期刊
CARBOHYDRATE POLYMERS
卷 174, 期 -, 页码 1121-1128出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.07.001
关键词
Chitosan; Chitosan hydrolase; Substrate specificity; Enzymatic fingerprinting; Mass spectrometry
资金
- European Commission's Sixth Framework Programme [13882]
- Seventh Framework Programme [222628]
- Deutsche Forschungsgemeinschaft [GRK 1549]
- Bundesministerium fur Bildung und Forschung [0315543A]
The biological activities of partially acetylated chitosan oligosaccharides (paCOS) depend on their degree of polymerization (DP), fraction of acetylation (F-A), and potentially their pattern of acetylation (P-A). Therefore, analyzing structure-function relationships require fully defined paCOS, but these are currently unavailable. A promising approach for obtaining at least partially defined paCOS is using chitosanolytic enzymes. Here we purified and characterized a novel chitosan-hydrolyzing enzyme from the fungus Alternaria alternata possessing an absolute cleavage specificity, yielding fully defined paCOS. It cleaves specifically after GlcN-GlcNAc pairs and is most active towards moderately acetylated chitosans, but shows no activity against fully acetylated or fully deacetylated substrates. These unique properties match neither those of chitinases nor chitosanases. Therefore, the enzyme represents the first member of a new class of chitosanolytic enzymes that will allow for the production of fully defined paCOS. Additionally, it represents a highly valuable tool for fingerprinting analyses of chitosan polymers. (C) 2017 Elsevier Ltd. All rights reserved.
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