Effect of expression of additional catalytic domain on characteristics of Xylanase Z of Clostridium thermocellum

Biologia - Tập 74 - Trang 1395-1403 - 2019
Muhammad Imran Mahmood Khan1, Muddassar Zafar2, Zahid Anwar2, Muhammad Imran3
1Department of Biochemistry, Hazara University, Mansehra, Pakistan
2Department of Biochemistry and Biotechnology, University of Gujrat, Gujrat, Pakistan
3Institute of Biochemistry and Biotechnology, University of Veterinary and Animal Sciences (UVAS), Lahore, Pakistan

Tóm tắt

Xylanase Z (XynZ) is a prime part of cellulosome of Clostridium thermocellum. The several domains of the cellulosome complexes are frequently tethered to one another by intrinsically messy regions. This is multidomain xylanase comprising of N-terminus feruloyl esterase followed by substrate binding, dockerin and the catalytic domains. This study design was established to check the expression, activities and other characteristics of different variants of Xylanase Z produced by the C-terminal (XynZ-CB), N-terminal (XynZ-BC) and both terminals (XynZ-BCB) binding domain to catalytic domain in different arrangements. XynZ variants of C. thermocellum with binding domain committed with catalytic domain of C-terminal (XynZ-CB) and N-terminal (XynZ-BC) and both terminals (XynZ-BCB) binding domain and one with catalytic domain at both terminals of the binding domain (XynZ-CBC) were checked in E. coli in different levels like 15, 30, 30, and 33% of cell proteins, respectively. The specific xylanase Z activities of XynZ-CB, XynZ BC, XynZ-BCB and XynZ-BCB were 72, 68, 67 and 200 U mg−1, though their equimolar basis activities were 4176, 3944, 5092 and 19,200 U μM−1 compared to xylan (birchwood). The over-all activities of XynZ-CB, XynZ-BC, XynZ-BCB and XynZ-CBC produced in fermentation culture were 3678, 3579, 3800 and 5400 U L−1 OD600−1, respectively. The results showed that overall yield of XynZ-C remained manifold higher than all other variants due to combined effect of its specific activity and expression level while the activity of variant XynZ-CBC was increased four folds on equimolar basis as compared to its native form. The fruit saccharification increased with the treatment of xylanase and cellulase.

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