescent Protein (GFP), a simple and fast tool for investigating promoter strengths. However, the GFP variant smRS-GFP, used to analyze protein stabilities in haloarchaea, is not suitable to quantify weak promoter activities, since the fluorescence signal is too low. We enhanced the fluorescence of smRS-GFP 3.3-fold by introducing ten amino acid substitutions, resulting in mGFP6. Using mGFP6 as reporter, we studied six haloarchaeal promoters exhibiting different promoter strengths. The strongest activity was observed with the housekeeping promoters Pfdx of the ferredoxin gene and P2 of the ribosomal 16S rRNA gene. Much lower activities were determined for the promoters of the p-vac region driving the expression of gas vesicle protein (gvp) genes in Halobacterium salinarum PHH1. The basal promoter strength dropped in the order PpA, PpO > PpF, PpD. All promoters showed a growth-dependent activity pattern. The GvpE-induced activities of PpA and PpD were high, but lower compared to the Pfdx or P2 promoter activities. The mGFP6 reporter was also used to investigate the regulatory effects of 50 -untranslated regions (50 -UTRs) of three different gvp mRNAs. A deletion of the 50 -UTR always resulted in an increased expression, implying a negative effect of the 50 -UTRs on translation. Our experiments confirmed mGFP6 as simple, fast and sensitive reporter to study gene expression in haloarchaea.

URN: urn:nbn:de:tuda-tuprints-92450
Classification DDC: 500 Science and mathematics > 570 Life sciences, biology
Divisions: 10 Department of Biology > Microbiology and Archaea
Date Deposited: 31 Oct 2019 13:20
Last Modified: 13 Dec 2022 10:29
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/9245
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