Under iron limitation, represses the acn (aconitase), catA (catechol 1,2 dioxygenase), leuCD (isopropylmalate dehydratase), narKGHJI (nitrite/nitrate transporter and nitrate reductase), sdhCAB (succinate dehydrogenase), pta (phosphotransacetylase) and katA (catalase) genes. Repressed by DtxR under iron excess. Extended N-terminus.