Changing the substrate specificity of a chitooligosaccharide oxidase from<i>Fusarium graminearum</i>by model-inspired site-directed mutagenesis
作者:Dominic P.H.M. Heuts、Dick B. Janssen、Marco W. Fraaije
DOI:10.1016/j.febslet.2007.09.019
日期:2007.10.16
Chitooligosaccharide oxidase (ChitO) catalyzes the oxidation of C1 hydroxyl moieties on chitooligosaccharides and in this way displays a different substrate preference as compared to other known oligosaccharide oxidases. ChitO was identified in the genome of Fusarium graminearum and a structural model revealed that one active site residue (Q268) was likely to be involved in the recognition of the N‐acetyl moiety on the chitooligosaccharide substrates. The substrate specificity of wild type ChitO and the Q268R mutant were examined and confirmed that Q268 is indeed involved in N‐acetyl recognition.