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Literature summary extracted from

  • Stark, G.R.; Dawson, C.R.
    Ascorbic acid oxidase (1963), The Enzymes, 2nd Ed (Boyer, P. D. , Lardy, H. , Myrbäck, K. , eds. ), 8, 297-311.
No PubMed abstract available

General Stability

EC Number General Stability Organism
1.10.3.3 gelatin, catalase, peroxidase and methemoglobin protect against inactivation Cucurbita pepo condensa

Inhibitors

EC Number Inhibitors Comment Organism Structure
1.10.3.3 3,4,5-hydroxybenzoic acid propyl ester
-
Cucurbita pepo condensa
1.10.3.3 3,4-Dichlorophenylserine
-
Cucurbita pepo condensa
1.10.3.3 8-hydroxyquinoline
-
Cucurbita pepo condensa
1.10.3.3 alpha-tocopherol
-
Cucurbita pepo condensa
1.10.3.3 Anthocyanin pigments
-
Cucurbita pepo condensa
1.10.3.3 Auxin analogs
-
Cucurbita pepo condensa
1.10.3.3 azide
-
Cucurbita pepo condensa
1.10.3.3 Carotenes
-
Cucurbita pepo condensa
1.10.3.3 Cu2+
-
Cucurbita pepo condensa
1.10.3.3 Cupferron
-
Cucurbita pepo condensa
1.10.3.3 cyanide
-
Cucurbita pepo condensa
1.10.3.3 deoxycorticosterone
-
Cucurbita pepo condensa
1.10.3.3 diethyldithiocarbamate
-
Cucurbita pepo condensa
1.10.3.3 ethyl xanthate
-
Cucurbita pepo condensa
1.10.3.3 H2O2
-
Cucurbita pepo condensa
1.10.3.3 H2S
-
Cucurbita pepo condensa
1.10.3.3 Hg2+ 0.01 mM, appreciable inhibition Cucurbita pepo condensa
1.10.3.3 iodoacetate
-
Cucurbita pepo condensa
1.10.3.3 leucocyanidol
-
Cucurbita pepo condensa
1.10.3.3 additional information natural inhibitors: cabbage extract, tomato extract, strawberry juice, extract of lemons, oranges, parsley, hips, leeks Cucurbita pepo condensa
1.10.3.3 Ni2+ some authors found inhibition, others not Cucurbita pepo condensa
1.10.3.3 nordihydroguaiaretic acid
-
Cucurbita pepo condensa
1.10.3.3 organic mercurials
-
Cucurbita pepo condensa
1.10.3.3 p-mercuribenzoate some authors report inhibition, others do not Cucurbita pepo condensa
1.10.3.3 Pyridine-KCNS
-
Cucurbita pepo condensa
1.10.3.3 Salicylaldoxime
-
Cucurbita pepo condensa
1.10.3.3 SO2
-
Cucurbita pepo condensa
1.10.3.3 Tetraethylthiuramidisulfide
-
Cucurbita pepo condensa
1.10.3.3 thiamine
-
Cucurbita pepo condensa
1.10.3.3 Thiourea
-
Cucurbita pepo condensa
1.10.3.3 Zn2+ some authors found inhibition, others not Cucurbita pepo condensa

KM Value [mM]

EC Number KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
1.10.3.3 0.039
-
L-ascorbate spectrometric assay Cucurbita pepo condensa
1.10.3.3 0.24
-
L-ascorbate spectrometric assay Cucurbita pepo condensa
1.10.3.3 0.42
-
L-ascorbate manomeric assay following the rate of O2 uptake Cucurbita pepo condensa
1.10.3.3 2
-
L-ascorbate manomeric assay following the rate of O2 uptake Cucurbita pepo condensa
1.10.3.3 5
-
L-ascorbate manomeric assay following the rate of O2 uptake Cucurbita pepo condensa

Metals/Ions

EC Number Metals/Ions Comment Organism Structure
1.10.3.3 copper a multicopper protein, 6 atoms of copper per enzyme molecule Cucurbita pepo condensa

Organism

EC Number Organism UniProt Comment Textmining
1.10.3.3 Cucurbita pepo condensa
-
-
-

Posttranslational Modification

EC Number Posttranslational Modification Comment Organism
1.10.3.3 glycoprotein enzyme may be a protein-copper carbohydrate complex Cucurbita pepo condensa

Reaction

EC Number Reaction Comment Organism Reaction ID
1.10.3.3 4 L-ascorbate + O2 = 4 monodehydroascorbate + 2 H2O mechanism: Cu2+ is reduced to Cu+, which is then reoxidized by oxygen Cucurbita pepo condensa

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
1.10.3.3 2 hydroquinone + O2 at pH 7.2 Cucurbita pepo condensa 2 quinone + 2 H2O
-
?
1.10.3.3 2 L-ascorbate + O2 no appreciable activity with: p-phenylenediamine, Na2S2O3, glutathione and cysteine Cucurbita pepo condensa 2 L-dehydroascorbate + 2 H2O
-
?
1.10.3.3 2,5-dichlorohydroquinone + O2
-
Cucurbita pepo condensa 2,5-dichloroquinone + H2O
-
?
1.10.3.3 2,6-dichlorohydroquinone + O2
-
Cucurbita pepo condensa 2,6-dichloroquinone + H2O
-
?
1.10.3.3 D-glucoascorbic acid + O2
-
Cucurbita pepo condensa D-glucodehydroascorbate + H2O
-
?
1.10.3.3 D-isoascorbic acid + O2
-
Cucurbita pepo condensa 2-dehydroisoascorbate + H2O
-
?

Turnover Number [1/s]

EC Number Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
1.10.3.3 4170
-
L-ascorbate manometric assay Cucurbita pepo condensa
1.10.3.3 10800
-
L-ascorbate spectrometric assay Cucurbita pepo condensa

pH Optimum

EC Number pH Optimum Minimum pH Optimum Maximum Comment Organism
1.10.3.3 5.6
-
-
Cucurbita pepo condensa

pH Stability

EC Number pH Stability pH Stability Maximum Comment Organism
1.10.3.3 4
-
irreversible loss of activity below Cucurbita pepo condensa