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Published on: March 24, 2016
Regional distant sequence homology between amylases, alpha-glucosidases and transglucanosylases
1Department of Chemistry, Carlsberg Laboratory, Copenhagen Valby, Denmark.
Abstract:
Amylases possess short, conserved regions near functional side chains. Sequence comparison extends this relationship to comprise a maltase and a cyclodextrin glucanotransferase. Similarity also exists with intestinal sucrase-isomaltase and fungal glucoamylase near identified essential carboxyl groups. Homology between COOH-terminal regions of glucoamylase and cyclodextrin glucanotranserase may indicate raw-starch binding areas. It is suggested that amylases, alpha-glucosidases, and transglucanosylases acting on 1,4- and 1,6-alpha-glucosidic linkages share key structural features in the active centres.
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