1.14.99.53 W82Y/N85F mutation changes the C1:C4 oxidation ratio from 0.9 (for the wild-type) to 10.9 745380 1.14.99.53 W82Y/N85F/Q141W loss of chitin monooxygenase activity, 12.21% residual cellulose C1- and 2.1% residual C4-oxidizing activity, ratio C1:C4-activity is 5.06 745380 1.14.99.53 W82Y/N85F/Q141W mutation changes the C1:C4 oxidation ratio from 0.9 (for the wild-type) to 5.1 745380 1.14.99.53 W82Y/N85F/Y116F mutation changes the C1:C4 oxidation ratio from 0.9 (for the wild-type) to 14.7 745380 1.14.99.53 W82Y/N85F/Y116F/Q141W loss of chitin oxidizinbg activity, 10.2% residual cellulose C1- and 1.6% residual C4-oxidizing activity, ratio C1:C4-activity is 5.78 745380 1.14.99.53 W82Y/N85F/Y116F/Q141W mutation changes the C1:C4 oxidation ratio from 0.9 (for the wild-type) to 5.8 745380 1.14.99.53 W88Y/N91F mutation leads to loss of C4 oxidation, i.e to the activity of EC 1.14.99.54 -, 745380 1.14.99.53 Y116F no changes in the C1:C4 oxidation ratio -, 745380 1.14.99.53 Y142A distance between the copper ion and the predicted active site residue are increased -, 766407 1.14.99.53 Y54A mutation of residue at subsite -4, minimal effect on degradation of beta-chitin, about 20% residual activity with substrate [(1->4)-N-acetyl-beta-D-glucosaminyl]6 744375