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The function and regulation of AdhE in the important probiotic genusLactobacillus are rarely reported. Here we demonstrated that AdhE is responsible for sorbitol and mannitol utilization and is cross-regulated by two transcriptional regulators inL. plantarum NF92, which had not been reported previously. This is important forL. plantarum to compete and survive in some harsh environments in which sorbitol or mannitol could be used as carbon source. A novel transcriptional regulator AcrR was identified to be important to promote the expression ofadhE , which was unknown before. The cross-regulation ofadhE by AcrR and Rex is important to balance the level of NADH in the cell during sorbitol or mannitol utilization.

applied and environmental microbiology

AcrR and Rex Control Mannitol and Sorbitol Utilization through Their Cross-Regulation of Aldehyde-Alcohol Dehydrogenase (AdhE) in Lactobacillus plantarum