Cloned (Comment) | Organism |
---|---|
expression of wild-type and mutant enzymes in Escherichia coli strain XL1-Blue | Bacillus cereus |
Crystallization (Comment) | Organism |
---|---|
purified recombinant wild-type and mutant T47M/Y164E/T328N, hanging drop vapour diffusion method, 18°C, 0.005 ml of 15 mg/ml protein in 0.05 M sodium acetate is mixed with 0.005 ml mother liquor containing 15% PEG 6000, 5% saturated ammonium sulfate, 0.1 M phosphate, pH 6.5, crystallization of mutants Y164E and Y164F in the same way except for usage of 0.1 M sodium acetate buffer, pH 4.6, instead of phosphate buffer, X-ray diffraction structure determination and analysis at 1.72-1.95 A resolution, active site structure modelling | Bacillus cereus |
Protein Variants | Comment | Organism |
---|---|---|
additional information | engineering of the enzyme's pH optimum, conversion of the pH optimum from the bacterial type with pH 6.7 to the higher-plant type with pH 5.4, from soybean enzyme, overview | Bacillus cereus |
T47M/Y164E/T328N | site-directed mutagenesis, the mutation of Y164 leads to disruption of the hydrogen bonding around the catalytic site, the mutant enzyme shows a shifted pH optimum and a 88% decreased kcat compared to the wild-type enzyme | Bacillus cereus |
Y164E | site-directed mutagenesis, the mutation of Y164 leads to disruption of the hydrogen bonding around the catalytic site, the mutant enzyme shows a shifted pH optimum and a 59% decreased kcat compared to the wild-type enzyme | Bacillus cereus |
Y164F | site-directed mutagenesis, the mutation of Y164 leads to disruption of the hydrogen bonding around the catalytic site, the mutant enzyme shows a shifted pH optimum and a 64% decreased kcat compared to the wild-type enzyme | Bacillus cereus |
Y164H | site-directed mutagenesis, the mutation of Y164 leads to disruption of the hydrogen bonding around the catalytic site, the mutant enzyme shows a shifted pH optimum and a 97% decreased kcat compared to the wild-type enzyme | Bacillus cereus |
Y164Q | site-directed mutagenesis, the mutation of Y164 leads to disruption of the hydrogen bonding around the catalytic site, the mutant enzyme shows a shifted pH optimum and a 83% decreased kcat compared to the wild-type enzyme | Bacillus cereus |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | kinetics, recombinant wild-type andmutant enzymes | Bacillus cereus | |
0.47 | - |
amylopectin | 37°C, recombinant mutant T47M/Y164E/T328N | Bacillus cereus | |
0.73 | - |
amylopectin | 37°C, recombinant wild-type enzyme | Bacillus cereus | |
0.92 | - |
amylopectin | 37°C, recombinant mutant Y164F | Bacillus cereus | |
1.22 | - |
amylopectin | 37°C, recombinant mutant Y164Q | Bacillus cereus | |
1.24 | - |
amylopectin | 37°C, recombinant mutant Y164E | Bacillus cereus | |
2.63 | - |
amylopectin | 37°C, recombinant mutant Y164H | Bacillus cereus |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
amylopectin + H2O | Bacillus cereus | - |
maltose + ? | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Bacillus cereus | P36924 | - |
- |
Purification (Comment) | Organism |
---|---|
recombinant wild-type and mutant enzymes from Escherichia coli strain XL1-Blue | Bacillus cereus |
Reaction | Comment | Organism | Reaction ID |
---|---|---|---|
(alpha-D-glucopyranosyl-(1-4))n-alpha-D-glucopyranose + H2O = (alpha-D-glucopyranosyl-(1-4))n-2-alpha-D-glucopyranose + alpha-D-glucopyranosyl-(1-4)-beta-D-glucopyranose | Glu367 is important in catalysis, the plant enzyme shows a reaction mechanism different from the bacterial enzyme, overview | Bacillus cereus |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
amylopectin + H2O | - |
Bacillus cereus | maltose + ? | - |
? | |
amylopectin + H2O | from potato | Bacillus cereus | maltose + ? | - |
? |
Synonyms | Comment | Organism |
---|---|---|
BCB | - |
Bacillus cereus |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
37 | - |
assay at | Bacillus cereus |
Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
92 | - |
amylopectin | 37°C, recombinant mutant Y164H | Bacillus cereus | |
325 | - |
amylopectin | 37°C, recombinant mutant T47M/Y164E/T328N | Bacillus cereus | |
453 | - |
amylopectin | 37°C, recombinant mutant Y164Q | Bacillus cereus | |
988 | - |
amylopectin | 37°C, recombinant mutant Y164F | Bacillus cereus | |
1129 | - |
amylopectin | 37°C, recombinant mutant Y164E | Bacillus cereus | |
2739 | - |
amylopectin | 37°C, recombinant wild-type enzyme | Bacillus cereus |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
additional information | - |
comparison of pH-dependency/pH-profiles of recombinant wild-type and mutant enzymes | Bacillus cereus |
4.2 | - |
mutant Y164Q | Bacillus cereus |
4.6 | - |
mutant Y164E | Bacillus cereus |
4.8 | - |
mutants Y164H and Y164F | Bacillus cereus |
6 | - |
mutant T47M/Y164E/T328N | Bacillus cereus |
6.7 | - |
wild-type enzyme | Bacillus cereus |