Members of this family are integral membrane proteins [1]. Many members of the family are implicated in production of polysaccharide. The family includes RfbX part of the O antigen biosynthesis operon [2]. The family includes SpoVB from Bacillus subtilis Swiss:Q00758, which is involved in spore cortex biosynthesis [3].

1: Analysis of the Rhizobium meliloti genes exoU, exoV, exoW, exoT, and exoI involved in exopolysaccharide biosynthesis and nodule invasion: exoU and exoW probably encode glucosyltransferases. Becker A, Kleickmann A, Kuster H, Keller M, Arnold W, Puhler A; Mol Plant Microbe Interact. 1993;6:735-744. PMID:8118055

2: Genetic analysis of the O-specific lipopolysaccharide biosynthesis region (rfb) of Escherichia coli K-12 W3110: identification of genes that confer group 6 specificity to Shigella flexneri serotypes Y and 4a. Yao Z, Valvano MA; J Bacteriol 1994;176:4133-4143. PMID:7517390

3: Cloning, characterization, and expression of the spoVB gene of Bacillus subtilis. Popham DL, Stragier P; J Bacteriol 1991;173:7942-7949. PMID:1744050