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Novel Long-Term Phytase from Serratia odorifera: Cloning, Expression, and Characterization
ACS Food Science & Technology ( IF 2.6 ) Pub Date : 2021-04-22 , DOI: 10.1021/acsfoodscitech.0c00074
Ignasi Salaet 1 , Ramon Marques 1 , Tula Yance-Chávez 1 , Judit Macías-Vidal 2 , David Gimémez-Zaragoza 3 , Rosa Aligue 3
Affiliation  

The appA-So gene, encoding a phytase from Serratia odorifera, was cloned and heterologously expressed in Komagataella phaffii. The open reading frame of appA-So comprised 1281 bp that encoded a 426-amino acid protein, including a 27-amino acid signal peptide. The encoded phytase, AppA-So, showed 52% homology with other histidine acid phosphatases. The purified recombinant phytase showed optimal activity at 55 °C and pH 4.5, exhibiting enzymatic activity between pH 3.7 and 5.8, with a specific activity of 1123 U/mg at pH 4.5 and 37 °C. The AppA-So protein retained more than 85% of its initial activity after incubation in different pH conditions (pH 2.5–6.5) at 37 °C for 3 h. AppA-So activity was maintained over time and displayed a low Michaelis–Menten constant (Km) of 0.093 g/L. To the best of our knowledge, this is the first report of the cloning and characterization of the phytase from S. odorifera. Comparison of AppA-So with other well-known phytases suggests that the S. odorifera phytase has the lowest Km and highest stable activity over time, making it very suitable for use in the animal feed industry.

中文翻译:

新型Serratia odorifera的长期植酸酶:克隆,表达和表征

克隆了编码臭味沙雷氏菌植酸酶的appA-So基因,并在Komagataella phaffii中异源表达。appA-So的开放阅读框架包含1281bp的编码426个氨基酸的蛋白质,包括27个氨基酸的信号肽。编码的植酸酶AppA-So与其他组氨酸磷酸酶显示52%的同源性。纯化的重组肌醇六磷酸酶在55°C和pH 4.5时显示最佳活性,在pH 3.7和5.8之间显示酶活性,在pH 4.5和37°C时的比活性为1123 U / mg。在37°C的不同pH条件(pH 2.5–6.5)下孵育3小时后,AppA-So蛋白保留了其初始活性的85%以上。AppA-So活性会随着时间的流逝而保持不变,并显示出0.093 g / L的低Michaelis-Menten常数(Km)。据我们所知,这是克隆并鉴定了S. odorifera中植酸酶的第一份报告。APPA,因此,与其他知名的植酸酶的比较表明,S.香黄檀植酸酶具有最低的Km和最高稳定一段时间的活动,使得它非常适合在动物饲料行业使用。
更新日期:2021-05-22
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