HTH-type transcriptional regulator AldR

UniProtKB accession:  O33321

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UniProtKB description:  Transcriptional regulator that might play a role under hypoxic conditions (Probable). Regulates the expression of ald, which encodes L-alanine dehydrogenase (PubMed:26195594, PubMed:27006398). Serves as both an activator for ald expression in the presence of L-alanine and a repressor in the absence of L-alanine (PubMed:26195594). Acts by binding directly to the upstream region of the ald gene (PubMed:27006398). Four AldR-binding sites (O2, O1, O4 and O3) were identified upstream of the ald gene (PubMed:26195594). O2, O1 and O4 are required for the induction of ald expression by alanine, while O3 is directly involved in the repression of ald expression, by occluding the access of RNA polymerase to the ald promoter (PubMed:26195594). In addition to O3, both O1 and O4 are also necessary for full repression of ald expression in the absence of alanine (PubMed:26195594).