This family of proteins contains the sugar isomerase enzymes ribose 5-phosphate isomerase B (rpiB), galactose isomerase subunit A (LacA) and galactose isomerase subunit B (LacB).

1: Ribose catabolism of Escherichia coli: characterization of the rpiB gene encoding ribose phosphate isomerase B and of the rpiR gene, which is involved in regulation of rpiB expression. Sorensen KI, Hove-Jensen B; J Bacteriol 1996;178:1003-1011. PMID:8576032

2: Structure of ribose 5-phosphate isomerase from Plasmodium falciparum. Holmes MA, Buckner FS, Van Voorhis WC, Verlinde CL, Mehlin C, Boni E, DeTitta G, Luft J, Lauricella A, Anderson L, Kalyuzhniy O, Zucker F, Schoenfeld LW, Earnest TN, Hol WG, Merritt EA; Acta Crystallogr Sect F Struct Biol Cryst Commun. 2006;62:427-431. PMID:16682767