In biochemistry, an oxidase is any kind of enzyme that brings about an oxidation-reduction reaction involving the oxygen molecule as the electron receptor. There are many kinds of oxidases, including the cytochrome c oxidase, an essential enzyme that allows a living body to use oxygen in the generation of energy. The cytochrome c oxidase is also the final component of the electron transfer chain.
The glucose oxidase is an oxido-reductase enzyme that brings about the oxidation of glucose to hydrogen peroxide and glucono delta-lactone. In living cells, glucose oxidase helps in breaking sugar molecules down into its metabolites. This enzyme is widely used for determining the free glucose in body fluids, as well as in the food industry. Glucose oxidase is also an important substance in various fields of biotechnologies, biochemistry, and even nanotechnologies.
Monoamine oxidases, on the other hand, are a family of enzymes that bring about the oxidation of monoamines. They are typically bound to the outer memberane of mitochondria in just about any cell type in the body. This enzyme was discovered by the British biochemist Mary Bernheim in the liver and she named it tyramine oxidase.
Xanthine oxidase is basically a form of xanthine oxidoreductase, an enzyme that produces reactive oxygen species. It brings about the oxidation of hypoxanthine into xanthine, and pushes the catalyzing process further into oxidizing xanthine to uric acid. Xanthine oxidase has an essential role in the catabolism of purines in many species, including humans.
In the study of microbiogy, oxidases are used in the oxidase test, which is instrumental in the phenotypic characteristic for the identification of a variety of bacterial strains. The oxidase test also determines whether a specific bacterium sample produces cytochrome oxidases, and can therefore use oxygen with an electron transfer chain.
This category contains scientific information on oxidase, any kind of enzyme that brings about an oxidation-reduction reaction with an oxygen molecule as the electron receptor.
Bolwell, G. P.; Butt, V. S., 1983: Photo induced changes in o di phenol oxidase ec 18.104.22.168 and p coumarate hydroxylase ec 22.214.171.124 activities in spinach beet beta vulgaris seedlings and leaves. Phytochemistry (Oxford) 22(1): 37-46 Whereas illumination of mature leaf discs and prolonged illumination of spinach beet seedlings gave rise to co-ordinated increases in [...]
Hullett J., 1986: Phosphatidylserine inhibition of monoamine oxidase in platelets of schizophrenics. Biological Psychiatry: 59-68 Phosphatidylserine (Ps) has recently been reported to be a specific inhibitor of B-type monoamine oxidase (Mao-B). The effect of added Ps liposomes on platelet Mao-B activity was examined in two schizophrenic groups (paranoid and a mixture of residual/undifferentiated) and in [...]
Fridovich I., 1986: Phosphate inhibition of the copper and zinc containing superoxide dismutase a reexamination. Biochemistry: 6084-6088 Phosphate was reported to be an inibitor of copper- and zinc-containing superoxide dismutase (Sod) Thus Sod activity, in 50 mM 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (Hepes) (pH 7.4), was decreased by approximately 50% when the assay was made 10 mM in [...]
Imha S.S., 1979: Phosphatases and poly phenol oxidase in 3 trematodes of rana tigrina. Helminthologia (bratislava): 63-72 The acid phosphatase, alkaline phosphatase, and polyphenol oxidase activity is reported for 3 trematode parasites of R. tigrina (Tremiorchis ranarum Mehra et Negi, 1926; Ganeo tigrinum Mehra et Negi, 1928 and Mehraorchis ranarum Srivastava, 1934). The effect of [...]
Frederiksen W., 1984: Phenotypic differentiation of cardiobacterium hominis kingella indologenes and cdc group ef 4. European Journal Of Clinical Microbiology: 230-235 Eleven strains of C. hominis, 2 strains of K. indologenes and 6 strains of Cdc group Ef-4 were characterized. Since all 3 taxa are oxidase-positive, fastidious gram-negative rods with relatively few positive reactions, they [...]
Lipsky P.E., 1983: Phenotype of the accessory cell necessary for mitogen stimulated t and b cell responses in human peripheral blood delineation by its sensitivity to the lysosomotropic agent l leucine methyl ester. Journal Of Immunology: 2282-2290 The lysosomotropic compound L-leucine methyl ester (Leu-OMe) was used to delineate the phenotype of the accessory cells involved [...]
Barrett F.M., 1987: Phenoloxidases from larval cuticle of the sheep blowfly lucilia cuprina characterization developmental changes and inhibition by antiphenol oxidase antibodies. Archives Of Insect Biochemistry & Physiology: 99-118 A tyrosinase, enzyme A (Ec 126.96.36.199, o-diphenol: O2 oxidoreductase), and a laccase, enzyme B (Ec 188.8.131.52, – O2 oxidoreductase), have been partially purified and characterized from [...]
Baruah P., 1979: Phenolic enzymes in the shorea robusta timber during the pathogenesis by irpex destruens. Indian Journal Of Plant Physiology: 36-43 During pathogenesis in the dead timber of S. robusta, destruens produced 2 types of phenol oxidases, laccase and tyrosinase a rare occurrence. Because of the production of 2 types of phenolic enzymes, this [...]
Cole R.A., 1984: Phenolic acids associated with the resistance of lettuce lactuca sativa cultivars to the lettuce root aphid pemphigus bursarius. Annals Of Applied Biology: 129-146 Phenolic acids, particularly caffeoylquinic acids, in lettuce root extracts were analyzed by high pressure liquid chromatography (hplc), gas liquid chromatography (glc) and Uv absorbance to seek a relationship with [...]