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• W3134823912 abstract "Partially acetylated chito-oligosaccharides (paCOSs) are bioactive compounds with potential medical applications. Their biological activities are largely dependent on their structural properties, in particular their degree of polymerization (DP) and the position of the acetyl groups along the glycan chain. The production of structurally defined paCOSs in a purified form is highly desirable to better understand the structure/bioactivity relationship of these oligosaccharides. Here, we describe a newly discovered chitinase from Paenibacillus pabuli (PpChi) and demonstrate by mass spectrometry that it essentially produces paCOSs with a DP of three and four that carry a single N-acetylation at their reducing end. We propose that this specific composition of glucosamine (GlcN) and N-acetylglucosamine (GlcNAc) residues, as in GlcN(n)GlcNAc1, is due to a subsite specificity toward GlcN residues at the −2, −3, and −4 positions of the partially acetylated chitosan substrates. In addition, the enzyme is stable, as evidenced by its long shelf life, and active over a large temperature range, which is of high interest for potential use in industrial processes. It exhibits a kcat of 67.2 s–1 on partially acetylated chitosan substrates. When PpChi was used in combination with a recently discovered fungal auxilary activity (AA11) oxidase, a sixfold increase in the release of oligosaccharides from the lobster shell was measured. PpChi represents an attractive biocatalyst for the green production of highly valuable paCOSs with a well-defined structure and the expansion of the relatively small library of chito-oligosaccharides currently available." @default.
• W3134823912 created "2021-03-15" @default.
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• W3134823912 date "2021-03-10" @default.
• W3134823912 modified "2023-10-01" @default.
• W3134823912 title "Production of Structurally Defined Chito-Oligosaccharides with a Single <i>N</i>-Acetylation at Their Reducing End Using a Newly Discovered Chitinase from <i>Paenibacillus pabuli</i>" @default.
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• W3134823912 doi "https://doi.org/10.1021/acs.jafc.0c06804" @default.
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• W3134823912 hasPublicationYear "2021" @default.
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