Members of this family are involved in modifying bases in RNA molecules. They carry out the conversion of uracil bases to pseudouridine. This family includes TruB, a pseudouridylate synthase that specifically converts uracil 55 to pseudouridine in most tRNAs. This family also includes Cbf5p that modifies rRNA [2].

1: Purification, cloning, and properties of the tRNA psi 55 synthase from Escherichia coli. Nurse K, Wrzesinski J, Bakin A, Lane BG, Ofengand J; RNA 1995;1:102-112. PMID:7489483

2: The box H + ACA snoRNAs carry Cbf5p, the putative rRNA pseudouridine synthase. Lafontaine DLJ, Bousquet-Antonelli C, Henry Y, Caizergues-Ferrer M, Tollervey D; Genes Dev 1998;12:527-537. PMID:9472021