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Production, characteristics and applications of phytase from a rhizosphere isolated Enterobacter sp ACSS

机译:根际分离的肠杆菌属ACSS植酸酶的生产,特性及应用

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Optimization of process parameters for phytase production by Enterobacter sp. ACSS led to a 4.6-fold improvement in submerged fermentation, which was enhanced further in fed-batch fermentation. The purified 62 kDa monomeric phytase was optimally active at pH 2.5 and 60 A degrees C and retained activity over a wide range of temperature (40-80 A degrees C) and pH (2.0-6.0) with a half-life of 11.3 min at 80 A degrees C. The kinetic parameters K (m), V (max), K (cat), and K (cat)/K (m) of the pure phytase were 0.21 mM, 131.58 nmol mg(-1) s(-1), 1.64 x 10(3) s(-1), and 7.81 x 10(6) M-1 s(-1), respectively. The enzyme was fairly stable in the presence of pepsin under physiological conditions. It was stimulated by Ca+2, Mg+2 and Mn+2, but inhibited by Zn+2, Cu+2, Fe+2, Pb+2, Ba+2 and surfactants. The enzyme can be applied in dephytinizing animal feeds, and the baking industry.
机译:肠杆菌生产植酸酶过程参数的优化。 ACSS导致深层发酵提高了4.6倍,分批补料发酵得到了进一步提高。纯化的62 kDa单体肌醇六磷酸酶在pH 2.5和60 A的温度下具有最佳活性,并在很宽的温度范围(40-80 A℃)和pH(2.0-6.0)内保持活性,其半衰期为11.3分钟。 80 A摄氏度。纯植酸酶的动力学参数K(m),V(max),K(cat)和K(cat)/ K(m)为0.21 mM,131.58 nmol mg(-1)s( -1),1.64 x 10(3)s(-1)和7.81 x 10(6)M-1 s(-1)。在胃蛋白酶存在下,在生理条件下,该酶相当稳定。它受到Ca + 2,Mg + 2和Mn + 2的刺激,但受到Zn + 2,Cu + 2,Fe + 2,Pb + 2,Ba + 2和表面活性剂的抑制。该酶可用于动物饲料的脱除草剂和烘焙行业。

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