G2133

Sigma-Aldrich

Glucose Oxidase from Aspergillus niger

Type VII, lyophilized powder, ≥100,000 units/g solid (without added oxygen)

Synonim(y):
G.Od., β-D-Glucose:oxygen 1-oxidoreductase, GOx
Numer CAS:
Numer EC enzymu:
Numer EC:
Numer MDL:

Poziom jakości

200

typ

Type VII

formularz

lyophilized powder

specific activity

≥100,000 units/g solid (without added oxygen)

masa cząsteczkowa

160 kDa

nie zawiera

extender

skład

Protein, ≥60%

Wyróżniony przemysł

Diagnostic Assay Manufacturing

działalność zagraniczna

Catalase ≤10 Sigma units/mg protein

wysyłka w ciągu

wet ice

temp. przechowywania

−20°C

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Opis ogólny

Molecular Weight: 160 kDa (gel filtration)
pI: 4.2
Extinction coefficient: E1% = 16.7 (280 nm)

Glucose oxidase from Aspergillus niger is a dimer consisting of 2 equal subunits with a molecular mass of 80 kDa each. Each subunit contains one flavin adenine dinulceotide moiety and one iron. The enzyme is a glycoprotein containing ~16% neutral sugar and 2% amino sugars. The enzyme also contains 3 cysteine residues and 8 potential sites for N-linked glycosylation.

Glucose oxidase is capable of oxidizing D-aldohexoses, monodeoxy-D-glucoses, and methyl-D-glucoses at varying rates.

The pH optimum for glucose oxidase is 5.5, while it has a broad activity range of pH 4-7. Glucose oxidase is specific for β-D-glucose with a KM of 33-110 mM.

Glucose oxidase does not require any activators, but it is inhibited by Ag+, Hg2+, Cu2+, phenylmercuric acetate, and p-chloromercuribenzoate. It is not inhibited by the nonmetallic SH reagents: N-ethylmaleimide, iodoacetate, and iodoacetamide.

Glucose oxidase can be utilized in the enzymatic determination of D-glucose in solution. As glucose oxidase oxidizes β-D-glucose to D-gluconolactate and hydrogen peroxide, horseradish peroxidase is often used as the coupling enzyme for glucose determination. Although glucose oxidase is specific for β-D-glucose, solutions of D-glucose can be quantified as α-D-glucose will mutorotate to β-D-glucose as the β-D-glucose is consumed by the enzymatic reaction.

Zastosowanie

Several publications cite use of the G2133 glucose oxidase in their protocols and in various applications, such as the following:
a) Biosensor development:
  • Diazoresin nanofilm coatings on alginate microspheres: Srivastava, R. et al., Biotechnol. Bioeng., 91(1), 124-131 (2005).
  • Paper-based glucose biosensor: Lankelma, J. et al., Anal. Chem., 84(9), 417-4152 (2012)
  • Microfluidic device with glucose oxidase immobilized on hydrogel for glucose analysis of blood: He, R.-Y. et al., RSC Adv., 9, 32367-32374 (2019).
b) Single-molecule FRET study of human RAD51 filament formation: Subramanyam, S. et al., Methods Enzymol., 600, 201-232 (2018).
c) Enzymatic fuel-cells with chitosan-based membranes: Bahar, T., and Yazici, M.S., Electroanalysis, 32(6), 1304-1314 (2020).
Glucose oxidase is widely used in the food and pharmaceutical industries as well as a major component of glucose biosensors.

Działania biochem./fizjol.

Glucose oxidase catalyses the oxidation of β-d-glucose to d-glucono-β-lactone and hydrogen peroxide, with molecular oxygen as an electron acceptor.

Jakość

May contain traces of amylase, maltase, glycogenase, invertase, and galactose oxidase.

Definicja jednostki

One unit will oxidize 1.0 μmole of β-D-glucose to D-gluconolactone and H2O2 per min at pH 5.1 at 35 °C, equivalent to an O2 uptake of 22.4 μl per min. If the reaction mixture is saturated with oxygen, the activity may increase by up to 100%.

Postać fizyczna

Lyophilized powder containing phosphate buffer salts and sodium chloride

Komentarz do analizy

Protein determined by biuret.

piktogramy

Health hazard

Hasło ostrzegawcze

Danger

Zwroty wskazujące rodzaj zagrożenia

Zwroty wskazujące środki ostrożności

hazcat

Resp. Sens. 1

storage_class_code

11 - Combustible Solids

WGK Germany

WGK 1

Środki ochrony indywidualnej

dust mask type N95 (US), Eyeshields, Faceshields, Gloves

Certyfikat analizy

Świadectwo pochodzenia

Komal Sodhi et al.
Scientific reports, 8(1), 9721-9721 (2018-06-28)
As aging involves oxidant injury, we examined the role of the recently described Na/K-ATPase oxidant amplification loop (NKAL). First, C57Bl6 old mice were given a western diet to stimulate oxidant injury or pNaKtide to antagonize the NKAL. The western diet...
Feng Liu et al.
The Journal of investigative dermatology, 129(2), 422-431 (2008-10-31)
Microphthalmia-associated transcription factor (MiTF) is a key transcription factor for melanocyte lineage survival. Most previous work on this gene has been focused on its role in development. A role in carcinogenesis has emerged recently, but the mechanism is unclear. We...
Amjad Askary et al.
Nature biotechnology, 38(1), 66-75 (2019-11-20)
Molecular barcoding technologies that uniquely identify single cells are hampered by limitations in barcode measurement. Readout by sequencing does not preserve the spatial organization of cells in tissues, whereas imaging methods preserve spatial structure but are less sensitive to barcode...
Hua Zhang et al.
Cancer cell, 37(1), 37-54 (2019-12-31)
Cyclin-dependent kinase 7 (CDK7) is a central regulator of the cell cycle and gene transcription. However, little is known about its impact on genomic instability and cancer immunity. Using a selective CDK7 inhibitor, YKL-5-124, we demonstrated that CDK7 inhibition predominately...
Jaya G Yodh et al.
The EMBO journal, 28(4), 405-416 (2009-01-24)
Bloom syndrome (BS) is a rare genetic disorder characterized by genomic instability and a high predisposition to cancer. The gene defective in BS, BLM, encodes a member of the RecQ family of 3'-5' DNA helicases, and is proposed to function...
Protokoły
Enzymatic Assay of Glucose Oxidase
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