Abstract:
:The xylanases with high specific activity and resistance to harsh conditions are of high practical value for biomass utilization. In the present study, two new GH11 xylanase genes, MYCTH_56237 and MYCTH_49824, have been cloned from thermophilic fungus Myceliophthora thermophila and expressed in Pichia pastoris. The specific activities of purified xylanases reach approximately 1,533.7 and 1,412.5 U/mg, respectively. Based on multiple template-based homology modeling, the structures of their catalytic domains are predicted. Enzyme activity was more effective in 7.5 L fermentor, yielding 2,010.4 and 2,004.2 U/mL, respectively. Both enzymes exhibit optimal activity at 60°C with pH of 6.0 and 7.0, respectively. Their activities are not affected by EDTA and an array of metal ions. The kinetic constants have been determined for MYCTH_56237 (K m = 8.80 mg/mL, V max = 2,380 U/mg) and MYCTH_49824 (K m = 5.67 mg/mL, V max = 1,750 U/mg). More importantly, both xylanases significantly cooperate with the commercial cellulase Celluclast 1.5 L in terms of the saccharification efficiency. All these biochemical properties of the xylanases offer practical potential for future applications.
journal_name
Front Microbioljournal_title
Frontiers in microbiologyauthors
Basit A,Liu J,Miao T,Zheng F,Rahim K,Lou H,Jiang Wdoi
10.3389/fmicb.2018.00233subject
Has Abstractpub_date
2018-02-14 00:00:00pages
233issn
1664-302Xjournal_volume
9pub_type
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