This family includes uncharacterised proteins predominantly found in Proteobacteria, such as Swiss:Q9I380 from Pseudomonas aeruginosa. This protein folds into a five-stranded antiparallel beta -sheet sandwiched between two short alpha-helices [1].

1: The AEROPATH project targeting Pseudomonas aeruginosa: crystallographic studies for assessment of potential targets in early-stage drug discovery. Moynie L, Schnell R, McMahon SA, Sandalova T, Boulkerou WA, Schmidberger JW, Alphey M, Cukier C, Duthie F, Kopec J, Liu H, Jacewicz A, Hunter WN, Naismith JH, Schneider G; Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013;69:25-34. PMID:23295481