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EC 3.2.1.196 Details
EC number
3.2.1.196
Accepted name
limit dextrin α-1,6-maltotetraose-hydrolase
Reaction
Hydrolysis of (1→6)-α-D-glucosidic linkages to branches with degrees of polymerization of three or four glucose residues in limit dextrin.
Other name(s)
glgX (gene name), glycogen debranching enzyme (ambiguous)
Systematic name
glycogen phosphorylase-limit dextrin maltotetraose-hydrolase
Comment
This bacterial enzyme catalyses a reaction similar to EC 3.2.1.33, amylo-α-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-α-linkage, and thus requires the additional activity of 4-α-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-α-linkage to the limit dextrin main chain, generating a debranched limit dextrin without a need for another enzyme.
History
created 2016
EC Tree
1.3.3.2 created 1972, deleted 2005