Cloning, Characterization, and Functional Expression of a Thermostable Type B Feruloyl Esterase from Thermophilic Thielavia Terrestris
Abstract
Feruloyl esterases (FAEs) have great potential applications in paper and breeding industry. A new thermo-stable feruloyl esterase gene, TtfaeB was identified from the thermophilic fungus Thielavia terrestris h408. Deduced protein sequence shares the identity of 67% with FAEB from Neurospora crassa. The expression vector pPIC9K-TtfaeB was successfully constructed and electro-transformed into GS115 strain of Pichia pastoris. One transformant with high feruloyl esterase yield was obtained through plate screening and named TtFAEB1. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) analysis of fermentation supernatant from transformant TtFAEB1 showed a distinct protein band appearing at the position of about 35-kDa, indicating that TtfaeB gene has been successfully expressed in P. pastoris. The recombinant TtFAEB was purified by affinity chromatography and the specific activity of purified TtFAEB was 6.06 ± 0.72 U/mg. The optimal temperature and pH for purified recombinant TtFAEB was 60 °C and 7.0, respectively. TtFAEB was thermostable, retaining 96.89 and 84.16% of the maximum activity after being treated for 1 h at 50 °C and 60 °C, respectively. Additionally, the enzyme was stable in the pH range 4.5–8.0. The homology model of TtFAEB showed that it consists of a single domain adopting a typical α/β-hydrolase fold and contains a catalytic triad formed by Ser117, Asp201, and His260. TtFAEB in association with xylanase from Trichoderma reesei could release 77.1% of FA from destarched wheat bran. The present results indicated that the recombinant TtFAEB with excellent enzymatic properties is a promising candidate for potential applications in biomass deconstruction and biorefinery.
Key words
Feruloyl esterase Thermostable Thielavia terrestris Heterologous expressionNotes
Funding Information
This study received financial support from National Natural Science Foundation of China (Grant No. 31570118 and 31800116), Shandong Provincial Natural Science Foundation, China (Grant No. ZR2017MC039 and ZR2015CM029).
Conflict of Interest
The authors declare that they have no conflict of interest.
Supplementary material
References
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