phytase

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phytase

[′fī‚tās]
(biochemistry)
An enzyme occurring in plants, especially cereals, which catalyzes hydrolysis of phytic acid to inositol and phosphoric acid.
References in periodicals archive ?
The efficacy of a novel microbial 6-phytase expressed in aspergillus oryzae on the performance and phosphorus utilization of cold- and warm-water fish: rainbow trout, Oncorhynchus mykiss,
Alternatively, according to the initiation site of dephosphorylation of the phytate, the ENZYME database (available through the ExPASy Proteomics Server: http://enzyme.expasy.org/) classifies phytases into three groups: 3-phytase (alternative name, 1-phytase; EC 3.1.3.8), 4-phytase (alternative name, 6-phytase; Ec 3.1.3.26), and 5-phytase (EC 3.1.3.72).
The company has also recently launched Finase[R] EC, its second generation 6-phytase from E.coli, in Europe.
The enzyme mixture (Axtra XAP 101 TPT, Cedar Rapids, IA, USA) was derived from Bacillus subtilis, Trichoderma longibrachiatum, and Bacillus licheniformis and contained endo-1, 4-beta-xylanase 20,000 U/g, amylase 2,000 U/g and protease 40,000 U/g activities, and 6-phytase (Axtra PHY 10000 TPT, USA) was derived from Trichoderma reesei, 10,000 U/g activity
The experimental design was completely randomized, in a (4+1) x2 factorial arrangement, with four diets equally deficient in [sub.av]P supplemented with increasing levels of 6-phytase synthesized by Aspergillus oryzae (0; 750; 1,500 and 2,250FTU [kg.sup.-1] of diet) plus one positive control diet without phytase, formulated according to the nutritional recommendations of ROSTAGNO et al.
Phytases are divided into two categories, 3-phytase (EC 3.1.3.8) and 6-phytase (EC 3.1.3.26), based on the site where the hydrolysis of the phytate molecule is initiated [1].