Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5511965 | International Journal of Biological Macromolecules | 2017 | 7 Pages |
Abstract
Protein engineering was performed by N-terminal region replacement and site-directed mutagenesis in the cord of a xylanase (Srxyn) from Streptomyce rochei L10904 to improve its catalytic characteristics. Three mutants SrxynF, SrxynM and SrxynFM displayed 2.1-fold, 3.2-fold and 5.3-fold higher specific activities than that of Srxyn, respectively. Moreover, all of the mutants showed greater substrate affinity and kcat/Km than the native Srxyn. In addition, the enzymes showed improved hydrolysis characteristics, of which the most noteworthy is the enhanced ability of producing xylobiose (X2) and xylotriose (X3) from polymeric substrates. The engineered xylanases have greater potential for applications in oligosaccharide preparation industry.
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Authors
Qin Li, Baoguo Sun, Huiyong Jia, Jie Hou, Ran Yang, Ke Xiong, Youqiang Xu, Xiuting Li,