Tryptophan-216 is essential for the transglycosylation activity of endo-beta-N-acetylglucosaminidase A.


Endo-beta-N-acetylglucosaminidase from Arthrobacter protophormiae (Endo-A) has a high level of transglycosylation activity. To determine which amino acids are involved in this activity, we employed deletion analysis, as well as random and site-directed mutagenesis. Using PCR random mutagenesis, 11 mutants with greatly decreased levels of enzyme activity… (More)


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