The PaaX-type repressor MeqR2 of Arthrobacter sp. strain Rue61a, involved in the regulation of quinaldine catabolism, binds to its own promoter and to catabolic promoters and specifically responds to anthraniloyl coenzyme A.

ABSTRACT: The genes coding for quinaldine catabolism in Arthrobacter sp. strain Rue61a are clustered on the linear plasmid pAL1 in two upper pathway operons (meqABC and meqDEF) coding for quinaldine conversion to anthranilate and a lower pathway operon encoding anthranilate degradation via coenzyme A (CoA) thioester intermediates. The meqR2 gene, located immediately downstream of the catabolic genes, codes for a PaaX-type transcriptional repressor. MeqR2, purified as recombinant fusion protein, forms a dimer in solution and shows specific and cooperative binding to promoter DNA in vitro. DNA fragments recognized by MeqR2 contained a highly conserved palindromic motif, 5'-TGACGNNCGTcA-3', which is located at positions -35 to -24 of the two promoters that control the upper pathway operons, at position

SUBMITTER: Niewerth H 

PROVIDER: S-EPMC3571316 | biostudies-literature | 2013 Mar

REPOSITORIES: biostudies-literature