Plant fucosyltransferase FUT11 distorts the sugar acceptor to catalyze via a transient oxocarbenium intermediate mechanism Taleb Víctor Sanz-Martínez Ignacio Serna Sonia Bort-Griñó María Narimatsu Yoshiki Furukawa Sanae Reichardt Niels C. Clausen Henrik Merino Pedro Universidad de Zaragoza Hurtado-Guerrero Ramon 2026 research-article