Enzymatic production of 4-O-methyl d-glucaric acid from hardwood xylan

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-03-13
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Mcode
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Language
en
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Biotechnology for Biofuels, Volume 13, issue 1
Abstract
Background: Dicarboxylic acids offer several applications in detergent builder and biopolymer fields. One of these acids, 4-O-methyl d-glucaric acid, could potentially be produced from glucuronoxylans, which are a comparatively underused fraction of wood and agricultural biorefineries. Results: Accordingly, an enzymatic pathway was developed that combines AxyAgu115A, a GH115 α-glucuronidase from Amphibacillus xylanus, and GOOX, an AA7 gluco-oligosaccharide oxidase from Sarocladium strictum, to produce this bio-based chemical from glucuronoxylan. AxyAgu115A was able to release almost all 4-O-methyl d-glucuronic acid from glucuronoxylan while a GOOX variant, GOOX-Y300A, could convert 4-O-methyl d-glucuronic acid to the corresponding glucaric acid at a yield of 62%. Both enzymes worked effectively at alkaline conditions that increase xylan solubility. Given the sensitivity of AxyAgu115A to hydrogen peroxide and optimal performance of GOOX-Y300A at substrate concentrations above 20 mM, the two-step enzyme pathwaywas demonstrated as a sequential, one-pot reaction. Additionally, the resulting xylan was easily recovered from the one-pot reaction, and it was enzymatically hydrolysable. Conclusions: The pathway in this study requires only two enzymes while avoiding a supplementation of costly cofactors. This cell-free approach provides a new strategy to make use of the underutilized hemicellulose stream from wood and agricultural biorefineries.
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Keywords
4-O-Methyl d-glucaric acid, AA7, Biorefinery, GH115, Hemicellulose, Xylan
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Citation
Vuong , T V & Master , E R 2020 , ' Enzymatic production of 4-O-methyl d-glucaric acid from hardwood xylan ' , Biotechnology for Biofuels , vol. 13 , no. 1 , 51 . https://doi.org/10.1186/s13068-020-01691-2