Fig. 6

Changes in intramolecular interactions of dextranase AoDex that are caused by mutants at residue S357. The structural models of the mutants were determined by SWISS-MODEL. The ribbon representation of dextranase is shown in gray. The mutant residues are labeled as navy-blue sticks. The predicted catalytic residues are labeled as orange sticks. a The relative positions of key residues of the wild-type. b–f Relative positions of key residues of AoDex mutants. g The overview of relative positions of substrate binding channels, catalytic residues, and mutant residues (take mutant V357 for example)