This family includes the OrfY protein from the hyperthermophilic archaeum Thermoproteus tenax. This protein co-occurs with the treS/P protein in an operon regulating the synthesis of trehalose. The structure of this protein shows it contains an internal duplication [1].

1: Challenging the state of the art in protein structure prediction: Highlights of experimental target structures for the 10th Critical Assessment of Techniques for Protein Structure Prediction Experiment CASP10. Kryshtafovych A, Moult J, Bales P, Bazan JF, Biasini M, Burgin A, Chen C, Cochran FV, Craig TK, Das R, Fass D, Garcia-Doval C, Herzberg O, Lorimer D, Luecke H, Ma X, Nelson DC, van Raaij MJ, Rohwer F, Segall A, Seguritan V, Zeth K, Schwede T; Proteins. 2014;82:26-42. PMID:24318984