A hemoprotein. A manganese protein containing MnIII in the resting state, which also belongs here, is often called pseudocatalase. The enzymes from some organisms, such as Penicillium simplicissimum, can also act as a peroxidase (EC 1.11.1.7) for which several organic substances, especially ethanol, can act as a hydrogen donor. Enzymes that exhibit both catalase and peroxidase activity belong under EC 1.11.1.21, catalase-peroxidase.
A hemoprotein. A manganese protein containing MnIII in the resting state, which also belongs here, is often called pseudocatalase. The enzymes from some organisms, such as Penicillium simplicissimum, can also act as a peroxidase (EC 1.11.1.7) for which several organic substances, especially ethanol, can act as a hydrogen donor. Enzymes that exhibit both catalase and peroxidase activity belong under EC 1.11.1.21, catalase-peroxidase.
the enzyme does not interact with Brij 35 micelles, enzyme exhibits superactivity in the reverse micells formed by 0.1 M Brij 30 in heptane, isooctane, and dodecane, but not in decaline
nitrite effectively reduces inactive catalase compound II to the ferric enzyme. Presence of chloride significantly enhances nitrite-induced catalase inhibition
generated from 1-(N,N-diethylamino)diazen-1-ium-1,2-diolate, competitive inhibitor, nitrosylated catalase is kinetically labile, NO tends to dissociate rapidly from the active site, binding structure, overview. Kinetic analysis of dissociation of NO from the enzyme-inhibitor complex
decrease in enzyme activity without changing the mechanism. The inhibition efficiency is elevated by two orders of magnitude and also increases with decrease in pH in the presence of 150 mM chloride or 150 mM bromide or 0.050 mM thiocyanate. In presence of oxyhemoglobin plus o-phenanthroline, the inhibitory effect is sharply attenuated
efficiency of inhibition sharply increases in presence of chloride, bromide, thiocyanate. Inhibition involves NO+ ions rather than NO molecules due to nitrosation of enzyme, and the enhancement of inhibition in presence of halide ions may be caused by nitrosyl halide formation
enzyme activity at pH 7.0, 23°C, in nonionic micellar and reverse micellar systems, formed by mixing of Brij 30, Brij 35, cyclohexane, decaline, dodecane, n-heptane or isooctane, and water, overview
retinal. mRNA transcript for catalase in normal (5.5 mM) glucose medium or high (22 mM) glucose medium after 1, 3, or 5 days of stimulation. The pattern of relative expression of the pericyte catalase transcript at day 1 is essentially unchanged at 3 and 5 days with only a slightly higher value (10%) in high glucose medium, which is statistically significantly increased after 1 (p = 0.037), 3 (p = 0.037), and 5 (p = 0.025) days
catalases, heme enzymes, which catalyze decomposition of hydrogen peroxide to water and molecular oxygen, belong to the antioxidant defense system of the cell
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CRYSTALLIZATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
fee enzyme and enzyme complexed with ammonia or NO, hanging drop vapor diffusion method, mixing of 0.004 ml of 12-13 mg/ml protein, containing NH4OH, with an equal volume of the reservoir solution consisting of 45-60 mM magnesium formate, pH 6.7, 2-3 weeks, soaking of crystals in ligand solutions, X-ray diffraction structure determination and analysis at 1.88-1.99 A resolution
purified catalase form III, sitting drop vapour diffusion method, mixing of 40 mg/ml protein in 0.05 M sodium phosphate, pH 6.8, with reservoir solution containing 12% PEG 4000 and 0.05 M sodium phosphate, pH 6.8, X-ray diffraction structure determination and analysis at 2.69 A resolution
enzyme immobilization via precipitation with ammonium sulfate and then crosslinking with glutaraldehyde, method development. The immoblized enzyme shows about 50% of free enzyme activity, its thermal and storage stabilities are improved compared to the free catalase and the remaining activity of immobilized CLEA-CAT-BSA enzyme derivative is 50% of its initial activity at the end of 400 consecutive uses in a batch type-reactor
immobilized catalase onto controlled pore glass retains 80% of its maximum activity at pH 9.0, while free catalase retains only 40% of its maximum activity at pH 9.0
the half-lives of free catalase at 35 and 50°C were 9.0 and 6.7 h, respectively and these correspondingly are 70.0 and 9.7 h for immobilized catalase onto controlled pore glass
enzyme in homogenous aqueous solution: half-life is 19.0 h, enzyme in aqueous solution with Brij 35: half-life is 17.5 h, enzyme in reverse micelles of 0.1 M Brij 30 in n-heptane: half-life is 14.5 h
enzyme in homogenous aqueous solution: half-life is 35 min, enzyme in aqueous solution with Brij 35: half-life is 12 min, enzyme in reverse micelles of 0.1 M Brij 30 in n-heptane: half-life is 77 min
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GENERAL STABILITY
ORGANISM
UNIPROT
LITERATURE
enzyme stability at 23°C, 37°C or 50°C in nonionic micellar and reverse micellar systems, formed by mixing of Brij 30, Brij 35, cyclohexane, decaline, dodecane, n-heptane or isooctane, and water
free and immobilized catalases show their maximum activities at 50 mM buffer concentration. When the buffer concentration is increased from 25 to 100 mM, the activity of Eupergit C-immobilized catalase is more affected than the activity of free catalase. At 100 mM buffer concentration, free catalase retains 96.9% of its maximum activity although immobilized catalase retains 80% of its maximum activity
combination oflaccase and catalase in construction of H2O2-O2 based biocathode for applications in glucose biofuel cells. The deposited enzymes laccase and catalase by means of alternating current electrophoretic deposition (AC-EPD) do not inhibit each other and carry out about 90% of the catalytic reduction process of O2-H2O2
covalent immobilization of catalase on florisil via glutaraldehyde. Optimal immobilization is at pH 6.0, 10°C, leading to a vmax of immobilized enzyme of 20 mM H2O2 per min and mg protein and a 50fold increase in Km value. the immobilized enzyme retains 40% of initial activtiy after 50 uses and is more stable than free enzyme
glutathione-mediated superoxide generation in an aqueous solution is increased by presence of catalase. The catalase-exaggerated extracellular superoxide generation may give a harmful effect to living cells
improvement of thermal stability, resistance to protease degradation, and resistance to ascorbate inhibition, while retaining enzyme structure and activity, by conjugation to poly(acrylic acid). 55-80% and 90-100% activity is retained for all samples synthesized at pH 5.0 and pH 7.0, respectively, Km or Vmax values do not differ significantly from those of the free enzyme. Conjugates synthesized at pH 7.0 are thermally stable up to 85-90°C, and retain 40-90% of their original activities after storing for 10 weeks at 8°C