1: αXylF; pNP β-D-xylopyranoside With Bhxglycosynthase E334G mutant T=20°C; pH=7; 24 h; aq. phosphate bufferEnzymatic reaction; 2: acetic anhydride With pyridine; 4-(N,N-dimethlyamino)pyridine T=20°C; 16 h;