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Literature summary extracted from

  • Ikediobi, C.O.; Obasuyi, H.N.
    Purification and some properties of o-diphenolase from white yam tubers (1982), Phytochemistry, 21, 2815-2820.
No PubMed abstract available

Inhibitors

EC Number Inhibitors Comment Organism Structure
1.14.18.1 2-mercaptoethanol 1 mM, complete inhibition Dioscorea cayenensis subsp. rotundata
1.14.18.1 CN- 1 mM, 96% inhibition Dioscorea cayenensis subsp. rotundata
1.14.18.1 diethyldithiocarbamate 1 mM, complete inhibition Dioscorea cayenensis subsp. rotundata
1.14.18.1 DL-dithiothreitol 1 mM, complete inhibition Dioscorea cayenensis subsp. rotundata
1.14.18.1 iodobenzoic acid 1 mM, 78% inhibition Dioscorea cayenensis subsp. rotundata
1.14.18.1 L-ascorbic acid 1 mM, complete inhibition of purified enzyme, 20% inhibition of crude enzyme Dioscorea cayenensis subsp. rotundata
1.14.18.1 L-cysteine 1 mM, complete inhibition Dioscorea cayenensis subsp. rotundata
1.14.18.1 Metabisulfite 1 mM, complete inhibition Dioscorea cayenensis subsp. rotundata
1.14.18.1 N3-
-
Dioscorea cayenensis subsp. rotundata

KM Value [mM]

EC Number KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
1.14.18.1 13
-
catechol
-
Dioscorea cayenensis subsp. rotundata

Metals/Ions

EC Number Metals/Ions Comment Organism Structure
1.14.18.1 copper 4 gatom per mol Dioscorea cayenensis subsp. rotundata
1.14.18.1 copper 0.22% copper, probably 4 copper atoms per enzyme molecule Dioscorea cayenensis subsp. rotundata

Molecular Weight [Da]

EC Number Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
1.14.18.1 107000
-
gel filtration Dioscorea cayenensis subsp. rotundata

Organism

EC Number Organism UniProt Comment Textmining
1.14.18.1 Dioscorea cayenensis subsp. rotundata
-
white yam from Nigeria
-

Purification (Commentary)

EC Number Purification (Comment) Organism
1.14.18.1 ammonium sulfate, DEAE-Sephadex, Sephadex G-20, DEAE-Sephadex Dioscorea cayenensis subsp. rotundata

Source Tissue

EC Number Source Tissue Comment Organism Textmining
1.14.18.1 tuber
-
Dioscorea cayenensis subsp. rotundata
-

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
-
9900 units, 1 unit is defined as the amount of enzyme that causes a change in absorbance of 0.001/min Dioscorea cayenensis subsp. rotundata

Storage Stability

EC Number Storage Stability Organism
1.14.18.1 4°C, 2 weeks, 10% loss of activity Dioscorea cayenensis subsp. rotundata

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
1.14.18.1 catechol + 1/2 O2
-
Dioscorea cayenensis subsp. rotundata 1,2-benzoquinone + H2O
-
?
1.14.18.1 chlorogenic acid + O2
-
Dioscorea cayenensis subsp. rotundata chlorogenoquinone + H2O
-
?
1.14.18.1 dopa + 1/2 O2
-
Dioscorea cayenensis subsp. rotundata dopaquinone + H2O
-
?
1.14.18.1 pyrogallol + O2
-
Dioscorea cayenensis subsp. rotundata ?
-
?

Temperature Optimum [°C]

EC Number Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
1.14.18.1 25
-
-
Dioscorea cayenensis subsp. rotundata

Temperature Stability [°C]

EC Number Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
1.14.18.1 60
-
5 min, stable Dioscorea cayenensis subsp. rotundata

pH Optimum

EC Number pH Optimum Minimum pH Optimum Maximum Comment Organism
1.14.18.1 6.8
-
-
Dioscorea cayenensis subsp. rotundata

Ki Value [mM]

EC Number Ki Value [mM] Ki Value maximum [mM] Inhibitor Comment Organism Structure
1.14.18.1 0.1
-
L-cysteine
-
Dioscorea cayenensis subsp. rotundata
1.14.18.1 0.2
-
CN-
-
Dioscorea cayenensis subsp. rotundata
1.14.18.1 0.5
-
2-mercaptoethanol
-
Dioscorea cayenensis subsp. rotundata
1.14.18.1 1.8
-
N3-
-
Dioscorea cayenensis subsp. rotundata