Members of this family belong to glycosyl transferase family 20 [1]. OtsA (Trehalose-6-phosphate synthase) is homologous to regions in the subunits of yeast trehalose-6-phosphate synthase/phosphate complex, [2].

1: A classification of nucleotide-diphospho-sugar glycosyltransferases based on amino acid sequence similarities Campbell JA, Davies GJ, Bulone V, Henrissat B; Biochem J 1997;326:929-939. PMID:9334165

2: Analysis of the otsBA operon for osmoregulatory trehalose synthesis in Escherichia coli and homology of the OtsA and OtsB proteins to the yeast trehalose-6-phosphate synthase/phosphatase complex. Kaasen I, McDougall J, Strom AR; Gene 1994;145:9-15. PMID:8045430