The RNA thermometer motif ROSE-G regulates ABC transporter gene expression in bacteria

Area of Science:

• Molecular Biology
• Bacterial Genetics
• RNA Biology

Background:

• RNA thermometers are non-coding RNA elements that control gene expression in response to temperature changes.
• The ROSE-like element is a known RNA thermometer found upstream of ATP-binding cassette (ABC) transporter genes in bacteria.
• ABC transporters are crucial transmembrane proteins involved in substrate transport across cell membranes.

Purpose of the Study:

• To identify and characterize novel RNA motifs involved in post-transcriptional gene regulation.
• To investigate the distribution and function of RNA thermometers in bacterial systems.
• To expand the understanding of RNA-mediated regulation of ABC transporter genes.

Main Methods:

• Structure-guided bioinformatics analysis to identify novel RNA motifs.
• Structure probing, biochemical assays, and cellular experiments to validate RNA thermometer function.
• Comparative genomics to assess the distribution of the identified motif across bacterial species.

Main Results:

• Discovery of a novel RNA motif, ROSE-G, closely related to the canonical ROSE-like element.
• The ROSE-G motif is widespread upstream of ABC transporter genes in diverse bacteria.
• Experimental evidence confirms ROSE-G functions as a temperature-sensing RNA thermometer.

Conclusions:

• The study identifies ROSE-G as a new class of bacterial RNA thermometer.
• This discovery broadens the known repertoire of RNA thermometers.
• The findings emphasize the significant role of RNA thermometers in the post-transcriptional regulation of bacterial ABC transporters.