C3515
Katalase aus Aspergillus niger
ammonium sulfate suspension, ≥4,000 units/mg protein
Synonym(e):
H2O2:H2O2 Oxidoreduktase
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About This Item
CAS-Nummer:
MDL-Nummer:
UNSPSC-Code:
12352204
eCl@ss:
32160410
NACRES:
NA.54
Empfohlene Produkte
Biologische Quelle
Aspergillus niger
Form
ammonium sulfate suspension
Spezifische Aktivität
≥4,000 units/mg protein
Mol-Gew.
tetramer ~250 kDa
Lagerbedingungen
(Tightly closed)
Methode(n)
FISH: suitable
Versandbedingung
wet ice
Lagertemp.
2-8°C
InChI
1S/C9H10O3/c1-2-12-9(11)7-3-5-8(10)6-4-7/h3-6,10H,2H2,1H3
InChIKey
NUVBSKCKDOMJSU-UHFFFAOYSA-N
Allgemeine Beschreibung
Research area: Cell Signaling
Catalase is an active enzyme present in aerobic organisms. It is a ferric hemoprotein and a tetramer.
Catalase is an active enzyme present in aerobic organisms. It is a ferric hemoprotein and a tetramer.
Anwendung
Catalase from Aspergillus niger has been used:
- as a positive control during the functional characterization of Clostridium difficile spore coat proteins.
- as a component of the catalase solution to prepare GLOX buffer with enzymes to maintain the embryos of Caenorhabditis elegans before single-molecule fluorescence in situ hybridization (smFISH) studies
- as a component of the imaging buffer for stochastic optical reconstruction microscopy (STORM) imaging of platelet-rich plasma
- as a supplement in Todd Hewitt media plus 0.5 % yeast extract (THY) media for the neutralization of pneumococcal H2O2
Biochem./physiol. Wirkung
Catalase catalyzes the decomposition of hydrogen peroxide into water and oxygen. Each subunit of the tetramer contains iron bound to a protoheme IX group. The enzyme also strongly binds NADP, which is in close proximity to the heme group. Isoelectric point is found to be 6.5. Optimum pH for catalytic activity is 7.0. The enzyme activity is inhibited by 3-amino-1-H-1,2,4 triazole, cyanide, azide, hydroxylamine, cyanogen bromide, 2-mercaptoethanol, dithiothreitol, dianisidine, and nitrate. Incubation of catalase with ascorbate or ascorbate/Cu2+ results in degradation of the catalase molecule.
Catalase is involved in catalyzing the degradation of hydrogen peroxide (H2O2) to water and free oxygen. Catalase is used commercially for decomposing H2O2 as it is added as an antimicrobial agent in process streams. It also catalyzes the oxidation of electron donors like ethanol and phenols during lower concentrations of H2O2. Catalase shows antioxidant activity by protecting cells from higher levels of reactive oxygen species (ROS). Increased expression of catalase is observed in chronic lymphocytic leukemia, gastric cancer, glioma, and melanoma. Decreased levels of catalase are seen in acute myeloid leukemia, lung, pancreatic, prostate, and skin (non-melanoma) cancers. Hence catalase exhibits a dual role in cancer.
Vorsicht
Das Gefrieren der Lösungen ist nicht empfehlenswert.
Einheitendefinition
1 U baut 1.0 μmol H2O2 pro Minute bei pH 7.0 und 25 °C ab, dabei fällt die H2O2-Konzentration von 10.3 zu 9.2 mM. Dies wird durch die Abnahme von A240 gemessen.
Physikalische Form
Suspension in 3.2 M (NH4)2SO4-Lösung, pH 6.0
Hinweis zur Analyse
Proteingehalt mittels Biuret-Reaktion bestimmt.
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Lagerklassenschlüssel
12 - Non Combustible Liquids
WGK
WGK 1
Flammpunkt (°F)
Not applicable
Flammpunkt (°C)
Not applicable
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Journal of applied microbiology, 89(1), 85-89 (2000-08-17)
A novel method for increasing dissolved oxygen concentration in culture media has been developed. It involves adding hydrogen peroxide (H2O2) to the medium which is then decomposed to oxygen and water by catalase. Some factors affecting oxygenation of culture were
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L Brunelli et al.
Free radical biology & medicine, 30(7), 709-714 (2001-03-29)
Previously, we found that catalase enhanced the protection afforded by superoxide dismutase to Escherichia coli against the simultaneous generation of superoxide and nitric oxide (Brunelli et al., Arch. Biochem. Biophys. 316:327-334, 1995). Hydrogen peroxide itself was not toxic in this
Artikel
Instructions for working with enzymes supplied as ammonium sulfate suspensions
Protokolle
This procedure may be used for all Catalase products.
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