Abstract
Most biobutanol-producing Clostridium strains are unable to ferment polysaccharides such as cellulose and xylan due to the lack of hydrolyzing enzymes. In this study, we show that Clostridium beijerinckii G117, a newly isolated biobutanol-producing strain, expresses xylanase enzyme in the presence of 1 % beechwood xylan. The xylanase activity in the medium containing actively growing culture and 1 % of beechwood xylan can reach up to 2.66 U/ml after 14 h of fermentation. Using salting-out and size-exclusion chromatography, we purify the crude xylanase by 8.7-fold from the supernatant with a yield of 32.2 %. This purified xylanase has a molecular weight of 22.6 kDa, making it one of the smallest reported clostridial xylanases. Conserved domain analysis reveals that the xylanase belongs to glycoside hydrolase family 11 (GH11) but lacks a carbohydrate binding domain. When beechwood xylan is used as substrate for the xylanase, majority of the products are xylo-oligosaccharide (~98 %), suggesting that this is an endo-1,4-β-xylanase.
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Acknowledgments
This work was supported by the Singapore National Research Foundation (NRF) under grant NRF 2009 NRF-CRP 001-039. The contributions of Dr. Wu Yirui to this work are greatly appreciated.
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Table S1
Table summarizing the purification steps of G117 xylanase from the crude enzyme to the final purified product. (DOCX 12 kb)
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Ng, C.H., He, J. & Yang, KL. Purification and Characterization of a GH11 Xylanase from Biobutanol-Producing Clostridium beijerinckii G117. Appl Biochem Biotechnol 175, 2832–2844 (2015). https://doi.org/10.1007/s12010-014-1470-5
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DOI: https://doi.org/10.1007/s12010-014-1470-5