Cloned (Comment) | Organism |
---|---|
dexB, sequence comparisons | Streptococcus mutans |
dexB, sequence comparisons, expression of wild-type and mutant enzymes in Escherichia coli strain BL21(DE3) CodonPlus RIL | Streptococcus mutans |
Protein Variants | Comment | Organism |
---|---|---|
C129S/C532S | site-directed mutagenesis, the mutant shows unaltered activity compared to the wild-type enzyme, the mutant predominantly catalyzes hydrolysis | Streptococcus mutans |
D194A/C129S/C532S | site-directed mutagenesis | Streptococcus mutans |
D194C/C129S/C532S | site-directed mutagenesis, the mutant shows highly reduced activity compared with the wild-type enzyme and mutant C129S/C532S, oxidation with KI activates the mutant by 330fold which is 0.27% activity of the activity of mutant C129S/C532S, the oxidized mutant Ox-D194C-2CS catalyzes both hydrolysis and transglucosylation | Streptococcus mutans |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | detailed steady-state kinetics of wild-type and mutant enzymes, overview | Streptococcus mutans |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
additional information | Streptococcus mutans | dextran glucosidase from Streptococcus mutans catalyzes the hydrolysis of an alpha-1,6-glucosidic linkage at the nonreducing end of isomaltooligosaccharides and dextran | ? | - |
? | |
additional information | Streptococcus mutans ATCC 700610 | dextran glucosidase from Streptococcus mutans catalyzes the hydrolysis of an alpha-1,6-glucosidic linkage at the nonreducing end of isomaltooligosaccharides and dextran | ? | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Streptococcus mutans | Q2HWU5 | gene dexB; gene dexB | - |
Streptococcus mutans | Q99040 | gene dexB; gene dexB | - |
Streptococcus mutans | Q99040 | gene dexB; serotype C, gene dexB | - |
Streptococcus mutans ATCC 700610 | Q99040 | gene dexB; serotype C, gene dexB | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
4-nitrophenyl-alpha-D-glucopyranoside + H2O | - |
Streptococcus mutans | 4-nitrophenol + D-glucose | - |
? | |
4-nitrophenyl-alpha-D-glucopyranoside + H2O | - |
Streptococcus mutans ATCC 700610 | 4-nitrophenol + D-glucose | - |
? | |
4-nitrophenyl-alpha-isomaltoside + H2O | - |
Streptococcus mutans | 4-nitrophenol + isomaltose | - |
? | |
4-nitrophenyl-alpha-isomaltoside + H2O | - |
Streptococcus mutans ATCC 700610 | 4-nitrophenol + isomaltose | - |
? | |
additional information | dextran glucosidase from Streptococcus mutans catalyzes the hydrolysis of an alpha-1,6-glucosidic linkage at the nonreducing end of isomaltooligosaccharides and dextran | Streptococcus mutans | ? | - |
? | |
additional information | the enzyme also performs transglucosylation | Streptococcus mutans | ? | - |
? | |
additional information | dextran glucosidase from Streptococcus mutans catalyzes the hydrolysis of an alpha-1,6-glucosidic linkage at the nonreducing end of isomaltooligosaccharides and dextran | Streptococcus mutans ATCC 700610 | ? | - |
? | |
additional information | the enzyme also performs transglucosylation | Streptococcus mutans ATCC 700610 | ? | - |
? |
Synonyms | Comment | Organism |
---|---|---|
dextran glucosidase | - |
Streptococcus mutans |
SMDG | - |
Streptococcus mutans |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
37 | - |
assay at | Streptococcus mutans |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
6 | - |
assay at | Streptococcus mutans |
General Information | Comment | Organism |
---|---|---|
evolution | the enzyme belongs to the glycosyl hydrolase family 13 | Streptococcus mutans |
evolution | the enzyme belongs to the glycosyl hydrolase family 13, GH13 | Streptococcus mutans |
additional information | the enzyme has an Asp194 catalytic nucleophile and two catalytically unrelated Cys residues, Cys129 and Cys532 | Streptococcus mutans |
additional information | the enzyme has an Asp194 catalytic nucleophile and two catalytically unrelated Cys residues, Cys129 and Cys532. Asp194 is essential for enzyme activity | Streptococcus mutans |