Abstract
LeuO is a LysR-type transcriptional regulator in bacteria. It determines the regulation of numerous genes related to stress response and virulence. Thus, four exciting areas of research are discussed herein. One pertains the leuO gene, which in S. Typhi and in E. coli contains multiple forward promoters as well as reverse promoters, even though it is expressed at very low levels, that is, it is quiescent. Such multiplicity might allow for a greater plasticity in regulation, or even aid in maintaining the quiescence, in processes that appear to involve many nucleoid-associated proteins in a second area of opportunity. A third one relates to the effector-binding domain of the LeuO regulator, which is highly conserved in S. enterica and in E. coli and determines its activity as a regulator of transcription. A fourth area regards the role of the CRISPR-Cas system in gene regulation in S. Typhi; a system that is regulated by LeuO.
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