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Literature summary for 3.5.1.105 extracted from
- The ChbG gene of the chitobiose (chb) operon of Escherichia coli encodes a chitooligosaccharide deacetylase (2012), J. Bacteriol., 194, 4959-4971.
Cloned(Commentary)
| Cloned (Comment) | Organism |
|---|---|
| gene chbG or ydjC, encoded in the chb operon, DNA and amino acid sequence determination and analysis | Escherichia coli |
Protein Variants
| Protein Variants | Comment | Organism |
|---|---|---|
| F146L | site-directed mutagenesis | Escherichia coli |
| K184E | site-directed mutagenesis | Escherichia coli |
| additional information | growth of different mutant strains on various beta-glucosides as the sole carbon source. Effect of chbG deletion on transcriptional activation of the chb promoter in Cel+ mutants carrying a deletion of nagC and different activating mutations in chbR, overview. The Vibrio cholerae homologue of chbG can rescue the effect of the Escherichia coli chbG mutation | Escherichia coli |
| N137K/K184E | site-directed mutagenesis | Escherichia coli |
| N238S | site-directed mutagenesis | Escherichia coli |
| S134P | site-directed mutagenesis | Escherichia coli |
Natural Substrates/ Products (Substrates)
| Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| GlcNAc-beta-(1,4)-GlcNAc + H2O | Escherichia coli | - |
GlcNAc-beta-(1,4)-GlcN + acetate | - |
? |  |
| GlcNAc-beta-(1,4)-GlcNAc + H2O | Escherichia coli BW25113 | - |
GlcNAc-beta-(1,4)-GlcN + acetate | - |
? | |
| GlcNAc-beta-1,4-GlcNAc-beta-1,4-GlcNAc + H2O | Escherichia coli | - |
GlcNAc-beta-1,4-GlcNAc-beta-1,4-GlcN + acetate | - |
? | |
| GlcNAc-beta-1,4-GlcNAc-beta-1,4-GlcNAc + H2O | Escherichia coli BW25113 | - |
GlcNAc-beta-1,4-GlcNAc-beta-1,4-GlcN + acetate | - |
? | |
Organism
| Organism | UniProt | Comment | Textmining |
|---|---|---|---|
| Escherichia coli | P37794 | gene chbG or ydjC; gene chbG or ydjC, encoded in the chb operon | - |
| Escherichia coli BW25113 | P37794 | gene chbG or ydjC; gene chbG or ydjC, encoded in the chb operon | - |
Substrates and Products (Substrate)
| Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| GlcNAc-beta-(1,4)-GlcNAc + H2O | - |
Escherichia coli | GlcNAc-beta-(1,4)-GlcN + acetate | - |
? | |
| GlcNAc-beta-(1,4)-GlcNAc + H2O | - |
Escherichia coli BW25113 | GlcNAc-beta-(1,4)-GlcN + acetate | - |
? | |
| GlcNAc-beta-1,4-GlcNAc-beta-1,4-GlcNAc + H2O | - |
Escherichia coli | GlcNAc-beta-1,4-GlcNAc-beta-1,4-GlcN + acetate | - |
? | |
| GlcNAc-beta-1,4-GlcNAc-beta-1,4-GlcNAc + H2O | - |
Escherichia coli BW25113 | GlcNAc-beta-1,4-GlcNAc-beta-1,4-GlcN + acetate | - |
? | |
Synonyms
| Synonyms | Comment | Organism |
|---|---|---|
| ChbG | - |
Escherichia coli |
| chitooligosaccharide deacetylase | - |
Escherichia coli |
Temperature Optimum [°C]
| Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|
| 37 | - |
assay at | Escherichia coli |
pH Optimum
| pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|
| 7 | - |
assay at | Escherichia coli |
General Information
| General Information | Comment | Organism |
|---|---|---|
| evolution | the enzyme is an evolutionarily conserved protein that belongs to the the YdjC family of proteins | Escherichia coli |
| metabolism | deacetylated chitobiose and chitotriose provide the induction signal necessary for the activation of the ChbR regulator | Escherichia coli |
| additional information | three conserved residues Asp11, His61, and His125 form the catalytic triad | Escherichia coli |
| physiological function | the monodeacetylase that is essential for growth on the acetylated chitooligosaccharides chitobiose and chitotriose but is dispensable for growth on cellobiose and chitosan dimer, the deacetylated form of chitobiose. Activation of the chb promoter by the regulatory protein ChbR is dependent on ChbG, deacetylation of chitobiose-6-phosphate and chitotriose-6-phosphate is necessary for their recognition by ChbR as inducers. ChbR-independent expression of the permease and phospho-beta-glucosidase from a heterologous promoter did not support growth on both chitobiose and chitotriose in the absence of chbG, suggesting an additional role of chbG in the hydrolysis of chitooligosaccharides | Escherichia coli |
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