Riboswitches are structured RNA domains commonly located in the 52 untranslated regions (UTRs) of messenger RNAs where they selectively bind target metabolites and regulate gene expression. We have discovered a fluoride-responsive riboswitch class which offers an unprecedented opportunity to establish the molecular basis for fluoride toxicity and its alleviation in organisms distributed among two of the three domains of life. Of particular interest is the study of fluoride riboswitches from bacterial species because of the likely implications for understanding the health effects of fluoride additives in water and dental hygiene products. We seek to provide a strong biochemical and genetic foundation for understanding how fluoride ions are sensed by many species and what genetic consequences occur when cells detect dangerous levels of this anion. Moreover, our experiments are designed to produce data that empowers other researchers who wish to conduct studies that elucidate the molecular basis of fluoride toxicity, anti-caries efficacy, and bacterial responses to fluoride exposure. We will conduct bioinformatics searches to discover additional fluoride- sensing RNAs, examine the biochemical and genetic functions of known and new-found fluoride riboswitches, and examine the function of gene products whose expression is regulated by fluoride. This knowledge will help assess the long-standing hypothesis that the antibacterial activity of fluoride contributes to the prevention of dental caries.
Fluoride is widely used as an additive to drinking water and oral hygiene products due to its efficacy in preventing tooth decay. Among the proposed mechanisms of fluoride action is its antibacterial activity at high concentrations in dental plaque We have discovered a novel fluoride sensing system in microorganisms that provides extraordinary opportunities to understand and exploit fluoride toxicity in bacteria.
Greenlee, Etienne B; Stav, Shira; Atilho, Ruben M et al. (2018) Challenges of ligand identification for the second wave of orphan riboswitch candidates. RNA Biol 15:377-390 |
Mirihana Arachchilage, Gayan; Sherlock, Madeline E; Weinberg, Zasha et al. (2018) SAM-VI RNAs selectively bind S-adenosylmethionine and exhibit similarities to SAM-III riboswitches. RNA Biol 15:371-378 |
Sherlock, Madeline E; Sudarsan, Narasimhan; Breaker, Ronald R (2018) Riboswitches for the alarmone ppGpp expand the collection of RNA-based signaling systems. Proc Natl Acad Sci U S A 115:6052-6057 |
Nelson, James W; Atilho, Ruben M; Sherlock, Madeline E et al. (2017) Metabolism of Free Guanidine in Bacteria Is Regulated by a Widespread Riboswitch Class. Mol Cell 65:220-230 |
Weinberg, Zasha; Nelson, James W; Lünse, Christina E et al. (2017) Bioinformatic analysis of riboswitch structures uncovers variant classes with altered ligand specificity. Proc Natl Acad Sci U S A 114:E2077-E2085 |
Sherlock, Madeline E; Breaker, Ronald R (2017) Biochemical Validation of a Third Guanidine Riboswitch Class in Bacteria. Biochemistry 56:359-363 |
Breaker, Ronald R; Atilho, Ruben M; Malkowski, Sarah N et al. (2017) The Biology of Free Guanidine As Revealed by Riboswitches. Biochemistry 56:345-347 |
Sherlock, Madeline E; Malkowski, Sarah N; Breaker, Ronald R (2017) Biochemical Validation of a Second Guanidine Riboswitch Class in Bacteria. Biochemistry 56:352-358 |
Li, Sanshu; Hwang, Xue Ying; Stav, Shira et al. (2016) The yjdF riboswitch candidate regulates gene expression by binding diverse azaaromatic compounds. RNA 22:530-41 |
Nelson, James W; Sudarsan, Narasimhan; Phillips, Grace E et al. (2015) Control of bacterial exoelectrogenesis by c-AMP-GMP. Proc Natl Acad Sci U S A 112:5389-94 |
Showing the most recent 10 out of 19 publications