Represses its own transcription and the expression of nmoA, a nitronate monooxygenase. The nmoA-nmoR intergenic region is the sole direct binding site of NmoR across the P.aeruginosa PAO1 genome. Other genes seem also to be under negative control of NmoR, especially PA1225 and the hemO gene. The PA1225 gene, encoding a quinone oxidoreductase, is the most highly up-regulated gene in cells lacking NmoR. Belongs to the LysR transcriptional regulatory family.