['To modify two main N-glycosylation residues of cellobiohydrolase I from Trichoderma reesei by site-directed mutagenesis for decreasing the extent of glycosylation and exploring possible effects on its properties.', 'Asparagine 45 and 64 residues were mutated to alanine to make single/double mutants and expressed in P. pastoris. Decreasing N-glycosylation of the recombinant CBH I resulted in an increased affinity of the enzyme for carboxymethylcellulose and also improved the Kcat/Km while the specific activity was decreased. Also, the enzymes were stable up to 80\xa0°C. There was no significant change of the optimum pH and temperature by decrease of glycosylation in the mutated enzymes in comparison to the wild-type at constant incubation time of assay.'] Are substrate affinity and catalytic efficiency improved by decreasing glycosylation sites in Trichoderma reesei cellobiohydrolase I expressed in Pichia pastoris?