9029-44-1

Basic information

• Product Name: ASCORBATE OXIDASE
• Synonyms: ASCORBASE;ASCORBATE OXIDASE;ASCORBATE OXIDASE CUCURBITA SPECIES;EC 1.10.3.3;EC: 1.10.3.3;L-ASCORBATE: OXYGEN OXIDOREDUCTASE;Oxidase, ascorbate;ASCORBATE OXIDASE FROM CUCURBITASPECIES
• CAS NO: 9029-44-1
• Molecular Weight: 0
• EINECS: 232-852-6
• Product Categories: enzyme
• Mol File: 9029-44-1.mol
• Article Data: 0

Chemical Properties

• Appearance: faintly bluish/powder
• Storage Temp.: 2-8°C
• Solubility: Soluble in aqueous buffers.
• CAS DataBase Reference: ASCORBATE OXIDASE(CAS DataBase Reference)
• NIST Chemistry Reference: ASCORBATE OXIDASE(9029-44-1)
• EPA Substance Registry System: ASCORBATE OXIDASE(9029-44-1)

Safety Data

• Safety Statements: 24/25
• WGK Germany: 3
• F: 10-21
• Hazardous Substances Data: 9029-44-1(Hazardous Substances Data)

Usage

Description

Ascorbate oxidase (AO) is a cell wall-localized enzyme that uses oxygen to catalyse the oxidation of ascorbate (AA) to the unstable radical monodehydroascorbate (MDHA) which rapidly disproportionates to yield dehydroascorbate (DHA) and AA, and thus contributes to the regulation of the AA redox state. Ascorbate oxidase is useful for enzymatic determination of ascorbic acid and for eliminating the interference of ascorbic acid in clinical analysis. Effect of Various Chemicals on Ascorbate oxidase.

Chemical Properties

Appearance : Light blue amorphous powder, lyophilized Stability : Store at －20℃ (A decrease in activity of ca.20% may occur at 5℃ within 6 months.) Molecular weight : 132,000, 140,000 Isoelectric point : between 6.0 and 7.8 , 8.2 Michaelis constant : 2.5×10－4M (Ascorbate) Structure : 8 copper atoms per mol of enzyme Inhibitors : cyanide, Na2S, diethyldithiocarbamate (Na) Optimum pH : 5.6 Optimum temperature : approx. 30℃ pH Stability : pH 7.0－10.0 (25℃, 17hr) Thermal stability : below 40℃ (pH 8.0, 30min) Substrate specificity : This enzyme oxidizes ascorbic acid and several ascorbic derivatives.

Uses

Ascorbate oxidase, from Cucurbita sp., may be used to study oxidative stress and heat stress response and tolerance. Also used in ascorbic acid assays to study the heat stress response of Arabidopsis and useful for enzymatic determination of ascorbic acid and for eliminating the interference of ascorbic acid in clinical analysis.

Definition

An enzyme found in plant tissue that acts upon ascorbic acid in the presence of oxygen to produce dehydroascorbic acid.

General Description

Ascorbate oxidase is a homodimeric enzyme, which comprises 552 amino acid residues per subunit (zucchini). It corresponds to a molecular mass of 70kDa per subunit. This enzyme is mainly found in plants, fungi and eubacteria.

Biochem/physiol Actions

Ascorbate oxidase (AO) participates in cell growth by regulating reduction/oxidation (redox) of the apoplast. This enzyme can synthesize the oxidative molecule dehydroascorbate acid (DHA) in the apoplast. It is also involved in cell elongation and enlargement development.