AraR Transcription Factor: The Mastermind behind Sugar Metabolism and Acid Tolerance

Microorganism employs sophisticated strategies to adapt to acidic environments, with transcription factors occupying pivotal nodes within their hierarchical regulatory networks. In this study, we performed functional characterization of the AraR transcription factor LP_RS14895 via integrated multiomics approaches. The results revealed the pivotal role of AraR in acid tolerance and carbohydrate utilization (including arabinose, glucose, fructose, ribose, mannose, and trehalose). RNA sequencing revealed 40 acid-responsive targets that were enriched in pathways related to pentose/glucuronate interconversions and amino sugar and nucleotide sugar metabolism. A genome-wide binding analysis via DAP-seq identified 1,279 interaction sites; the results highlighted the most significantly enriched motif, “ARCCMATMAHC”. These findings suggest that AraR plays a crucial role in regulating sugar metabolism and acid adaptation, offering mechanistic insights into microbial stress responses and providing a valuable method for addressing inhibitory processes of carbohydrate utilization under high-acid conditions.