3.2.1.196: limit dextrin alpha-1,6-maltotetraose-hydrolase

This is an abbreviated version!
For detailed information about limit dextrin alpha-1,6-maltotetraose-hydrolase, go to the full flat file.

Reaction

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

ECTree

3 Hydrolases

3.2 Glycosylases

3.2.1 Glycosidases, i.e. enzymes that hydrolyse O- and S-glycosyl compounds

3.2.1.196 limit dextrin alpha-1,6-maltotetraose-hydrolase

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Results	in table
1736	AA Sequence
4	Cloned(Commentary)
3	Crystallization (Commentary)
2	Expression
8	General Information
7	KM Value [mM]
5	Molecular Weight [Da]
3	Natural Substrates/ Products (Substrates)
73	Organism
1	Pathway
1	pH Optimum
1	pH Stability
4	Purification (Commentary)
1	Reaction
11	Reference
23	Substrates and Products (Substrate)
7	Subunits
20	Synonyms
1	Systematic Name
3	Temperature Stability [°C]
4	Turnover Number [1/s]

Systematic Name

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

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glycogen phosphorylase-limit dextrin maltotetraose-hydrolase

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.