GT88 members are LppGT, LppaGT (LpGT from strain Paris), LplGT, Lgt2 and Lgt3. Secondary structure elements from the LppGT structure are dark grey for the N-terminal domain, black for the central domain and light grey for the protrusion domain. Conserved catalytic glutamine residues are indicated with a black circle, the aspartic residues of the DxD motif are marked with a black star, amino acids interacting with UDP-glucose by direct hydrogen bonds or hydrophobic stacking interactions are highlighted with a black triangle, and amino acids interacting with UDP-glucose by indirect hydrogen bonds through water molecules are highlighted with a grey triangle.