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Based on conserved sites and homology modeling analysis, the residue Phe581 in the Klebsiella variicola SHN-1 pullulanase was selected as the potential thermostability-related site and its role on thermostability and activity was investigated by site-saturated mutagenesis. Compared with the wild-type pullulanase, the optimum temperature of the mutants including F581L, F581Q, F581R,...
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