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Genome-wide transcriptomic data obtained in RNA-seq experiments can serve as a reliable source for identification of novel regulatory elements such as riboswitches and promoters. Riboswitches are parts of the 5′ untranslated region of mRNA molecules that can specifically bind various metabolites and control gene expression. For that reason, they have become an attractive tool for engineering biological systems, especially for the regulation of metabolic fluxes in industrial microorganisms. Promoters in the genomes of prokaryotes are located upstream of transcription start sites and their sequences are easily identifiable based on the primary transcriptome data.  Bacillus methanolicus  MGA3 is a candidate for use as an industrial workhorse in methanol-based bioprocesses and its metabolism has been studied in systems biology approaches in recent years, including transcriptome characterization through RNA-seq. Here, we identify a putative lysine riboswitch in  B. methanolicus,  and test and characterize it. We also select and experimentally verify 10 putative  B. methanolicus -derived promoters differing in their predicted strength and present their functionality in combination with the lysine riboswitch. We further explore the potential of a  B. subtilis -derived purine riboswitch for regulation of gene expression in the thermophilic  B. methanolicus , establishing a novel tool for inducible gene expression in this bacterium.

Developing a Riboswitch-Mediated Regulatory System for Metabolic Flux Control in Thermophilic Bacillus methanolicus