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Literature summary 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

EC Number Inhibitors Comment Organism Structure
1.14.18.1 2-mercaptoethanol
-
Dioscorea bulbifera
1.14.18.1 azide
-
Dioscorea bulbifera
1.14.18.1 CN- 0.2 mM, 70% inhibition of catechol oxidation, 63% inhibition of pyrogallol oxidation, 50% inhibition of dopa oxidation Dioscorea bulbifera
1.14.18.1 dithioerythritol 0.05 mM, 82% inhibition of catechol oxidation, 95% inhibition of pyrogallol oxidation and 62% inhibition of dopa oxidation Dioscorea bulbifera
1.14.18.1 L-cysteine 0.5 mM, 61% inhibition of catechol oxidation Dioscorea bulbifera
1.14.18.1 L-phenylalanine
-
Dioscorea bulbifera
1.14.18.1 Metabisulfite
-
Dioscorea bulbifera
1.14.18.1 p-Cresol
-
Dioscorea bulbifera
1.14.18.1 Thiourea 0.5 mM, 85% inhibition of catechol oxidation Dioscorea bulbifera

KM Value [mM]

EC Number KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
1.14.18.1 4.8
-
DL-dopa
-
Dioscorea bulbifera
1.14.18.1 6.3
-
pyrogallol
-
Dioscorea bulbifera
1.14.18.1 9.1
-
catechol
-
Dioscorea bulbifera

Molecular Weight [Da]

EC Number Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
1.14.18.1 115000
-
gel filtration Dioscorea bulbifera

Organism

EC Number Organism UniProt Comment Textmining
1.14.18.1 Dioscorea bulbifera
-
-
-

Purification (Commentary)

EC Number Purification (Comment) Organism
1.14.18.1
-
Dioscorea bulbifera

Source Tissue

EC Number Source Tissue Comment Organism Textmining
1.14.18.1 tuber
-
Dioscorea bulbifera
-

Specific Activity [micromol/min/mg]

EC Number Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
1.14.18.1 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

EC Number Storage Stability Organism
1.14.18.1 -20°C, acetone powder, long term storage Dioscorea bulbifera

Substrates and Products (Substrate)

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

Temperature Optimum [°C]

EC Number Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
1.14.18.1 40
-
-
Dioscorea bulbifera

Temperature Stability [°C]

EC Number Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
1.14.18.1 50
-
inactivation above Dioscorea bulbifera

pH Optimum

EC Number pH Optimum Minimum pH Optimum Maximum Comment Organism
1.14.18.1 7
-
-
Dioscorea bulbifera