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Literature summary for 1.14.18.1 extracted from

  • Okamoto, A.; Imagawa, H.; Arai, Y.; Ozawa, T.
    Partial purification and some properties of polyphenoloxidases from sago palm (1988), Agric. Biol. Chem., 52, 2215-2222.
No PubMed abstract available

Inhibitors

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 [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

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 [Da] Molecular Weight Maximum [Da] Comment Organism
40000
-
isoenzymes I and III, gel filtration Metroxylon sagu

Organism

Organism UniProt Comment Textmining
Metroxylon sagu
-
sago palm, isoenzymes I and III
-

Purification (Commentary)

Purification (Comment) Organism
isoenzyme I, hydroxylapatite, DEAE-Cellulose, Sephadex G-100, isoenzyme III, hydroxylapatite, Sephadex G-100 Metroxylon sagu

Source Tissue

Source Tissue Comment Organism Textmining
pith
-
Metroxylon sagu
-

Substrates and Products (Substrate)

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 [°C] Temperature Optimum Maximum [°C] Comment Organism
35
-
isoenzyme I Metroxylon sagu
45
-
isoenzyme III Metroxylon sagu

Temperature Range [°C]

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 [°C]

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

pH Optimum Minimum pH Optimum Maximum Comment Organism
6.5
-
isoenzymes I and III Metroxylon sagu

pH Range

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 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