Chitin disaccharide deacetylase (, chitobiose amidohydolase, COD, chitin oligosaccharide deacetylase, chitin oligosaccharide amidohydolase) is an enzyme characterised from Vibrio species with systematic name 2-(acetylamino)-4-O-(2-(acetylamino)-2-deoxy-beta-D-glucopyranosyl)-2-deoxy-D-glucopyranose acetylhydrolase. It catalyses the hydrolysis of one of the two acetyl groups in N,N'-diacetylchitobiose to give N-acetylchitobiose and acetic acid.
An alternative name for the product is N-acetyl-β-D-glucosaminyl-(1->4)-D-glucosamine. Both it and the substrate are types of chitobiose, sugar components of cell walls with disaccharide structure. Unlike the related chitin deacetylase, this enzyme is specific for disaccarides and trisaccharides.
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