This family includes O-antigen polysaccharide polymerases [1]. These enzymes link O-units via a glycosidic linkage to form a long O-antigen [2]. These enzymes vary in specificity and sequence [2].

1: Escherichia coli serogroup O2 and O28ac O-antigen gene cluster sequences and detection of pathogenic E. coli O2 and O28ac by PCR. Fratamico PM, Yan X, Liu Y, DebRoy C, Byrne B, Monaghan A, Fanning S, Bolton D; Can J Microbiol. 2010;56:308-316. PMID:20453897

2: Biosynthesis of O-antigens: genes and pathways involved in nucleotide sugar precursor synthesis and O-antigen assembly. Samuel G, Reeves P; Carbohydr Res. 2003;338:2503-2519. PMID:14670712