Mannosyltransferase OCH1 or related enzyme [Cell wall/membrane/envelope biogenesis].

Capsular polysaccharide synthesis protein. This family consists of several capsular polysaccharide proteins. Capsular polysaccharide (CPS) is a major virulence factor in Streptococcus pneumoniae.

Glycosyltransferase sugar-binding region containing DXD motif. The DXD motif is a short conserved motif found in many families of glycosyltransferases, which add a range of different sugars to other sugars, phosphates and proteins. DXD-containing glycosyltransferases all use nucleoside diphosphate sugars as donors and require divalent cations, usually manganese. The DXD motif is expected to play a carbohydrate binding role in sugar-nucleoside diphosphate and manganese dependent glycosyltransferases.

TcdA/TcdB catalytic glycosyltransferase domain. This domain represents the N-terminal glycosyltransferase from a set of toxins found in some bacteria. This domain in TcdB glycosylates the host RhoA protein.

LifA/Efa1-related large cytotoxin. Members of this family are large and almost certainly multifunctional proteins found in various pathogens from genus Chlamydia, about 3000 amino acids in size and related to lymphostatin (Efa1/LifA) from enteropathogenic Escherichia coli. Roles have been suggested for Efa1 (EHEC factor for adherence) in adhesion, so some members have been annotated as adherence proteins rather than cytotoxins.