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Abstract

It is intended to provide a novel method for improving an enzyme hydrolyzing an a-1,6-glycosidic linkage. A mutated enzyme is designed by specifying one or more amino acids selected from the group shown below in an amino acid sequence of an enzyme (an enzyme to be mutated) that hydrolyzes an a-1,6-glycosidic linkage, that is, the group consisting of an amino acid corresponding to an amino acid at the 292 position, an amino acid corresponding to an amino acid at the 371 position, an amino acid corresponding to an amino acid at the 406 position, an amino acid corresponding to an amino acid at the 407 position, an amino acid corresponding to an amino acid at the 437 position, an amino acid corresponding to an amino acid at the 465 position, an amino acid corresponding to an amino acid at the 475 position, an amino acid corresponding to an amino acid at the 476 position; an amino acid corresponding to an amino acid at the 525 position, an amino acid corresponding to an amino acid at the 526 position, an amino acid corresponding to an amino acid at the 580 position and an amino acid corresponding to an amino acid at the 582 position of the amino acid represented by in SEQ ID NO: 2 (step (1)) and constructing an amino acid sequence in which the amino acid(s) specified in the step (1) is/are substituted with another amino acid or deleted based on the amino acid sequence of the enzyme to be mutated (step (2)).

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First Claim