Improvement in the thermostability of a type A feruloyl esterase, AuFaeA, from Aspergillus usamii by iterative saturation mutagenesis

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• 作者：Xin Yin ; Jian-Fang Li ; Chun-Juan Wang ; Die Hu…
• 关键词：Feruloyl esterase ; Aspergillus usamii ; Thermostability ; Iterative saturation mutagenesis
• 刊名：Applied Microbiology and Biotechnology
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：99
• 期：23
• 页码：10047-10056
• 全文大小：1,785 KB
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• 作者单位：Xin Yin (1)
  Jian-Fang Li (2)
  Chun-Juan Wang (2)
  Die Hu (1)
  Qin Wu (1)
  Ying Gu (3)
  Min-Chen Wu (3)
  
  1. Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
  2. State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
  3. Wuxi Medical School, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Microbiology
  Microbial Genetics and Genomics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0614

文摘

Feruloyl or ferulic acid esterase (Fae, EC 3.1.1.73) catalyzes the hydrolysis of ester bonds between polysaccharides and phenolic acid compounds in xylan side chain. In this study, the thermostability of a type A feruloyl esterase (AuFaeA) from Aspergillus usamii was increased by iterative saturation mutagenesis (ISM). Two amino acids, Ser33 and Asn92, were selected for saturation mutagenesis according to the B-factors analyzed by B-FITTER software and ΔΔG values predicted by PoPMuSiC algorithm. After screening the saturation mutagenesis libraries constructed in Pichia pastoris, 15 promising variants were obtained. The best variant S33E/N92-4 (S33E/N92R) produced a T _m value of 44.5 °C, the half-lives (t _1/2) of 35 and 198 min at 55 and 50 °C, respectively, corresponding to a 4.7 °C, 2.33- and 3.96-fold improvement compared to the wild type. Additionally, the best S33 variant S33-6 (S33E) was thermostable at 50 °C with a t _1/2 of 82 min, which was 32 min longer than that of the wild type. All the screened S33E/N92 variants were more thermostable than the best S33 variant S33-6 (S33E). This work would contribute to the further studies on higher thermostability modification of type A feruloyl esterases, especially those from fungi. The thermostable feruloyl esterase variants were expected to be potential candidates for industrial application in prompting the enzymic degradation of plant biomass materials at elevated temperatures.