Glycosyltransfer in mutants of putative catalytic residue Glu303 of the human ABO(H) A and B blood group glycosyltransferases GTA and GTB proceeds through a labile active site. - Blackler RJ; Gagnon SM; Polakowski R; Rose NL; Zheng RB; Letts JA; Johal AR; Schuman B; Borisova SN; Palcic MM; Evans SV (Glycobiology, 2017)