A0157
Ascorbate Oxidase from Cucurbita sp.
lyophilized powder, 1,000-3,000 units/mg protein
Synonym(s):
L-Ascorbate:oxygen oxidoreductase, Ascorbase
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About This Item
CAS Number:
UNSPSC Code:
12352204
NACRES:
NA.54
EC Number:
232-852-6
MDL number:
Specific activity:
1,000-3,000 units/mg protein
Biological source:
plant (Cucurbita spp.)
biological source
plant (Cucurbita spp.)
form
lyophilized powder
specific activity
1,000-3,000 units/mg protein
storage temp.
2-8°C
Quality Level
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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.
Application
Ascorbate Oxidase from Cucurbita sp. has been used:
- as a supplement in the culture medium for differentiation into osteoblasts
- to oxidize ascorbic acid producing monodehydroascorbate in monodehydroascorbate reductase assay
- in determining ascorbate (AsA) and dehydroascorbate (DHA) concentrations
Ascorbate oxidase, from Cucurbita sp., may be used to study oxidative stress and heat stress response and tolerance. Ascorbate oxidase, from Sigma, has been used in ascorbic acid assays to study the heat stress response of Arabidopsis .
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.
Ascorbate oxidase converts ascorbic acid to dehydroascorbic acid. It is highly specific for L-ascorbic acid and a few analogs. Ascorbate oxidase exists as a dimer and has a molecular weight of approximately 140 kDa.
Physical form
Lyophilized powder containing buffers and sucrose as stabilizer.
Other Notes
One unit will oxidize 1.0 μmole of L-ascorbate to dehydroascorbate per min at pH 5.6 at 25 °C.
signalword
Danger
hcodes
pcodes
Hazard Classifications
Resp. Sens. 1
Storage Class
11 - Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Gloves, type N95 (US)
Regulatory Information
低风险生物材料
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Cécile Garchery et al.
Plant, cell & environment, 36(1), 159-175 (2012-06-26)
The regulation of carbon allocation between photosynthetic source leaves and sink tissues in response to stress is an important factor controlling plant yield. Ascorbate oxidase is an apoplastic enzyme, which controls the redox state of the apoplastic ascorbate pool. RNA
Ethylene response factor 6 is a regulator of reactive oxygen species signaling in Arabidopsis
Sewelam N, et al.
PLoS ONE, 8(8), e70289-e70289 (2013)
A Messerschmidt et al.
Journal of molecular biology, 224(1), 179-205 (1992-03-05)
The crystal structure of the fully oxidized form of ascorbate oxidase (EC 1.10.3.3) from Zucchini has been refined at 1.90 A (1 A = 0.1 nm) resolution, using an energy-restrained least-squares refinement procedure. The refined model, which includes 8764 protein
Sudhakar Srivastava et al.
Protoplasma, 248(4), 805-815 (2010-12-29)
Arsenic (As) is a potential hazard to plants' health, however the mechanisms of its toxicity are yet to be properly understood. To determine the impact of redox state and energetic in stress imposition, plants of Hydrilla verticillata (L.f.) Royle, which
Direct electrochemistry of proteins and enzymes
Perspectives in bioanalysis, 1, 517-598 (2005)
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