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ydrogen peroxide down until it touches the bacteria if bubbles form on contact this indicates a positive catalase result this test can detect catalase positive bacteria at concentrations above about 10 5 cells ml 51 and is simple to use bacterial virulence edit neutrophils and other phagocytes use peroxide to kill bacteria the enzyme nadph oxidase generates superoxide within the phagosome which is converted via hydrogen peroxide to other oxidising substances like hypochlorous acid which kill phagocytosed pathogens 52 in individuals with chronic granulomatous disease cgd phagocytic peroxide production is impaired due to a defective nadph oxidase system normal cellular metabolism will still produce a small amount of peroxide and this peroxide can be used to produce hypochlorous acid to eradicate the bacterial infection however if individuals with cgd are infected with catalase positive bacteria the bacterial catalase can destroy the excess peroxide before it can be used to produce other oxidising substances in these individuals the pathogen survives and becomes a chronic infection this chronic infection is typically surrounded by macrophages in an attempt to isolate the infection this wall of macrophages surrounding a pathogen is called a granuloma many bacteria are catalase positive but some are better catalase producers than others some catalase positive bacteria and fungi include nocardia pseudomonas listeria aspergillus candida e coli staphylococcus serratia b cepacia and h pylori 53 acatalasia edit acatalasia is a condition caused by homozygous mutations in cat resulting in a lack of catalase symptoms are mild and include oral ulcers a heterozygous cat mutation results in lower but still present catalase 54 gray hair edit low levels of catalase may play a role in the graying process of human hair hydrogen peroxide is naturally produced by the body and broken down by catalase hydrogen peroxide can accumulate in hair follicles and if catalase levels decline this buildup can cause oxidative stress and graying 55 these low levels of catalase are associated with old age hydrogen peroxide interferes with the production of melanin the pigment that gives hair its color 56 57 interactions edit catalase has been shown to interact with the abl2 58 and abl genes 58 infection with the murine leukemia virus causes catalase activity to decline in the lungs heart and kidneys of mice conversely dietary fish oil increased catalase activity in the heart and kidneys of mice 59 methods for determining catalase activity edit in 1870 schoenn discovered a formation of yellow color from the interaction of hydrogen peroxide with molybdate 60 then from the middle of the 20th century this reaction began to be used for colorimetric determination of unreacted hydrogen peroxide in the catalase activity assay 61 the reaction became widely used after publications by korolyuk et al 1988 62 and goth 1991 63 the first paper describes serum catalase assay with no buffer in the reaction medium the latter describes the procedure based on phosphate buffer as a reaction medium since phosphate ion reacts with ammonium molybdate 63 the use of mops buffer as a reaction medium is more appropriate 64 direct uv measurement of the decrease in the concentration of hydrogen peroxide is also widely used after the publications by beers sizer 65 and aebi 66 see also edit enzyme kinetics glutathione peroxidase peroxidase superoxide dismutase references edit 1 2 3 grch38 ensembl release 89 ensg00000121691 ensembl may 2017 1 2 3 grcm38 ensembl release 89 ensmusg00000027187 ensembl may 2017 human pubmed reference national center for biotechnology information u s national library of medicine mouse pubmed reference national center for biotechnology information u s national library of medicine chelikani p fita i loewen pc january 2004 diversity of structures and properties among catalases cellular and molecular life sciences 61 2 192 208 doi 10 1007 s00018 003 3206 5 hdl 10261 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bourne y tainer ja february 2000 active and inhibited human catalase structures ligand and nadph binding and catalytic mechanism journal of molecular biology 296 1 295 309 doi 10 1006 jmbi 1999 3458 pmid 10656833 loew o may 1900 a new enzyme of general occurrence in organisms science 11 279 701 702 bibcode 1900sci 11 701l doi 10 1126 science 11 279 701 jstor 1625707 pmid 17751716 sumner jb dounce al april 1937 crystalline catalase science 85 2206 366 367 bibcode 1937sci 85 366s doi 10 1126 science 85 2206 366 pmid 17776781 sumner jb gralén n march 1938 the molecular weight of crystalline catalase science 87 2256 284 bibcode 1938sci 87 284s doi 10 1126 science 87 2256 284 pmid 17831682 s2cid 36931581 schroeder wa shelton jr shelton jb robberson b apell g may 1969 the amino acid sequence of bovine liver catalase a preliminary report archives of biochemistry and biophysics 131 2 653 655 doi 10 1016 0003 9861 69 90441 x pmid 4892021 murthy mr reid tj sicignano a tanaka n rossmann mg 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