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Information on EC 3.2.1.196 - limit dextrin alpha-1,6-maltotetraose-hydrolase

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IUBMB Comments
This bacterial enzyme catalyses a reaction similar to EC 3.2.1.33, amylo-alpha-1,6-glucosidase (one of the activities of the eukaryotic glycogen debranching enzyme). However, while EC 3.2.1.33 removes single glucose residues linked by 1,6-alpha-linkage, and thus requires the additional activity of 4-alpha-glucanotransferase (EC 2.4.1.25) to act on limit dextrins formed by glycogen phosphorylase (EC 2.4.1.1), this enzyme removes maltotriose and maltotetraose chains that are attached by 1,6-alpha-linkage to the limit dextrin main chain, generating a debranched limit dextrin without a need for another enzyme.
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
Reaction Schemes
Hydrolysis of (1->6)-alpha-D-glucosidic linkages to branches with degrees of polymerization of three or four glucose residues in limit dextrin.
Synonyms
GDE, GlgX, GlgX protein, glycogen debranching enzyme, isoamylase-type debranching enzyme, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
Hydrolysis of (1->6)-alpha-D-glucosidic linkages to branches with degrees of polymerization of three or four glucose residues in limit dextrin.
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PATHWAY SOURCE
PATHWAYS
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