Inhibitors | Comment | Organism | Structure |
---|---|---|---|
CN- | 0.2 mM, 50% inhibition of isoenzyme I, 0.13 mM, 50% inhibition of isoenzyme III | Metroxylon sagu | |
diethyldithiocarbamate | 0.5 mM, 50% inhibition of isoenzyme I, 0.19 mM, 50% inhibition of isoenzyme III | Metroxylon sagu | |
EDTA | no inhibition EDTA | Metroxylon sagu | |
Sodium sulfate | - |
Metroxylon sagu |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
3 | - |
D-catechin | isoenzyme III | Metroxylon sagu | |
3.03 | - |
DL-epicatechin | isoenzyme I | Metroxylon sagu | |
3.22 | - |
D-epicatechin | isoenzyme III | Metroxylon sagu | |
3.85 | - |
L-epicatechin | isoenzyme I | Metroxylon sagu | |
5 | - |
D-catechin | isoenzyme I | Metroxylon sagu | |
5.26 | - |
DL-epicatechin | isoenzyme III | Metroxylon sagu | |
6.67 | - |
D-epicatechin | isoenzyme I | Metroxylon sagu | |
11.1 | - |
L-epicatechin | isoenzyme III | Metroxylon sagu |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Co2+ | 0.9 mM, slight activation of isoenzymes I and III | Metroxylon sagu | |
copper | 0.1 mM, approx. 3fold activation of isoenzymes I and III | Metroxylon sagu | |
Mn2+ | slight activation of isoenzymes I and III | Metroxylon sagu | |
Ni2+ | 0.9 mM, slight activation of isoenzymes I and III | Metroxylon sagu | |
Zn2+ | 0.9 mM, approx. 2fold activation of isoenzymes I and III | Metroxylon sagu |
Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
---|---|---|---|
40000 | - |
isoenzymes I and III, gel filtration | Metroxylon sagu |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Metroxylon sagu | - |
sago palm, isoenzymes I and III | - |
Purification (Comment) | Organism |
---|---|
isoenzyme I, hydroxylapatite, DEAE-Cellulose, Sephadex G-100, isoenzyme III, hydroxylapatite, Sephadex G-100 | Metroxylon sagu |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
pith | - |
Metroxylon sagu | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
4-methylcatechol + O2 | - |
Metroxylon sagu | 4-methyl-o-benzoquinone + H2O | - |
? | |
catechol + 1/2 O2 | - |
Metroxylon sagu | 1,2-benzoquinone + H2O | - |
? | |
chlorogenic acid + O2 | - |
Metroxylon sagu | chlorogenoquinone + H2O | - |
? | |
D-catechin + O2 | - |
Metroxylon sagu | ? | - |
? | |
DL-epicatechin + O2 | - |
Metroxylon sagu | ? | - |
? | |
epicatechin + O2 | - |
Metroxylon sagu | ? | - |
? | |
L-epicatechin + O2 | - |
Metroxylon sagu | ? | - |
? | |
L-tyrosine + O2 + AH2 | no activity with tyrosine | Metroxylon sagu | L-dopa + H2O + A | - |
? |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
35 | - |
isoenzyme I | Metroxylon sagu |
45 | - |
isoenzyme III | Metroxylon sagu |
Temperature Minimum [°C] | Temperature Maximum [°C] | Comment | Organism |
---|---|---|---|
25 | 65 | 25°C: about 50% of maximal activity, 65°C: about 45% of maximal activity, polyphenol oxidase I and II | Metroxylon sagu |
Temperature Stability Minimum [°C] | Temperature Stability Maximum [°C] | Comment | Organism |
---|---|---|---|
40 | - |
inactivation of isozyme PPO I | Metroxylon sagu |
50 | - |
gradual inactivation of isozyme PPO III | Metroxylon sagu |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
6.5 | - |
isoenzymes I and III | Metroxylon sagu |
pH Minimum | pH Maximum | Comment | Organism |
---|---|---|---|
4.5 | 8 | pH 4.5: about 70% of maximal activity, pH 8.0: about 50% of maximal activity, negligible activity below pH 4 and above pH 9, isoenzyme PPO I | Metroxylon sagu |
5 | 8 | pH 5.0: about 30% of maximal activity, pH 8.0: about 50% of maximal activity, negligible activity below pH 4 and above pH 9, isoenzyme PPO II | Metroxylon sagu |
pH Stability | pH Stability Maximum | Comment | Organism |
---|---|---|---|
3 | 8 | isozyme PPO III, 90% activity after 18 h at pH 3.0 | Metroxylon sagu |
5 | 10 | isozyme PPO I, 90% activity after 18 h at pH 10.0 | Metroxylon sagu |