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- W2056916377 abstract "In this study, we isolated a new psychrophilic bacterium, Pseudoalteromonas sp. DL-6 from marine sediments, which grew well on chitin-containing plates at 4 °C. One endo-type chitinase gene, chiA, was cloned from the genomic DNA of this bacterium and heterologously expressed in Escherichia coli BL21 (DE3). ChiA showed very high catalytic activity, even at 4 °C, and exhibited maximal activity on a chitinous substrate at pH 8.0 and 20 °C. Kinetic studies indicated that ChiA has a greater catalytic efficiency on 4-methylumbelliferyl-β-d-N,N′,N″-triacetylchitotriose[4-MU(GlcNAc)3] than on 4-methylumbelliferyl-β-d-N,N′-diacetylchitobioside[4-MU(GlcNAc)2]. Electrospray ionisation mass spectrometry (ESI-MS) analysis showed that the hydrolysis products of powdered chitin after ChiA digestion consisted of a series of chitin oligomers with different degrees of polymerisation. The ChiA mode of action was also examined using (GlcNAc)2–6 as a substrate, and the results suggested that ChiA is a non-processive endo-type chitinase." @default.
- W2056916377 created "2016-06-24" @default.
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- W2056916377 date "2014-09-01" @default.
- W2056916377 modified "2023-10-17" @default.
- W2056916377 title "Characterisation of a chitinase from Pseudoalteromonas sp. DL-6, a marine psychrophilic bacterium" @default.
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- W2056916377 doi "https://doi.org/10.1016/j.ijbiomac.2014.07.033" @default.
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