This domain is found at the N terminus of several sigma54- dependent transcriptional activators including PrpR, which activates catabolism of propionate.

1: The methylcitric acid pathway in Ralstonia eutropha: new genes identified involved in propionate metabolism. Bramer CO, Steinbuchel A; Microbiology 2001;147:2203-2214. PMID:11495997

2: Enzymatic synthesis of 2-O-alpha-D-mannopyranosyl-methyl-alpha-D-mannopyranoside by a cell-free particulate system of Mycobacterium smegmatis. Schultz JC, Takayama K; Biochim Biophys Acta 1976;428:563-572. PMID:6051

3: Propionyl coenzyme A is a common intermediate in the 1,2-propanediol and propionate catabolic pathways needed for expression of the prpBCDE operon during growth of Salmonella enterica on 1,2-propanediol. Palacios S, Starai VJ, Escalante-Semerena JC; J Bacteriol 2003;185:2802-2810. PMID:12700259

4: prpR, ntrA, and ihf functions are required for expression of the prpBCDE operon, encoding enzymes that catabolize propionate in Salmonella enterica serovar typhimurium LT2. Palacios S, Escalante-Semerena JC; J Bacteriol 2000;182:905-910. PMID:10648513