Laboratory analysis demonstrates direct GlnR transcriptional repression of gluconeogenic pckA in actinomycetes, uncovering cross-regulation between central nitrogen and carbon metabolism.
In most actinomycetes, GlnR governs both nitrogen and non-nitrogen metabolisms (e.g., carbon, phosphate, and secondary metabolisms). Although GlnR has been recognized as a global regulator, its regulatory role in central carbon metabolism [e.g., glycolysis, gluconeogenesis, and the tricarboxylic acid (TCA) cycle] is largely unknown. In this study, we characterized GlnR as a direct transcriptional repressor of the
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