catalase


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catalase

 [kat´ah-lās]
a hemoprotein enzyme that specifically catalyzes the decomposition of hydrogen peroxide and is found in almost all cells except certain anaerobic bacteria. Deficiency results in acatalasia. adj., adj catalat´ic.

cat·a·lase

(kat'ă-lās), [MIM*115500]
A hemoprotein catalyzing the decomposition of hydrogen peroxide to water and oxygen (2H2O2 → O2 + 2H2O); a deficiency of catalase is associated with acatalasemia.

catalase

(kăt′l-ās′, -āz′)
n.
An enzyme found in living cells that catalyzes the decomposition of hydrogen peroxide, a potentially harmful oxidizing agent, into water and oxygen.

cat′a·lat′ic (kăt′l-ăt′ĭk) adj.

CAT

A gene on chromosome 11p13 that encodes catalase, an enzyme which plays a central role in the body’s defence against oxidative stress, converting the reactive oxygen species hydrogen peroxide (H2O2) to water and oxygen, thereby mitigating H2O2’s toxic effects.

Molecular pathology
Defects in CAT cause acatalasemia. Oxidative stress may play a role in the development of chronic or late-onset diseases—e.g., diabetes, asthma, Alzheimer's disease, systemic lupus erythematosus, rheumatoid arthritis and cancer.

cat·a·lase

(kat'ă-lās)
A hemoprotein catalyzing the decomposition of hydrogen peroxide to water and oxygen (2H2O2→ O2 + 2H2O).

catalase

An ENZYME found in the microbodies (peroxisomes) of cells and that promotes the reaction in which two molecules of hydrogen peroxide are converted to two molecules of water and one molecule of oxygen.

catalase

an iron-containing ENZYME found in tissues such as liver and potato tubers whose function is to catalyse the breakdown of toxic hydrogen peroxide, a by-product of aerobic respiration, into water and oxygen:

Catalase has the highest known TURNOVER RATE and works by reducing the ACTIVATION ENERGY required from about 80 kJ to less than 10 kJ.

References in periodicals archive ?
Catalase (EC 1.11.1.6) is an important antioxidant enzyme that has main function in protecting the cells from the accumulation of hydrogen peroxide by converting it to water and molecular oxygen.
(2007) demonstrated that in seeds of Picea omorika, which also have rigid tegument, the increase of catalase and peroxidase might be involved in the protection of the seeds against free radicals, assisting germination.
Linkage map of the short arm of human chromosome 11: location of the genes for catalase, calcitonin, and insulin-like growth factor II.
of Protease Tissue Lipase Urease isolates tested utilization +ve -ve +ve -ve +ve -ve +ve -ve Aspergillus 20 16 4 20 - 16 4 19 1 flavus Aspergillus 15 13 2 15 - 14 2 15 - fumigatus Aspergillus 30 26 4 30 - 27 4 19 11 niger Aspergillus 15 11 4 15 - 9 4 15 - terreus Total 80 66 14 80 - 66 14 68 12 Fungal Hemolysis Phospholipase Catalase Peroxidase isolates +ve -ve +ve -ve +ve -ve +ve -ve Aspergillus 20 - 20 - 20 - 20 - flavus Aspergillus 15 - 12 3 15 - 15 - fumigatus Aspergillus 20 10 30 - 30 - 30 - niger Aspergillus 15 5 10 5 15 - 15 - terreus Total 70 15 72 8 80 - 80 - Fungal Toxins No.
What accounts for this study is the function and responsibility of the 2 enzymes: glutathione reductase and catalase which are essential for many physiological responses of the body (7).
Changes in ascorbate peroxidase, catalase, guaiacol peroxidase and superoxide dismutase activities in common bean (Phaseolus vulgaris) nodules under salt stress.
Thauer, "Characterization of a heme-dependent catalase from Methanobrevibacter arboriphilus," Applied and Environmental Microbiology, vol.
The comparison of electrocatalytic performances was evaluated by using catalase as model redox protein and comparing the voltammetric behavior (Figures 1(a) and 1(b)) measuring several electrochemical parameters (see Section 3.4).
Resistance of tumour cells against intercellular signalling depends on interference through peroxidase and catalase expression on the cell membrane.
Regarding catalase regulation in follicular growth, the activity of catalase in granulosa cells from large follicles has been observed to be several times higher than that in small and medium follicles in various mammals, such as pigs [62], goats [63], and rats [64].
Table (3) showed that catalase activity showed a significant decrease in patients group when compared to control group p<0.05.
(17) Catalase activity was assayed by the method of Clairborne.