A recently discovered class of these things binds two prime-deoxyguanosine and belongs to their purine family.
The crcB motif is one of these things that binds to the fluoride ion. The labs of both Tina Henkin and Ron Breaker, who hypothesized and named these things, are particularly known for studying these things. Types I and II of these things are differentiated by the presence of a single or bipartite binding pocket, and type II includes ones that bind to SAM and TPP. A recently discovered class of these things binds two prime-deoxyguanosine and belongs to their purine family. They are most often found in the five prime-untranslated region and contain a switching sequence that flips between their aptamer domain and expression platform. These cis-acting elements most often act by forming a transcription       terminating stem-loop structure or sequestering the Shine-Dalgarno sequence. For 10 points, identify these bacterial regulatory elements in mRNA that bind to metabolites, causing a conformational change and controlling mRNA expression.
The crcB motif is one of these things that binds to the fluoride ion.
riboswitches [or ribofuses; prompt on mRNA]