Any feedback?
Please rate this page
(literature.php)
(0/150)

BRENDA support

Literature summary for 1.14.18.1 extracted from

  • Anosike, E.O.; Ayaebene, A.O.
    Purification and some properties of polyphenol oxidase from the yam tubers, Dioscorea bulbifera (1981), Phytochemistry, 20, 2625-2628.
No PubMed abstract available

Inhibitors

Inhibitors Comment Organism Structure
2-mercaptoethanol
-
Dioscorea bulbifera
azide
-
Dioscorea bulbifera
CN- 0.2 mM, 70% inhibition of catechol oxidation, 63% inhibition of pyrogallol oxidation, 50% inhibition of dopa oxidation Dioscorea bulbifera
dithioerythritol 0.05 mM, 82% inhibition of catechol oxidation, 95% inhibition of pyrogallol oxidation and 62% inhibition of dopa oxidation Dioscorea bulbifera
L-cysteine 0.5 mM, 61% inhibition of catechol oxidation Dioscorea bulbifera
L-phenylalanine
-
Dioscorea bulbifera
Metabisulfite
-
Dioscorea bulbifera
p-Cresol
-
Dioscorea bulbifera
Thiourea 0.5 mM, 85% inhibition of catechol oxidation Dioscorea bulbifera

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
4.8
-
DL-dopa
-
Dioscorea bulbifera
6.3
-
pyrogallol
-
Dioscorea bulbifera
9.1
-
catechol
-
Dioscorea bulbifera

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
115000
-
gel filtration Dioscorea bulbifera

Organism

Organism UniProt Comment Textmining
Dioscorea bulbifera
-
-
-

Purification (Commentary)

Purification (Comment) Organism
-
Dioscorea bulbifera

Source Tissue

Source Tissue Comment Organism Textmining
tuber
-
Dioscorea bulbifera
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
additional information
-
0.0088 units, 1 unit is defined as the amount of enzyme that causes a change in absorbance of 0.001/min Dioscorea bulbifera

Storage Stability

Storage Stability Organism
-20°C, acetone powder, long term storage Dioscorea bulbifera

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
catechol + 1/2 O2
-
Dioscorea bulbifera 1,2-benzoquinone + H2O
-
?
DL-DOPA + O2
-
Dioscorea bulbifera dopaquinone + H2O
-
r
dopa + 1/2 O2
-
Dioscorea bulbifera dopaquinone + H2O
-
?
L-tyrosine + O2 + AH2 no activity with tyrosine Dioscorea bulbifera L-dopa + H2O + A
-
?
p-cresol + O2 no activity Dioscorea bulbifera 4-methylpyrocatechol + H2O
-
?
pyrogallol + O2
-
Dioscorea bulbifera ?
-
?

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
40
-
-
Dioscorea bulbifera

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
50
-
inactivation above Dioscorea bulbifera

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7
-
-
Dioscorea bulbifera