Gomez, H.; Polyak, I.; Thiel, W.; Lluch, J. M.; Masgrau, L. Retaining Glycosyltransferase Mechanism Studied by QM/MM Methods: Lipopolysaccharyl-α-1,4-Galactosyltransferase C Transfers α-Galactose Via an Oxocarbenium Ion-Like Transition State. Journal of the American Chemical Society 2012, 134, 4743–4752.