This family of proteins mainly found in Proteobacteria includes RsaM from Burkholderia cenocepacia. RsaM is a transcriptional regulator involved in quorum sensing (QS). This protein folds into a unique domain with a five-stranded antiparallel beta-sheet that wraps around two alpha-helices [1,2].

1: RsaM: a transcriptional regulator of Burkholderia spp. with novel fold. Michalska K, Chhor G, Clancy S, Jedrzejczak R, Babnigg G, Winans SC, Joachimiak A; FEBS J. 2014;281:4293-4306. PMID:24916958

2: Two rsaM Homologues Encode Central Regulatory Elements Modulating Quorum Sensing in Burkholderia thailandensis. Le Guillouzer S, Groleau MC, Deziel E; J Bacteriol. 2018; [Epub ahead of print] PMID:29507087