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Conditional gene expression by controlling translation with tetracycline-binding aptamers.

Suess, Beatrix and Hanson, Shane and Berens, Christian and Fink, Barbara and Schroeder, Renée and Hillen, Wolfgang (2003):
Conditional gene expression by controlling translation with tetracycline-binding aptamers.
In: Nucleic acids research, pp. 1853-8, 31, (7), ISSN 1362-4962,
[Article]

Abstract

We present a conditional gene expression system in Saccharomyces cerevisiae which exploits direct RNA-metabolite interactions as a mechanism of genetic control. We inserted preselected tetracycline (tc) binding aptamers into the 5'-UTR of a GFP encoding mRNA. While aptamer insertion generally reduces GFP expression, one group of aptamers displayed an additional, up to 6-fold, decrease in fluorescence upon tc addition. Regulation is observed for aptamers inserted cap-proximal or near the start codon, but is more pronounced from the latter position. Increasing the thermodynamic stability of the aptamer augments regulation but reduces expression of GFP. Decreasing the stability leads to the opposite effect. We defined nucleotides which influence the regulatory properties of the aptamer. Exchanging a nucleotide probably involved in tc binding only influences regulation, while mutations at another position alter expression in the absence of tc, without affecting regulation. Thus, we have developed and characterized a regulatory system which is easy to establish and controlled by a non-toxic, small ligand with good cell permeability.

Item Type: Article
Erschienen: 2003
Creators: Suess, Beatrix and Hanson, Shane and Berens, Christian and Fink, Barbara and Schroeder, Renée and Hillen, Wolfgang
Title: Conditional gene expression by controlling translation with tetracycline-binding aptamers.
Language: English
Abstract:

We present a conditional gene expression system in Saccharomyces cerevisiae which exploits direct RNA-metabolite interactions as a mechanism of genetic control. We inserted preselected tetracycline (tc) binding aptamers into the 5'-UTR of a GFP encoding mRNA. While aptamer insertion generally reduces GFP expression, one group of aptamers displayed an additional, up to 6-fold, decrease in fluorescence upon tc addition. Regulation is observed for aptamers inserted cap-proximal or near the start codon, but is more pronounced from the latter position. Increasing the thermodynamic stability of the aptamer augments regulation but reduces expression of GFP. Decreasing the stability leads to the opposite effect. We defined nucleotides which influence the regulatory properties of the aptamer. Exchanging a nucleotide probably involved in tc binding only influences regulation, while mutations at another position alter expression in the absence of tc, without affecting regulation. Thus, we have developed and characterized a regulatory system which is easy to establish and controlled by a non-toxic, small ligand with good cell permeability.

Journal or Publication Title: Nucleic acids research
Volume: 31
Number: 7
Divisions: 10 Department of Biology > Synthetic Genetic Circuits
10 Department of Biology
Date Deposited: 22 Feb 2012 10:41
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