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Methods Mol Biol ; 2516: 113-141, 2022.
Article in English | MEDLINE | ID: mdl-35922625

ABSTRACT

In prokaryotes, transcription factors (TFs) are of uttermost importance for the regulation of gene expression. However, the majority of TFs are not characterized today, which hampers both the understanding of fundamental processes and the development of TF-based applications, such as biosensors, used in metabolic engineering, synthetic biology, diagnostics, etc. One way of analyzing TFs is through in vivo screening, enabling the study of TF-promoter interactions, ligand inducibility, and ligand specificity in a high-throughput fashion. Here, an approach is described for the selection and cloning of TF-promoter pairs, the development of a reporter system, and the measurement and analysis of fluorescent reporter assays. Furthermore, the importance of a suitable inducible plasmid system is illustrated together with prospective adaptations to modify a reporter system's output signal. The given approach can be used for the investigation of native, heterologous, or even artificially created TFs in Escherichia coli, and can be extended toward use in other microorganisms.


Subject(s)
Biosensing Techniques , Escherichia coli Proteins , Biosensing Techniques/methods , Escherichia coli/metabolism , Escherichia coli Proteins/metabolism , Ligands , Prospective Studies , Transcription Factors/genetics , Transcription Factors/metabolism
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