Activating Compound | Comment | Organism | Structure |
---|---|---|---|
cysteine | very slight activation | Klebsiella pneumoniae |
General Stability | Organism |
---|---|
Ca2+ stabilizes, enzyme is more thermostable in the presence of Ca2+ | Klebsiella pneumoniae |
substrate has protective effect on enzyme stability | Klebsiella pneumoniae |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
AgNO3 | - |
Klebsiella pneumoniae | |
Ba2+ | very slight inactivation | Klebsiella pneumoniae | |
Co2+ | very slight inactivation | Klebsiella pneumoniae | |
Cu2+ | - |
Klebsiella pneumoniae | |
Hg2+ | native enzyme, completely | Klebsiella pneumoniae | |
HgCl2 | native enzyme, completely | Klebsiella pneumoniae | |
iodoacetamide | slight inactivation | Klebsiella pneumoniae | |
Mg2+ | slight inactivation | Klebsiella pneumoniae | |
p-chloromercuribenzoate | slight inactivation | Klebsiella pneumoniae | |
Sn2+ | slight inactivation | Klebsiella pneumoniae | |
Zn2+ | - |
Klebsiella pneumoniae |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
cell bound | - |
Klebsiella pneumoniae | - |
- |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Ca2+ | native enzyme, activation | Klebsiella pneumoniae | |
Sr2+ | activation | Klebsiella pneumoniae |
Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
---|---|---|---|
54000 | - |
gel filtration | Klebsiella pneumoniae |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Klebsiella pneumoniae | - |
Aerobacter aerogenes | - |
Purification (Comment) | Organism |
---|---|
- |
Klebsiella pneumoniae |
Reaction | Comment | Organism | Reaction ID |
---|---|---|---|
(Glcalpha(1-4))m + H2O = (Glcalpha(1-4))m-6 + maltohexaose | exo-alpha amylase, products have alpha-configuration | Klebsiella pneumoniae | |
(Glcalpha(1-4))m + H2O = (Glcalpha(1-4))m-6 + maltohexaose | reaction mechanism is exo | Klebsiella pneumoniae |
Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
---|---|---|---|
8.2 | - |
cell-bound enzyme | Klebsiella pneumoniae |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
amylopectin + H2O | - |
Klebsiella pneumoniae | maltohexaose + ? | - |
? | |
amylopectin beta-amylase limit dextrin + H2O | - |
Klebsiella pneumoniae | oligosaccharide | branched oligosaccharide: B6, B7 and B8 | ? | |
amylose + H2O | short-chain amylose, DP, average degree of polymerization, = 23 | Klebsiella pneumoniae | maltohexaose | - |
? | |
amylose + H2O | reduced short-chain amylose: about 95% of the rate of short-chain amylose | Klebsiella pneumoniae | maltohexaose | - |
? | |
amylose + H2O | high molecular weight amylose: about 50% of the rate of short-chain amylose | Klebsiella pneumoniae | maltohexaose | - |
? | |
glycogen + H2O | - |
Klebsiella pneumoniae | maltohexaose | - |
? | |
glycogen beta-amylase limit dextrin + H2O | poor substrate | Klebsiella pneumoniae | oligosaccharide | branched oligosaccharide: B6, B7 and B8 | ? | |
maltohexaose + H2O | poor substrate | Klebsiella pneumoniae | maltose + maltotetraose | main product | ? | |
additional information | products have alpha-configuration | Klebsiella pneumoniae | ? | - |
? | |
additional information | alpha-cyclodextrin, beta-cyclodextrin, pullulan or maltohexaitol: not a substrate | Klebsiella pneumoniae | ? | - |
? | |
additional information | substrate and product specificity, overview | Klebsiella pneumoniae | ? | - |
? | |
additional information | exo action pattern | Klebsiella pneumoniae | ? | - |
? | |
starch + H2O | - |
Klebsiella pneumoniae | maltohexaose + ? | main product | ? | |
starch + H2O | - |
Klebsiella pneumoniae | maltohexaose + ? | more than 30% maltohexaose | ? |
Synonyms | Comment | Organism |
---|---|---|
maltohexaose producing amylase | - |
Klebsiella pneumoniae |
maltohexaose-producing exo-amylase | - |
Klebsiella pneumoniae |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
50 | - |
cell-bound enzyme | Klebsiella pneumoniae |
Temperature Minimum [°C] | Temperature Maximum [°C] | Comment | Organism |
---|---|---|---|
20 | 80 | 20°C: about 30% of maximum activity, 80°C: more than 20% of maximum activity | Klebsiella pneumoniae |
Temperature Stability Minimum [°C] | Temperature Stability Maximum [°C] | Comment | Organism |
---|---|---|---|
additional information | - |
enzyme more thermostable in the presence of Ca2+ | Klebsiella pneumoniae |
40 | - |
completely stable up to, with Ca2+ | Klebsiella pneumoniae |
50 | - |
15 min at 50°C: 80% of activity retained, with Ca2+ | Klebsiella pneumoniae |
60 | - |
all activity lost after 15 min | Klebsiella pneumoniae |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
6.8 | - |
cell-bound enzyme | Klebsiella pneumoniae |
pH Minimum | pH Maximum | Comment | Organism |
---|---|---|---|
3 | 9 | pH 3.0: 20% of maximum activity, pH 9.0: more than 60% of maximum activity | Klebsiella pneumoniae |
5.5 | 8 | more than 80% of maximum activity at 5.5 and 8.0 | Klebsiella pneumoniae |
pH Stability | pH Stability Maximum | Comment | Organism |
---|---|---|---|
3 | - |
70% loss of activity | Klebsiella pneumoniae |
6 | 9 | cell-bound enzyme: 20% loss of activity, 60 min, 40°C | Klebsiella pneumoniae |
10 | - |
50% loss of activity | Klebsiella pneumoniae |