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Literature summary extracted from
- Substrate recognition mechanism of alpha-1,6-glucosidic linkage hydrolyzing enzyme, dextran glucosidase from Streptococcus mutans (2008), J. Mol. Biol., 378, 913-922.
Cloned(Commentary)
| EC Number | Cloned (Comment) | Organism |
|---|---|---|
| 3.2.1.70 | wild-type and mutant expressed in Escherichia coli BL21 (DE3) CodonPlus RIL containing the expression plasmid derived from pET23d | Streptococcus mutans |
Crystallization (Commentary)
| EC Number | Crystallization (Comment) | Organism |
|---|---|---|
| 3.2.1.70 | crystal structures of DGase in uncomplexed form and a mutant in complex with isomaltotriose, to 2.2 A resolution, by the hanging-drop, vapor-diffusion method at 20°C. The enzyme is composed of three domains, A, B and C, and has a (beta/alpha)8-barrel in domain A. Three catalytic residues are located at the bottom of the active site pocket and the bound isomaltotriose occupies subsites -1 to +2. Hydrogen bonds between Asp60 and Arg398 and O4 atom of the glucose unit at subsite -1 accomplish recognition of the non-reducing end of the bound substrate. The side-chain atoms of Glu371 and Lys275 form hydrogen bonds with the O2 and O3 atoms of the glucose residue at subsite +1 | Streptococcus mutans |
Protein Variants
| EC Number | Protein Variants | Comment | Organism |
|---|---|---|---|
| 3.2.1.70 | E236Q | catalysis is compromised in complex with isomaltotriose | Streptococcus mutans |
Metals/Ions
| EC Number | Metals/Ions | Comment | Organism | Structure |
|---|---|---|---|---|
| 3.2.1.70 | Ca2+ | - |
Streptococcus mutans |  |
Molecular Weight [Da]
| EC Number | Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
|---|---|---|---|---|
| 3.2.1.70 | 62000 | - |
- |
Streptococcus mutans |
Organism
| EC Number | Organism | UniProt | Comment | Textmining |
|---|---|---|---|---|
| 3.2.1.70 | Streptococcus mutans | Q99040 | - |
- |
Purification (Commentary)
| EC Number | Purification (Comment) | Organism |
|---|---|---|
| 3.2.1.70 | by Ni-chelating column chromatography | Streptococcus mutans |
Substrates and Products (Substrate)
| EC Number | Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 3.2.1.70 | isomaltotriose + H2O | - |
Streptococcus mutans | D-glucose | - |
? | |
Synonyms
| EC Number | Synonyms | Comment | Organism |
|---|---|---|---|
| 3.2.1.70 | dextran glucosidase | - |
Streptococcus mutans |
| 3.2.1.70 | DGase | - |
Streptococcus mutans |
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Release 2023.1 (January 2023)
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