A novel GH30 xylobiohydrolase from Acremonium alcalophilum releasing xylobiose from the non-reducing end

•A putative Acremonium alcalophilum GH30_7 xylanase gene was cloned and expressed.•AaXyn30A is active on different xylans and linear xylooligosaccharides.•AaXyn30A releases xylobiose from the non-reducing end of the substrates.•Xylobiohydrolase activity makes AaXyn30A a promising tool for xylobiose...

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Veröffentlicht in:Enzyme and microbial technology 2020-03, Vol.134, p.109484-109484, Article 109484
Hauptverfasser: Šuchová, Katarína, Puchart, Vladimír, Spodsberg, Nikolaj, Mørkeberg Krogh, Kristian B.R., Biely, Peter
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Sprache:eng
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Zusammenfassung:•A putative Acremonium alcalophilum GH30_7 xylanase gene was cloned and expressed.•AaXyn30A is active on different xylans and linear xylooligosaccharides.•AaXyn30A releases xylobiose from the non-reducing end of the substrates.•Xylobiohydrolase activity makes AaXyn30A a promising tool for xylobiose production. Xylanases of the GH30 family are grouped to subfamilies GH30-7 and GH30-8. The GH30-8 members are of bacterial origin and well characterized, while the GH30-7 members are from fungal sources and their properties are quite diverse. Here, a heterologous expression and characterization of the GH30-7 xylanase AaXyn30A from a cellulolytic fungus Acremonium alcalophilum is reported. From various polymeric and oligomeric substrates AaXyn30A generates xylobiose as the main product. It was proven that xylobiose is released from the non-reducing end of all tested substrates, thus the enzyme behaves as a typical non-reducing-end acting xylobiohydrolase. AaXyn30A is active on different types of xylan, exhibiting the highest activity on rhodymenan (linear β-1,3-β-1,4-xylan) from which also an isomeric xylotriose Xyl-β-1,3-Xyl-β-1,4-Xyl is formed. Production of xylobiose from glucuronoxylan is at later stage accompanied by a release of aldouronic acids differing from those liberated by the bacterial GH30-8 glucuronoxylanases.
ISSN:0141-0229
1879-0909
DOI:10.1016/j.enzmictec.2019.109484