Synergistic hydrolysis of xylan using novel xylanases, β-xylosidases, and an α-l-arabinofuranosidase from Geobacillus thermodenitrificans NG80-2
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Lignocellulosic biomass from various types of wood has become a renewable resource for production of biofuels and biobased chemicals. Because xylan is the major component of wood hemicelluloses, highly efficient enzymes to enhance xylan hydrolysis can improve the use of lignocellulosic biomass. In this study, a xylanolytic gene cluster was identified from the crude oil-degrading thermophilic strain Geobacillus thermodenitrificans NG80-2. The enzymes involved in xylan hydrolysis, which include two xylanases (XynA1, XynA2), three β-xylosidases (XynB1, XynB2, XynB3), and one α-l-arabinofuranosidase (AbfA), have many unique features, such as high pH tolerance, high thermostability, and a broad substrate range. The three β-xylosidases were highly resistant to inhibition by product (xylose) accumulation. Moreover, the combination of xylanase, β-xylosidase, and α-l-arabinofuranosidase exhibited the largest synergistic action on xylan degradation (XynA2, XynB1, and AbfA on oat spelt or beechwood xylan; XynA2, XynB3, and AbfA on birchwood xylan). We have demonstrated that the proposed enzymatic cocktail almost completely converts complex xylan to xylose and arabinofuranose and has great potential for use in the conversion of plant biomass into biofuels and biochemicals.
KeywordsXylan Xylanase β-Xylosidase α-l-Arabinofuranosidase Synergistic action Geobacillus thermodenitrificans NG80-2
This research was financially supported by the National Basic Research Program of China (973 Program) (Nos. 2013CB733904, 2012CB721001, and 2012CB721101), the National Natural Science Foundation of China (Nos. 31270133, 31470194, 31371259, 81471904, 31270003 and 31400081), the Tianjin Research Program of Application Foundation and Advanced Technology (15JCQNJC09700) and the Fundamental Research Funds for the Central Universities (No. 65141028).
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Conflict of interest
The authors declare that they have no conflict of interest.
This article does not contain any studies with human participants or animals.
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