nrdR MKCPYCSSPDSRVINSRPSDDGASIRRRRECLTCTRRFTTYERAQLEPLMVVKRSGVREAFNPDKLLRGLALASEKRPVEEAALRTFAYSFEDEVQGGEIPTEEIGRRAMTFLRPLDDVAYIRFASVYRDFDSLERFIEEIRGLKGHEDEAPKSDPA Transcriptional repressor NrdR NRDR_DEIRA DR_0087 157 Negatively regulates transcription of bacterial ribonucleotide reductase nrd genes and operons by binding to NrdR- boxes (By similarity).