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IPT domain (domain D) of cyclodextrin glycosyltransferase (CGTase) and similar enzymes. These enzymes are involved in the enzymatic hydrolysis of alpha-1,4 linkages of starch polymers and belong to the glycosyl hydrolase family 13. Most consist of three domains (A,B,C) but CGTase is more complex and has two additional domains (D,E). The function of the IPT/D domain is unknown.
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