Activates transcription. The consensus DNA-binding site of this transcriptional regulator is 5'-WWGTGAN(5-7)ACACWW-3' in which W is A or T and N is G, A, T or C. Regulated genes include those encoding proteins involved in nutrient and energy supply, redox control and polyadenylation of mRNA (PubMed:18699868). Also regulates genes involved in oxidative stress response such as genes encoding manganese superoxide dismutase and catalase, and genes encoding a protein involved in nucleotide excision repair of damaged DNA and putative proteins involved in redox control, protein degradation and transcriptional regulation (PubMed:21054499). Homodimer. Increased expression during the stationary phase when grown at 70 degrees Celsius (PubMed:18699868). Increased expression during the logarithmic growth phase in oxidative stress and upon treatment with diamide. Increased expression by heavy metal ion, antibiotic, high salt and organic solvent stresses (PubMed:21054499). Viable, but has growth defects, particularly when grown in a synthetic medium. Increased sensitivity to disulfide stress. Decreased expression of TTHA0986, TTHA0770, TTHA0337, TTHA1028, TTHA0654, TTHA0655, TTHA0769, TTHA0425, TTHA0634, TTHA0635, TTHA0636, TTHA0637, TTHA0638, TTHA0570, TTHA0030, TTHA0460, TTHB243, TTHA1128, TTHA0035, TTHA0520 and TTHA1803 genes.