HTH-type transcriptional regulatory protein TyrR

UniProtKB accession:  P07604

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Dual transcriptional regulator of the TyrR regulon, which includes a number of genes coding for proteins involved in the biosynthesis or transport of the three aromatic amino acids, phenylalanine, tyrosine and tryptophan (PubMed:4887504, PubMed:4399341, PubMed:334742, PubMed:1860819, PubMed:8449883, PubMed:7961453, PubMed:7798138, PubMed:14614536, PubMed:15049824). These three aromatic amino acids act as effectors which bind to the TyrR protein to form an active regulatory protein (PubMed:4399341, PubMed:334742, PubMed:1860819, PubMed:8106498, PubMed:7961453). Modulates the expression of at least eight unlinked transcription units, including aroF, aroG, aroLM, aroP, mtr, tyrA, tyrB and tyrP (PubMed:4887504, PubMed:4399341, PubMed:334742, PubMed:1860819, PubMed:8449883, PubMed:7961453, PubMed:7798138, PubMed:14614536, PubMed:15049824). In most cases TyrR acts as a repressor, but positive effects have been observed on the tyrP gene, which is repressed in the presence of tyrosine and activated at high phenylalanine concentrations (PubMed:334742, PubMed:1860819, PubMed:8449883, PubMed:7798138, PubMed:15049824, PubMed:8407813). Is also involved in activation, but not repression, of mtr expression in association with phenylalanine or tyrosine (PubMed:2061290, PubMed:8449883, PubMed:8407813). Acts by binding specifically to TyrR boxes in the promoter region of the target genes (PubMed:1860819, PubMed:8449883, PubMed:7961453, PubMed:8947567, PubMed:10197993).