ArticleApplied microbiology and biotechnology2024
Characterization of a novel GH30 non-specific endoxylanase AcXyn30B from Acetivibrio clariflavus.
Article in Applied microbiology and biotechnology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Crystal structure of endo-β-1,6-galactanase from Streptomyces avermitilis.Acta crystallographica. Section D, Structural biology · 2026Article
- Cellulolytic and hemicellulolytic capacity of Acetivibrio clariflavus.Applied microbiology and biotechnology · 2025Review
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Abstract
The xylanolytic enzymes Clocl_1795 and Clocl_2746 from glycoside hydrolase (GH) family 30 are highly abundant in the hemicellulolytic system of Acetivibrio clariflavus (Hungateiclostridium, Clostridium clariflavum). Clocl_1795 has been shown to be a xylobiohydrolase AcXbh30A releasing xylobiose from the non-reducing end of xylan and xylooligosaccharides. In this work, biochemical characterization of Clocl_2746 is presented. The protein, designated AcXyn30B, shows low sequence similarity to other GH30 members and phylogenetic analysis revealed that AcXyn30B and related proteins form a separate clade that is proposed to be a new subfamily GH30_12. AcXyn30B exhibits similar specific activity on glucuronoxylan, arabinoxylan, and aryl glycosides of linear xylooligosaccharides suggesting that it is a non-specific xylanase. From polymeric substrates, it releases the fragments of degrees of polymerization (DP) 2-6. Hydrolysis of different xylooligosaccharides indicates that AcXyn30B requires at least four occupied catalytic subsites for effective cleavage. The ability of the enzyme to hydrolyze a wide range of substrates is interesting for biotechnological applications. In addition to subfamilies GH30_7, GH30_8, and GH30_10, the newly proposed subfamily GH30_12 further widens the spectrum of GH30 subfamilies containing xylanolytic enzymes. KEY POINTS: Bacterial GH30 endoxylanase from A. clariflavus (AcXyn30B) has been characterized AcXyn30B is non-specific xylanase hydrolyzing various xylans and xylooligosaccharides Phylogenetic analysis placed AcXyn30B in a new GH30_12 subfamily.
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