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Catalase is a tetramer of four polypeptide chains, each over 500 amino acids long. [7] It contains four iron-containing heme groups that allow the enzyme to react with hydrogen peroxide. The optimum pH for human catalase is approximately 7, [8] and has a fairly broad maximum: the rate of reaction does not change appreciably between pH 6.8 and 7 ...
Sizes range from just 62 amino acid residues, ... Optimum pH pH description Pepsin 1.5–1.6 ... Catalase 7.0 Neutral Urease 7.0 Neutral
The catalase operates over a temperature range from 30 °C to over 94 °C and a pH range from 6–10. This catalase is extremely stable compared to other catalases at high temperatures and pH. In a comparative study, the T. brockianus catalase exhibited a half life of 15 days at 80 °C and pH 10 while a catalase derived from Aspergillus niger ...
The optimum pH is 7.4 and optimum temperature is 60 °C. ... A wide range of urease inhibitors of different structural families are known.
Alcaligenes faecalis is a species of Gram-negative, rod-shaped bacteria commonly found in the environment.It was originally named for its first discovery in feces, but was later found to be common in soil, water, and environments in association with humans.
While a number of inhibitory strategies exist such as high temperature treatments(70-90 °C) to eliminate catechol oxidase catalytic activity, [6] a popular strategy is decreasing the pH with citric acid. Catechol oxidase is more catalytically active in the pH 4-8 range due to coordination of the histidine residues to the catalytic copper centers.
For most relevant industrial applications, the turnover frequency is in the range of 10 −2 – 10 2 s −1 (10 3 – 10 7 s −1 for enzymes). [4] The enzyme catalase has the largest turnover frequency, with values up to 4 × 10 7 s −1 having been reported.
The enzyme unit, or international unit for enzyme (symbol U, sometimes also IU) is a unit of enzyme's catalytic activity. [1]1 U (μmol/min) is defined as the amount of the enzyme that catalyzes the conversion of one micro mole of substrate per minute under the specified conditions of the assay method.