original_query: What is the function of the PreQ1-I riboswitch in bacteria?
query: What is the function of the PreQ1-I riboswitch in bacteria?
answer: The PreQ1-I riboswitch in bacteria regulates the expression of genes involved in the biosynthesis of queuosine (Q) from GTP.  It binds to the intermediate pre-queuosine1 (preQ1) and, depending on preQ1 concentration, it influences transcription or translation initiation.