Application | Comment | Organism |
---|---|---|
synthesis | CGTase is an important industrial enzyme, unique in its capacity to convert starch and related substrates into cyclodextrins through cyclization, an intramolecular transglycosylation reaction | Lysinibacillus sphaericus |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
beta-cyclodextrin | strong product inhibition of CGTase | Lysinibacillus sphaericus |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | Michaelis-Menten kinetics, overview | Lysinibacillus sphaericus | |
0.8 | - |
maltodextrin | pH 6.0, 65°C | Lysinibacillus sphaericus |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
extracellular | - |
Lysinibacillus sphaericus | - |
- |
Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
---|---|---|---|
59000 | - |
x * 59000, SDS-PAGE | Lysinibacillus sphaericus |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Lysinibacillus sphaericus | - |
alkalophilic strain 41, isolated from soybean-soil culture | - |
Purification (Comment) | Organism |
---|---|
native enzyme 315fold by ammonium sulfate fractionation, beta-cyclodextrin affinity chromatography, and ultrafiltration | Lysinibacillus sphaericus |
Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
---|---|---|---|
23.5 | - |
coupling activity, purified enzyme | Lysinibacillus sphaericus |
75.8 | - |
cyclization activity, purified enzyme | Lysinibacillus sphaericus |
198.6 | - |
disproportionation activity, purified enzyme | Lysinibacillus sphaericus |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
methanol + maltodextrin | - |
Lysinibacillus sphaericus | alpha-methyl-D-glucopyranoside + beta-cyclodextrin | - |
? | |
additional information | in addition to the intramolecular transglycosylation and cyclization producing beta-cyclodextrins, using maltodextrin and starch as substrates, the CGTase shows disproportionation and coupling activities, intermolecular transglycosylation reactions. The enzyme produces alpha-, beta-, and gamma-cyclodextrins in the ratio of 0.40:1:0.45. Activity with different starch types, overview | Lysinibacillus sphaericus | ? | - |
? |
Subunits | Comment | Organism |
---|---|---|
? | x * 59000, SDS-PAGE | Lysinibacillus sphaericus |
Synonyms | Comment | Organism |
---|---|---|
CGTase | - |
Lysinibacillus sphaericus |
cyclodextrin glycosyltransferase | - |
Lysinibacillus sphaericus |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
65 | - |
cyclization activity | Lysinibacillus sphaericus |
Temperature Minimum [°C] | Temperature Maximum [°C] | Comment | Organism |
---|---|---|---|
35 | 80 | activity range, about 35% of maximal activity at 35°C and 80°C | Lysinibacillus sphaericus |
Temperature Stability Minimum [°C] | Temperature Stability Maximum [°C] | Comment | Organism |
---|---|---|---|
35 | 65 | purified native enzyme, 80% remaining activity at 35-65°C, pH 8.0, after 4 h, thermal deactivation above 70°C | Lysinibacillus sphaericus |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
6 | - |
cyclization activity | Lysinibacillus sphaericus |
pH Minimum | pH Maximum | Comment | Organism |
---|---|---|---|
4.5 | 10 | activity range, about 20% of maximal activity at pH 4.5, and 40% at pH 10.0 | Lysinibacillus sphaericus |
pH Stability | pH Stability Maximum | Comment | Organism |
---|---|---|---|
5 | - |
purified native enzyme, 50°C, 4 h, 34.2% retaining activity | Lysinibacillus sphaericus |
6 | 7 | purified native enzyme, 50°C, 4 h, almost completely stable | Lysinibacillus sphaericus |
8 | 10 | purified native enzyme, 50°C, 4 h, 16.8% retaining activity | Lysinibacillus sphaericus |